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2010-02-04 - We are adopting a new airworthiness directive (AD) for certain Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD requires replacing the engine fuel shutoff valves for the left and right main tanks. This AD results from a report of a failed engine start, which was caused by an internally fractured engine fuel shutoff valve. We are issuing this AD to prevent the failure of the valve in the closed position, open position, or partially open position, which could result in engine fuel flow problems and possible uncontrolled fuel leak or fire.
2010-01-09 - We are adopting a new airworthiness directive (AD) for certain Model 737-300, -400, and -500 series airplanes. This AD requires repetitive external non-destructive inspections to detect cracks in the fuselage skin along the chem-mill step at stringers S-1 and S-2 right, between station (STA) 827 and STA 847, and repair if necessary. This AD results from a report of a hole in the fuselage skin common to stringer S-1 and S-2 left, between STA 827 and STA 847 on an airplane that diverted to an alternate airport due to cabin depressurization and subsequent deployment of the oxygen masks. We are issuing this AD to detect and correct fatigue cracking of the fuselage skin panels at the chem-milled steps, which could result in sudden fracture and failure of the fuselage skin panels, and consequent rapid decompression of the airplane.
2010-01-08 - We are adopting a new airworthiness directive (AD) for certain Model 737-600, -700, and -800 series airplanes. This AD requires an inspection of the free flange, vertical web, and radius between the free flange and vertical web of the lower stringers of the wing center section for drill starts, and applicable related investigative and corrective actions. This AD results from drill starts being found on the free flange of the lower stringers of the wing center section during a quality assurance inspection at the final assembly plant. We are issuing this AD to prevent cracks from propagating from drill starts in the free flange, vertical web, and radius between the free flange and vertical web of the lower stringers of the wing center section lower stringers, which could cause a loss of structural integrity of the wing center section and may result in a fuel leak.
2008-10-10 R1 - The FAA is revising an existing airworthiness directive (AD), which applies to certain Model 737-600, -700, -700C, -800, and -900 series airplanes. That AD currently requires revising the Airworthiness Limitations (AWLs) section of the Instructions for Continued Airworthiness by incorporating new limitations for fuel tank systems to satisfy Special Federal Aviation Regulation No. 88 requirements. That AD also requires an initial inspection to phase in certain repetitive AWL inspections, and repair if necessary. This AD clarifies the intended effect of the AD on spare and onairplane fuel tank system components. This AD results from a design review of the fuel tank systems. We are issuing this AD to prevent the potential for ignition sources inside fuel tanks caused by latent failures, alterations, repairs, or maintenance actions, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.
2009-26-03 - The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 737-300, -400, -500, -600, -700, -700C, -800, and -900, and 747-400 series airplanes; and Model 757, 767, and 777 airplanes. This AD requires modifying the static inverter by replacing resistor R170 with a new resistor and relocating the new resistor. This AD results from evaluation of the carbon resistor, which revealed a failure mode that can cause the resistor to ignite, involving adjacent capacitors as well. We are issuing this AD to prevent a standby static inverter from overheating, which could result in smoke in the flight deck and cabin and loss of the electrical standby power system.
2009-26-04 - The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 737-600, -700, -700C, -800, and -900 series airplanes. This AD requires repetitive lubrication of the left and right main landing gear (MLG) forward trunnion pins; and an inspection for discrepancies of the transition radius, lead-in chamfer, and cross-bolt bore of the MLG forward trunnion pins, and repair or replacement if necessary. Doing the applicable inspections and repairs/replacements, or overhauling the trunnion pins ends the repetitive lubrication requirements of this AD. For airplanes on which a certain repair is done, this AD requires repetitive inspections for discrepancies of the transition radius. This AD results from a report that the protective finishes on the forward trunnion pins for the left and right MLG might have been damaged during final assembly. We are issuing this AD to prevent cracking of the forward trunnion pin, which could result in fracture of the pin and consequent collapse of the MLG.
2009-24-07 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 600, -700, -700C, and -800 series airplanes. This AD requires repetitive lubrications of the right and left main landing gear (MLG) forward trunnion pins. This AD also requires an inspection for discrepancies of the transition radius of the MLG forward trunnion pins, and corrective actions if necessary. For certain airplanes, this AD also requires repetitive detailed inspections for discrepancies (including finish damage, corrosion, pitting, and base metal scratches) of the transition radius of the left and right MLG trunnion pins, and corrective action if necessary. Replacing or overhauling the trunnion pins terminates the actions required by this AD. This AD results from a report that the protective finishes on the forward trunnion pins for the left and right MLG might have been damaged during final assembly. We are issuing this AD to prevent stress corrosion cracking of the forward trunnion pins, which could result in fracture of the pins and consequent collapse of the MLG.
2009-23-10 - The FAA is superseding an existing airworthiness directive (AD) that applies to all Boeing Model 737-300, -400, and -500 series airplanes. The existing AD currently requires inspecting to determine if certain carriage spindles are installed, repetitive inspections for corrosion and indications of corrosion on affected carriage spindles, and if necessary, related investigative and corrective actions. The existing AD also provides optional terminating action. For certain airplanes, this new AD would reinstate the requirements of the existing AD. This AD results from the exclusion of certain carriage spindles from the requirements of the existing AD, and additional reports of corrosion found on carriage spindles that are located on the outboard trailing edge flaps. We are issuing this AD to detect and correct corrosion of the carriage spindle, which could result in fracture. Fracture of both the inboard and outboard carriage spindles, in the forward ends through the large diameters, on a flap, could adversely affect the airplane's continued safe flight and landing.
2009-21-01 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 300 and 737-400 series airplanes. This AD requires repetitive inspections to detect cracking of the aft fuselage skin, and related investigative/corrective actions if necessary. This AD results from reports of cracks in the aft fuselage skin on both sides of the airplane. We are issuing this AD to detect and correct cracking in the aft fuselage skin along the longitudinal edges of the bonded skin doubler, which could result in reduced structural integrity of the airplane.
2009-20-11 Corrected - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 300, -400, and -500 series airplanes. This AD requires revising the maintenance program to include new fuel system limitations for airplanes modified in accordance with STC ST00127BO. This AD also requires inspections and checks of the DTSDs and corrective actions, if necessary. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent a potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapors, could result in a fuel tank fire or explosion and consequent loss of the airplane.
2009-19-02 - We are adopting a new airworthiness directive (AD) for all Boeing Model 737-600, - 700, -700C, -800, -900 and -900ER series airplanes. This AD requires repetitive testing of the rudder pedal forces or repetitive detailed inspections of the inner spring of the rudder feel and centering unit, and corrective actions if necessary. This AD also requires replacement of the spring assembly in the rudder feel and centering unit, which terminates the repetitive tests or inspections. This AD results from reports of low rudder pedal forces that were caused by a broken inner spring in the rudder feel and centering unit; a broken inner spring in conjunction with a broken outer spring would significantly reduce rudder pedal forces. We are issuing this AD to prevent reduced rudder pedal forces, which could result in increased potential for pilot-induced oscillations and reduce the ability of the flightcrew to maintain the safe flight and landing of the airplane.
2009-02-06R1 - We are revising an existing airworthiness directive (AD) that applies to certain Boeing Model 737-300, -400, and -500 series airplanes. That AD currently requires repetitive high frequency eddy current inspections for cracking of the 1.04-inch nominal diameter wire penetration hole in the frame and frame reinforcement, between stringers S-20 and S-21, on both the left and right sides of the airplane, and related investigative and corrective actions if necessary. This new AD clarifies certain compliance requirements. This AD results from reports of cracking in the frame, or in the frame and frame reinforcement, common to the 1.04-inch nominal diameter wire penetration hole intended for wire routing. We are issuing this AD to detect and correct cracking in the fuselage frames and frame reinforcements, which could reduce the structural capability of the frames to sustain limit loads, and result in cracking in the fuselage skin and subsequent rapid depressurization of the airplane.
2009-16-07 - The FAA is superseding an existing airworthiness directive (AD), which applies to certain Boeing Model 737-600, -700, -700C, -800, and -900 series airplanes. That AD currently requires replacing brackets that hold the P5 panel to the airplane structure, the standby compass bracket assembly, the generator drive and standby power module, and the air conditioning module, as applicable. The existing AD also currently requires, among other actions, inspecting for wire length and for damage of the connectors and the wire bundles, and doing applicable corrective actions if necessary. This new AD requires an additional operational test of the P5-14 panel. This AD results from a report of an electrical burning smell in the flight compartment. We are issuing this AD to prevent wire bundles from contacting the overhead dripshield panel and modules in the P5 overhead panel, which could result in electrical arcing and shorting of the electrical connector and consequent loss of several critical systems essential for safe flight; and to ensure proper operation of the passenger oxygen system. If an improperly functioning passenger oxygen system goes undetected, the passenger oxygen mask could fail to deploy and result in possible incapacitation of passengers during a depressurization event.
2009-16-14 - The FAA is superseding an existing airworthiness directive (AD) that applies to certain Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. That AD currently requires repetitive inspections of the intercostal webs, attachment clips, and stringer splice channels for cracks; and corrective action if necessary. This new AD reduces the repetitive inspection intervals from 25,000 flight cycles to 6,000 flight cycles, and expands the inspection area for Model 737-200C series airplanes to include the area aft of the forward entry door. This AD results from additional reports of fatigue cracks. We are issuing this AD to detect and correct fatigue cracking of the intercostals on the forward and aft sides of the forward entry door, which could result in loss of the forward entry door and rapid decompression of the airplane.
2009-14-04 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 100, -200, -200C, -300, -400, and -500 series airplanes. For certain airplanes, this AD requires deactivating or modifying the wiring to the outboard landing lights, until the wire bundles and electrical connectors have been replaced. For all airplanes, this AD also requires inspecting for any broken, damaged, or missing fairleads, grommets, and wires in the four electrical junction boxes of the main wheel well, and corrective actions if necessary. For certain airplanes, this AD also requires replacing certain wire bundles for the landing lights and fuel shutoff valves, and related investigative, other specified, and corrective actions if necessary. For certain airplanes, this AD also requires replacing of certain electrical connectors and backshell clamps. This AD results from reports of uncommanded engine shutdowns and burned and damaged wire bundles associated with the outboard landing lights and engine fuel shutoff valves. This AD also results from reports of damaged and missing grommets and broken and damaged fairleads in the electrical junction boxes of the main wheel well. We are issuing this AD to prevent a hot short between the outboard landing light and fuel shutoff valve circuits, which could result in an uncommanded engine shutdown. We are also issuing this AD to prevent corrosion of the electrical connectors of the wing rear spars, which could result in short circuits and consequent incorrect functioning of airplane systems needed for safe flight and landing.
2009-12-06 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 300, -400, -500, -600, -700, -700C, -800, and -900 series airplanes. This AD requires installing a new circuit breaker, relays, and wiring to allow the flightcrew to turn off electrical power to the in-flight entertainment (IFE) systems and other non-essential electrical systems through a switch in the flight compartment, and doing other specified actions. This AD results from an IFE systems review. We are issuing this AD to ensure that the flightcrew is able to turn off electrical power to IFE systems and other non-essential electrical systems through a switch in the flight compartment. The flightcrew's inability to turn off power to IFE systems and other non-essential electrical systems during a nonnormal or emergency situation could result in the inability to control smoke or fumes in the airplane flight deck or cabin.
2009-12-05 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 300, -400, and -500 series airplanes. This AD requires modifying the control power wiring of the normal supply fan and the low flow sensor for the equipment cooling system of the electronic flight instrument system (EFIS). This AD results from a report of loss of both the normal EFIS cooling supply and the indication of EFIS cooling loss due to a single failure of the battery bus, causing eventual power-down of the EFIS displays; the standby attitude indication is also powered by this battery bus. We are issuing this AD to prevent loss of all attitude indications from both the standby indicator and EFIS displays, which could decrease the ability of the flightcrew to maintain the safe flight and landing of the airplane.
2009-09-07 - We are adopting a new airworthiness directive (AD) for all Boeing Model 737-100, - 200, -200C, -300, -400, and -500 series airplanes. For all airplanes, this AD requires repetitive overhaul of the retract actuator beam of the main landing gear (MLG). For certain airplanes, this AD requires repetitive inspections for damage of the retract actuator beam, and related investigative and corrective actions if necessary. This AD results from reports of broken retract actuator beams of the MLG and the subsequent failure of the MLG to fully retract. We are issuing this AD to detect and correct broken retract actuator beams of the MLG, which could cause damage to the beam arm, hydraulic tubing, and flight control cables. Damage to the flight control cables could result in loss of control of the airplane.
2009-09-06 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 100, -200, -200C, -300, -400, and -500 series airplanes. This AD requires repetitive detailed and high frequency eddy current inspections to detect cracks of the backup intercostals and the upper sill of the forward airstair doorway, and applicable corrective actions. This AD also provides for an optional terminating action, which would eliminate the need for repetitive inspections. This AD results from a report indicating that cracks were found in the backup intercostals and upper sill web of the forward airstair doorway. We are issuing this AD to detect and correct fatigue cracking of the backup intercostals and upper sill web of the forward airstair doorway, which could result in a rapid loss of cabin pressure.
2009-07-11 - The FAA is superseding an existing airworthiness directive (AD), which applies to all Boeing Model 737-300, -400, and -500 series airplanes. That AD currently requires repetitive inspections for discrepancies of the fuselage skin under the dorsal fin assembly, and repairing if necessary. This new AD requires an inspection for any chafing or crack in the fuselage skin and abrasion resistant coating at the dorsal fin landing, an inspection for damage to the dorsal fin seals, attach clip, and seal retainer, and other specified and corrective actions as necessary. The new requirements will end the need for the existing repetitive inspections. This AD results from a report of an 18-inch crack found in the fuselage skin area under the blade seals of the nose cap of the dorsal fin due to previous wear damage, and additional reports of fuselage skin wear. We are issuing this AD to prevent discrepancies of the fuselage skin, which could result in fatigue cracking due to cabin pressurization and consequent rapid in-flight decompression of the airplane fuselage.
2009-02-06 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 300, -400, and -500 series airplanes. This AD requires repetitive high frequency eddy current inspections for cracking of the 1.04-inch nominal diameter wire penetration hole in the frame and frame reinforcement, between stringers S-20 and S-21, on both the left and right sides of the airplane, and related investigative and corrective actions if necessary. This AD results from reports of cracking in the frame, or in the frame and frame reinforcement, common to the 1.04-inch nominal diameter wire penetration hole intended for wire routing. We are issuing this AD to detect and correct cracking in the fuselage frames and frame reinforcements, which could reduce the structural capability of the frames to sustain limit loads, and result in cracking in the fuselage skin and subsequent rapid depressurization of the airplane.
2009-04-15 - The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This AD requires repetitive internal eddy current and detailed inspections to detect cracked stringer tie clips; measuring the fastener spacing and the edge margin if applicable, and doing applicable corrective and related investigative actions. As a temporary alternative to doing the actions described previously, this AD requires repetitive external general visual inspections of the skin and lap joints and repetitive external eddy current sliding probe inspections, as applicable, of the lap joints for cracks and evidence of overload resulting from cracked stringer tie clips, and applicable corrective actions if necessary. This AD results from a report of several cracked stringer tie clips. We are issuing this AD to detect and correct multiple adjacent cracked stringer tie clips and damaged skin and frames, which could lead to the skin and frame structure developing cracks and consequent decompression of the airplane.
2009-01-02 - SUMMARY: The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 737-600, -700, -700C, -800 and -900 series airplanes. This AD requires a one-time general visual inspection of frames between body station (BS) 360 and BS 907 to determine if certain support brackets of the air conditioning (A/C) outlet extrusions are installed; medium- and high-frequency eddy current inspections for cracking of the frames around the attachment holes of the subject brackets; and repair if necessary. This AD also requires installing new, improved fittings for all support brackets of the A/C outlet extrusions between BS 360 and BS 907. This AD results from numerous reports of multiple cracks in the frames around the attachment holes of certain support brackets of the A/C outlet extrusions. We are issuing this AD to prevent frame cracking, which, if not corrected, could lead to a severed frame that, combined with cracking of the skin lap splice above stringer 10, could result in rapid decompression of the airplane.
2008-24-08 - SUMMARY: We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 600, -700, -700C, -800 and -900 series airplanes. This AD requires an inspection of the escape slides for the forward and aft entry and service doors to determine the part number and service bulletin number stenciled on the escape slide girt, and modification of the escape slide assemblies. This AD also requires concurrent modification of the escape slide latch assemblies; concurrent inspection of the escape slides to determine the part number and service bulletin number stenciled on the escape slide girts, and replacement of the trigger housing on the regulator valve with an improved trigger housing if necessary; and concurrent replacement of the rod in the pilot valve regulator with a new, improved rod; as applicable. This AD results from reports that certain escape slides did not automatically inflate when deployed or after the manual inflation cable was pulled. We are issuing this AD to prevent failure of an escape slide to inflate when deployed, which could result in the slide being unusable during an emergency evacuation and consequent injury to passengers or crewmembers.
2008-24-05 - SUMMARY: We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 400, -500, -600, -700, -700C, -800, and -900 series airplanes. This AD requires an inspection to determine the part and serial numbers of the windshield wiper motors for the pilot's and first officer's windshields, and doing applicable corrective actions. This AD results from two reports that the left and right windshield wipers stopped working in flight. We are issuing this AD to prevent failure of the windshield wipers in wet weather, which could result in decreased visibility for the flightcrew.
2008-24-51-Emergency - BACKGROUND: We received a report of failure of the left-hand fuel pump of the center wing tank (CWT) to shut off after being selected “OFF” by the flightcrew during flight on a Boeing Model 737-700 airplane. Subsequent to that report, the failure was found on two additional airplanes. Information indicates that the autoshutoff system appears to function normally; however, when the flightcrew manually turns off the CWT pump switches, that action turns off the right-hand pump, but re-energizes the left-hand pump due to incorrect wiring. The low-pressure lights turn off, incorrectly indicating to the flightcrew that power to both pumps has been removed. The failure condition results in continual running of the left-hand fuel pump without indication to the flightcrew, which could lead to localized overheating of parts inside the fuel pump, and which could produce an ignition source inside the fuel tank.
Investigation revealed that incorrect wiring could occur on airplanes on which an autoshutoff system was installed in accordance with Boeing Alert Service Bulletin 737-28A1206. Functional tests conducted in accordance with that service bulletin are not adequate to detect the incorrect wiring condition.
We approved installation of the autoshutoff system as an alternative method of compliance to AD 2002-24-51, amendment 39-12992 (68 FR 10, January 2, 2003). That AD was issued to address reports indicating that two fuel tank pumps showed evidence of extreme localized overheating of parts in the priming and vapor pump section of the fuel pump. That AD required revising the airplane flight manual (AFM) to require the flightcrew to maintain certain minimal fuel levels in the center fuel tanks.
2008-13-12-R1 - SUMMARY: The FAA is revising an existing airworthiness directive (AD) that applies to certain Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. That AD currently requires various repetitive inspections for cracking of the upper frame to side frame splice of the fuselage, and other specified and corrective actions if necessary. That AD also provides for an optional preventive modification, which terminates the repetitive inspections. This new AD adds an optional terminating action that was inadvertently omitted from that AD. This AD results from a report that the upper frame of the fuselage was severed between stringers S-13L and S-14L at station 747, and the adjacent frame at station 767 had a 1.3-inch-long crack at the same stringer location. We are issuing this AD to detect and correct fatigue cracking of the upper frame to side frame splice of the fuselage, which could result in reduced structural integrity of the frame and adjacent lap joint. This reduced structural integrity can increase loading in the fuselage skin, which will accelerate skin crack growth and result in decompression of the airplane.
2008-23-09 - SUMMARY: We are adopting a new airworthiness directive (AD) for certain Boeing transport category airplanes. This AD requires replacing any insulation blanket constructed of polyethyleneteraphthalate (PET) film, ORCON Orcofilm[reg] AN-26 (hereafter ''AN-26''), with a new insulation blanket. This AD results from reports of in-flight and ground fires on certain airplanes manufactured with insulation blankets covered with AN-26, which may contribute to the spread of a fire when ignition occurs from sources such as electrical arcing or sparking. We are issuing this AD to ensure that insulation blankets constructed of AN-26 are removed from the fuselage. Such insulation blankets could ignite and propagate a fire that is the result of electrical arcing or sparking.
2008-23-07 - SUMMARY: We are adopting a new airworthiness directive (AD) for all Boeing Model 737 airplanes. This AD requires revising the airplane flight manual to include a new flightcrew briefing that must be done before the first flight of the day and following any change in flightcrew members, and to advise the flightcrew of this additional briefing. This AD results from continuing reports that flightcrews have failed to recognize and react properly to the cabin altitude warning horn. We are issuing this AD to prevent failure of the flightcrew to recognize and react properly to a valid cabin altitude warning horn, which could result in incapacitation of the flightcrew due to hypoxia (lack of oxygen in body) and consequent loss of airplane control.
2008-22-01 - We are adopting a new airworthiness directive (AD) for various transport category airplanes. This AD requires deactivation of PATS Aircraft, LLC, auxiliary fuel tanks. This AD results from fuel system reviews conducted by the manufacturer, which identified unsafe conditions for which the manufacturer has not provided corrective actions. We are issuing this AD to prevent the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapors, could result in fuel tank explosions and consequent loss of the airplane.
2008-17-13 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 100, -200, -200C, -300, -400, and -500 series airplanes. This AD requires replacing the existing straight-to-90-degree hose assembly for the Lavatory ''A'' water supply. The replacement is a new straight hose assembly and a separate 90-degree elbow fitting. This AD results from a report of a separated hose assembly for the passenger water system. We are issuing this AD to prevent a water leak into the flight deck ceiling, which could result in an electrical short and possible loss of several functions essential to safe flight.
2008-19-03 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 300, -400, and -500 series airplanes. This AD requires repetitive external detailed inspections or nondestructive inspections to detect cracks in the fuselage skin along the chem-mill steps at stringers S-1 and S-2R, between station (STA) 400 and STA 460, and repair if necessary. This AD results from reports of cracks in the fuselage skin common to stringer S-1 and between STA 400 and STA 460. We are issuing this AD to detect and correct fatigue cracking of the fuselage skin panels at the chemmill steps, which could result in sudden fracture and failure of the fuselage skin panels, and consequent rapid decompression of the airplane.
2008-17-15 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 600, -700, -800, and -900 series airplanes. This AD requires installing hot short protector (HSP) support brackets and equipment for the fuel quantity indicating system (FQIS) fuel densitometer and other specified actions as applicable. This AD also requires revising the Airworthiness Limitations (AWLs) section of the Instructions for Continued Airworthiness to incorporate AWL No. 28-AWL- 07. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent the center tank fuel densitometer from overheating and becoming a potential ignition source inside the center fuel tank, which, in combination with flammable fuel vapors, could result in a center fuel tank explosion and consequent loss of the airplane.
2008-17-03 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 100, -200, -200C, -300, -400, and -500 series airplanes. This AD requires repetitive inspections to detect cracking of the body station 303.9 frame, and corrective action if necessary. This AD also provides for optional terminating action for the repetitive inspections. This AD results from reports of cracks found at the cutout in the web of body station frame 303.9 inboard of stringer 16L. We are issuing this AD to detect and correct such cracking, which could prevent the left forward entry door from sealing correctly, and could cause in-flight decompression of the airplane.
2008-16-13 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 600, -700, -700C, -800, -900, and -900ER series airplanes. This AD requires replacing the pushrods for the left and right elevator tab control mechanisms with new, improved pushrods. This AD results from a report of a rod end fracture on a rudder power control unit (PCU) control rod, which is similar to the ones used for the elevator tab pushrods. Analysis revealed that the fractured rod end had an incorrect hardness, which had probably occurred during the manufacture of the control rod. We are issuing this AD to prevent fracture of the elevator tab pushrod ends, which could result in excessive in-flight vibrations of the elevator tab, possible loss of the elevator tab, and consequent loss of controllability of the airplane.
2008-15-05 - We are adopting a new airworthiness directive (AD) for all Boeing Model 737-300, - 400, and -500 series airplanes. This AD requires inspecting to determine if certain carriage spindles are installed, repetitive inspections for corrosion and indications of corrosion on affected carriage spindles, and if necessary, related investigative action and corrective action. This AD also provides optional terminating action. This AD results from a report of corrosion found on carriage spindles that are located on the outboard trailing edge flaps. We are issuing this AD to detect and correct corrosion of the carriage spindle, which could result in fracture. Fracture of both the inboard and outboard carriage spindles, in the forward ends through the large diameters, on a flap, could adversely affect the airplane's continued safe flight and landing.
2008-13-25 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 300 and -400 series airplanes. This AD requires testing and inspecting a certain web panel of the main wheel well pressure deck to determine the material type and thickness; and related investigative and corrective actions if necessary. This AD results from several reports indicating that cracks ranging from 0.8 to 8.0 inches long were found on a certain web panel of the main wheel well pressure deck. We are issuing this AD to prevent fatigue cracking in the web panel of the main wheel well pressure deck, which could result in venting and consequent decompression of the airplane.
2008-13-12 - We are adopting a new airworthiness directive (AD) for certain Boeing Model 737- 100, -200, -200C, -300, -400, and -500 series airplanes. This AD requires various repetitive inspections for cracking of the upper frame to side frame splice of the fuselage, and other specified and corrective actions if necessary. This AD also provides for an optional preventive modification, which terminates the repetitive inspections. This AD results from a report that the upper frame of the fuselage was severed between stringers S-13L and S-14L at station 747, and the adjacent frame at station 767 had a 1.3-inch-long crack at the same stringer location. We are issuing this AD to detect and correct fatigue cracking of the upper frame to side frame splice of the fuselage, which could result in reduced structural integrity of the frame and adjacent lap joint. This reduced structural integrity can increase loading in the fuselage skin, which will accelerate skin crack growth and result in decompression of the airplane.
2008-12-04 - We are
adopting a new airworthiness directive (AD) for certain Boeing Model 737- 600,
-700, -700C, -800, and -900 series airplanes. This AD requires various
repetitive inspections to detect cracks along the chemically milled steps of the
fuselage skin or missing or loose fasteners in the area of the preventative
modification or repairs, replacement of the time-limited repair with the
permanent repair if applicable, and applicable corrective actions if necessary,
which would end certain repetitive inspections. This AD results from a fatigue
test that revealed numerous cracks in the upper skin panel at the chemically
milled step above the lap joint. We are issuing this AD to detect and correct
such fatigue-related cracks, which could result in the crack tips continuing to
turn and grow to the point where the skin bay flaps open, causing decompression
of the airplane.
2008-12-03 - We are
adopting a new airworthiness directive (AD) for various transport category
airplanes. This AD requires deactivation of Rogerson Aircraft Corporation
auxiliary fuel tanks. This AD results from fuel system reviews conducted by the
manufacturer, which identified potential unsafe conditions for which the
manufacturer has not provided corrective actions. We are issuing this AD to
prevent the potential of ignition sources inside fuel tanks, which, in
combination with flammable fuel vapors, could result in fuel tank explosions and
consequent loss of the airplane.
2008-11-08 - We are adopting a new
airworthiness directive (AD) for all Boeing Model 737-600, - 700, -700C, -800,
-900, and -900ER series airplanes. This AD requires repetitive inspections for
any cracking of or damage to the left side and right side flight deck No. 2, No.
4, and No. 5 windows, as necessary, and corrective actions if necessary. This AD
results from reports of in-flight departure and separation of the flight deck
windows. We are issuing this AD to detect and correct cracking in the vinyl
interlayer or damage to the structural inner glass panes of the flight deck No.
2, No. 4, and No. 5 windows, which could result in loss of a window and rapid
loss of cabin pressure. Loss of cabin pressure could cause crew communication
difficulties or crew incapacitation.
NM-08-24 - This Special
Airworthiness Information Bulletin alerts you of an airworthiness concern on all
Boeing Model 737 airplanes relating to the potential failure of certain potable
water couplers during freezing weather conditions. The failure of the couplers
could result in water spraying and freezing around the outflow valve, rendering
the valve inoperative. If enough ice forms, the performance of the outflow valve
will be very limited. This could result in difficulty controlling cabin
pressure.
2008-11-04 -
We are adopting a new airworthiness directive (AD) for all Boeing Model
737-100, - 200, -200C, -300, -400, and -500 series airplanes. This AD requires
repetitive inspections for cracking in and around the upper and lower hinge
cutouts of the forward entry and forward galley service doorways, and corrective
actions if necessary. This AD results from multiple reports of cracks found in
the skin, bearstrap, and/or frame outer chord in the hinge cutout areas of the
forward entry and forward galley service doorways. We are issuing this AD to
detect and correct such cracking, which could result in rapid decompression of
the airplane.
2008-11-03 - We are adopting a new
airworthiness directive (AD) for all Boeing Model 737-100, - 200, and -200C
series airplanes. This AD requires revising the FAA-approved maintenance
inspection program to include inspections that will give no less than the
required damage tolerance rating for each structural significant item (SSI),
doing repetitive inspections to detect cracks of all SSIs, and repairing cracked
structure. This AD results from a report of incidents involving fatigue cracking
in transport category airplanes that are approaching or have exceeded their
design service objective. We are issuing this AD to maintain the continued
structural integrity of the entire fleet of Model 737-100, -200, and -200C
series airplanes.
2008-10-10 - We are
adopting a new airworthiness directive (AD) for certain Boeing Model 737- 600,
-700, -700C, -800, and -900 series airplanes. This AD requires revising the
Airworthiness Limitations (AWLs) section of the Instructions for Continued
Airworthiness by incorporating new limitations for fuel tank systems to satisfy
Special Federal Aviation Regulation No. 88 requirements. This AD also requires
the initial inspection of a certain repetitive AWL inspection to phase in that
inspection, and repair if necessary. This AD results from a design review of the
fuel tank systems. We are issuing this AD to prevent the potential for ignition
sources inside fuel tanks caused by latent failures, alterations, repairs, or
maintenance actions, which, in combination with flammable fuel vapors, could
result in a fuel tank explosion and consequent loss of the airplane.
2008-10-09 - We are adopting a new
airworthiness directive (AD) for all Boeing Model 737-100, - 200, -200C, -300,
-400, and -500 series airplanes. This AD requires revising the FAA-approved
maintenance program to incorporate new airworthiness limitations (AWLs) for fuel
tank systems to satisfy Special Federal Aviation Regulation No. 88 requirements.
This AD also requires the initial inspection of a certain repetitive AWL
inspection to phase in that inspection, and repair if necessary. This AD results
from a design review of the fuel tank system. We are issuing this AD to prevent
the potential for ignition sources inside fuel tanks caused by latent failures,
alterations, repairs, or maintenance actions, which, in combination with
flammable fuel vapors, could result in a fuel tank explosion and consequent loss
of the airplane.
2008-09-15 - We are
adopting a new airworthiness directive (AD) for all Boeing Model 737-100, - 200,
-200C, -300, -400, and -500 series airplanes. This AD requires repetitive
inspections for any cracking of or damage to the left side and right side flight
deck No. 2, No. 4, and No. 5 windows and corrective actions if necessary. This
AD results from reports of in-flight departure and separation of the flight deck
windows. We are issuing this AD to detect and correct cracking in the vinyl
interlayer or damage to the structural inner glass panes of the flight deck No.
2, No. 4, and No. 5 windows, which could result in loss of a window and rapid
loss of cabin pressure. Loss of cabin pressure could cause crew communication
difficulties or crew incapacitation.
2008-09-14 - We are adopting a new
airworthiness directive (AD) for certain Boeing Model 737- 600, -700, -700C,
-800 and -900 series airplanes. This AD requires inspecting ground blocks GD261
and GD264 for corrosion, measuring the electrical bond resistance between the
ground blocks and the airplane structure, separating the ground wires for the
fuel boost pump circuit between ground blocks GD261 and GD264, and doing
corrective actions if necessary. This AD results from a report of random flashes
of the six fuel pump low pressure lights and intermittent operation of the fuel
boost pumps. We are issuing this AD to prevent the simultaneous malfunction of
all six fuel boost pumps, which could cause the engines to operate on suction
feed and potentially flame out.
2008-09-13 - We are adopting a new
airworthiness directive (AD) for all Boeing Model 737-300, - 400, and -500
series airplanes. This AD requires revising the FAA-approved maintenance
inspection program to include inspections that will give no less than the
required damage tolerance rating for each structural significant item (SSI),
doing repetitive inspections to detect cracks of all SSIs, and repairing cracked
structure. This AD results from a report of incidents involving fatigue cracking
in transport category airplanes that are approaching or have exceeded their
design service objective. We are issuing this AD to maintain the continued
structural integrity of the entire fleet of Model 737-300, -400, and -500 series
airplanes.
2008-08-24 - We are
adopting a new airworthiness directive (AD) for certain Boeing Model 737- 600,
-700, -700C, -800, and -900 series airplanes. This AD requires replacing the
drain tube assemblies and support clamps on the aft fairing of the engine
struts. This AD results from reports of failure of the drain tube assembly and
clamp on the aft fairings of an engine strut. We are issuing this AD to prevent
failure of the drain tube assemblies and clamps on the aft fairings of the of
the engine struts. Such a failure could allow leaked flammable fluids in the
drain systems to discharge on to the heat shields of the aft fairings of the
engine struts, which could result in an undetected and uncontrollable fire.
2008-08-23 - We are adopting a new
airworthiness directive (AD) for all Boeing Model 737-200C series airplanes.
This AD requires revising the FAA-approved maintenance inspection program to
include inspections that will give no less than the required damage tolerance
rating for each structural significant item (SSI), doing repetitive inspections
to detect cracks of all SSIs, and repairing cracked structure. This AD results
from a report of incidents involving fatigue cracking in transport category
airplanes that are approaching or have exceeded their design service objective.
We are issuing this AD to maintain the continued structural integrity of the
entire fleet of Model 737-200C series airplanes.
2008-08-22 - We are adopting a new
airworthiness directive (AD) for certain Boeing Model 737- 600, -700, -700C,
-800, and -900 series airplanes. This AD requires a one-time inspection to
determine the material of the forward and aft gray water drain masts. For
airplanes having composite gray water drain masts, this AD requires installation
of a bonding jumper between a ground and the clamp on the tube of the forward
and aft gray water composite drain masts. This AD results from a report of
charred insulation blankets and burned wires around the forward gray water
composite drain mast found during an inspection of the forward cargo compartment
on a Model 767-300F airplane. We are issuing this AD to prevent a fire near a
composite drain mast and possible disruption of the electrical power system
caused by a lightning strike on a composite drain mast, which could result in
the loss of several functions essential for safe flight.
2008-08-10 - We are
adopting a new airworthiness directive (AD) for all Boeing Model 737-100, - 200,
-200C, -300, -400, and -500 series airplanes. For certain airplanes, this AD
requires replacing the outboard stabilizing fitting and certain adjacent
components of the main landing gear (MLG) support beam. This AD also requires
repetitive inspections for discrepancies of the outboard stabilizing fitting,
walking beam hanger, and rear spar attachment, and corrective actions if
necessary. For certain airplanes, this AD provides an alternative one-time
inspection of the outboard stabilizing fitting for discrepancies, and corrective
actions if necessary, which would extend the compliance time for the replacement
of the outboard stabilizing fitting. For certain other airplanes, this AD also
requires performing a torque check of the aft pin of the outboard stabilizing
fitting, and corrective actions if necessary. This AD results from reports of
findings of fatigue cracking of the outboard stabilizing fitting and stress
corrosion cracking of the bolts attaching the fitting to the wing rear spar. We
are issuing this AD to detect and correct that cracking, which could result in
disconnection of the MLG actuator from the rear spar and support beam,
consequent damage to the hydraulic system, and possible loss of the ''A'' and
''B'' hydraulic systems and damage or jamming of the flight control cables.
Damage or jamming of the flight control cables could result in loss of control
of the airplane.
2008-06-29 - We are
adopting a new airworthiness directive (AD) for all Boeing Model 737-300, - 400,
and -500 series airplanes. This AD requires repetitive inspections of the
downstop assemblies on the main tracks of the No. 2, 3, 4, and 5 slats and the
inboard track of the No. 1 and 6 slats to verify if any parts are missing,
damaged, or in the wrong order. This AD also requires other specified actions,
and related investigative and corrective actions if necessary. This AD results
from reports of fuel leaking from a puncture in the slat track housing (referred
to as the ''slat can''). We are issuing this AD to detect and correct loose or
missing parts from the main slat track downstop assemblies, which could puncture
the slat can and result in a fuel leak and consequent fire.
2008-06-24 - We are
adopting a new airworthiness directive (AD) for certain Boeing Model 737- 300,
-400, and -500 series airplanes. This AD requires an inspection to determine the
manufacturer and manufacture date of the oxygen masks in the passenger service
unit and the lavatory and attendant box assemblies, corrective action if
necessary, and other specified action. This AD results from a report that
several passenger masks with broken in-line flow indicators were found following
a mask deployment. We are issuing this AD to prevent the in-line flow indicators
of the passenger oxygen masks from fracturing and separating, which could
inhibit oxygen flow to the masks and consequently result in exposure of the
passengers and cabin attendants to hypoxia following a depressurization event.
2008-06-09 -
We are adopting a new airworthiness directive (AD) for certain Boeing Model 737-
200 series airplanes. This AD requires repetitive inspections to detect cracking
of the support fittings of the Krueger flap actuators, and corrective actions if
necessary. This AD also requires eventual replacement of any existing aluminum
support fitting on each wing with a steel fitting, and modification of the aft
attachment of the actuator. Doing these actions terminates the repetitive
inspection requirements. This AD results from reports of cracking due to fatigue
and stress corrosion of the support fittings of the Krueger flap actuator. We
are issuing this AD to prevent cracking of the support fittings, which could
result in fracturing of the actuator attach lugs, separation of the actuator
from the support fitting, severing of the hydraulic lines, resultant loss of
hydraulic fluids, and consequent reduced controllability of the airplane.
2008-06-03 - The FAA is adopting a new
airworthiness directive (AD) for certain Boeing airplanes, identified above.
This AD requires inspecting to determine if certain motor-operated shutoff valve
actuators for the fuel tanks are installed, and related investigative and
corrective actions if necessary. This AD also requires revising the
Airworthiness Limitations (AWLs) section of the Instructions for Continued
Airworthiness to incorporate AWL No. 28-AWL-21, No. 28-AWL-22, and No. 28-AWL-
24 (for Model 737-600, -700, -700C, -800 and -900 series airplanes); and No.
28-AWL-23, No. 28- AWL-24, and No. 28-AWL-25 (for Model 757-200, -200PF, -200CB,
and -300 series airplanes). This AD results from a design review of the fuel
tank systems. We are issuing this AD to prevent electrical energy from
lightning, hot shorts, or fault current from entering the fuel tank through the
actuator shaft, which could result in fuel tank explosions and consequent loss
of the airplane.
2008-05-06 - We are adopting a new
airworthiness directive (AD) for certain Boeing Model 737- 100, -200, -300,
-400, and -500 series airplanes. This AD requires repetitive inspections for
fatigue cracking in the longitudinal floor beam web, upper chord, and lower
chord located at certain body stations, and repair if necessary. This AD results
from several reports of cracks in the center wing box longitudinal floor beams,
upper chord, and lower chord. We are issuing this AD to detect and correct
fatigue cracking of the upper and lower chords and web of the longitudinal floor
beams, which could result in rapid loss of cabin pressure.
2008-05-05 - We are adopting a new
airworthiness directive (AD) for certain Boeing Model 737- 600, 737-700,
737-700C, 737-800, and 737-900 series airplanes. This AD requires an inspection
of the vertical fin lugs, skin, and skin edges for discrepancies; an inspection
of the flight control cables, fittings, and pulleys in section 48 for signs of
corrosion; an inspection of the horizontal stabilizer jackscrew, ball nut, and
gimbal pins for signs of corrosion; and corrective actions if necessary. This AD
results from reports indicating that moisture was found within the section 48
cavity. We are issuing this AD to ensure that the correct amount of sealant was
applied around the vertical fin lugs, skin and the skin edges. Missing sealant
could result in icing of the elevator cables, which could cause a system jam and
corrosion of structural and flight control parts, resulting in reduced
controllability of the airplane.
2008-04-21 - We are adopting a new
airworthiness directive (AD) for certain Boeing Model 737- 300, -400, and -500
series airplanes. This AD requires repetitive inspections for cracking of the
body buttock line (BBL) 0.07 floor beam between body station (BS) 651 and BS 676
and between BS 698 and BS 717, and related investigative and corrective actions
if necessary. This AD also provides an optional terminating action for the
repetitive inspections. This AD results from reports of cracking in the BBL 0.07
floor beam. We are issuing this AD to prevent failure of the main deck floor
beams at certain body stations due to fatigue cracking, which could result in
rapid decompression of the airplane.
2008-03-20 - The FAA is adopting a new
airworthiness directive (AD) for certain Boeing Model 737-300, -400, and -500
series airplanes. This AD requires, among other actions, modifying the
doormounted escape system of the forward right side door slide compartment. This
AD results from reports indicating that the forward right escape slide inflated
90 degrees out of alignment after deployment from the forward right side slide
compartment. We are issuing this AD to prevent the escape slide from being
unusable during an emergency evacuation and consequent injury to passengers or
crewmembers.
2007-26-04 - We are adopting a new
airworthiness directive (AD) for certain Boeing Model 737- 100, -200, -200C,
-300, -400, and -500 series airplanes. This AD requires repetitive detailed and
high-frequency eddy current inspections for cracking around the heads of the
fasteners on the forward fastener row of certain areas of the station (STA)
259.5 circumferential butt splice, and repair if necessary. This AD also
requires a preventive modification, which eliminates the need for the repetitive
inspections. This AD results from a report that an operator found multiple
cracks in the fuselage skin of a Model 737-200 airplane, at the forward fastener
row of the STA 259.5 circumferential butt splice between stringers 19 and 24. We
are issuing this AD to prevent cracking of the STA 259.5 circumferential butt
splice, which could result in loss of structural integrity of the fuselage skin
and possible loss of cabin pressure.
2007-25-03 - The FAA is adopting a new
airworthiness directive (AD) for certain Boeing Model 737-600, -700, -700C,
-800, and -900 series airplanes. This AD requires repetitive inspections of
either the aft side or forward side of the aft pressure bulkhead for oil can
conditions or bulges, a onetime inspection of the aft pressure bulkhead to
identify any previously installed web repair, and corrective actions if
necessary. This AD results from web oil can conditions found on the aft pressure
bulkhead of several airplanes. We are issuing this AD to detect and correct oil
can conditions, bulges, or previous repairs in the aft pressure bulkhead, which
could lead to web cracks and consequently result in rapid decompression of the
airplane.
2007-24-02 - The FAA is superseding an
existing airworthiness directive (AD) that applies to all Model 737-100, -200,
-200C, -300, -400, and -500 series airplanes. The existing AD currently requires
repetitive detailed inspections for damage of the electrical wire and sleeve
that run to the fuel boost pump through a conduit in the fuel tank, and arcing
damage of the conduit and signs of fuel leakage into the conduit; replacement of
the sleeve with a new, smaller-diameter sleeve; and related investigative and
corrective actions, as applicable. This new AD reduces the inspection threshold
for certain airplanes. This AD results from a report of a fuel tank explosion on
a Model 727-200F airplane on the ground, and a report of chafed wires and a
damaged power cable sleeve of a fuel boost pump discovered during an inspection
on a Model 737-300 airplane. (The fuel boost pump installation on certain Model
737 airplanes is almost identical to the installation on Model 727 airplanes.)
We are issuing this AD to detect and correct chafing of the fuel boost pump
electrical wiring and leakage of fuel into the conduit, and to prevent
electrical arcing between the wiring and the surrounding conduit, which could
result in arc-through of the conduit, and consequent fire or explosion of the
fuel tank.
NM-07-47 - This Special Airworthiness Information
Bulletin (SAIB) advises you, owners and operators of Boeing Model 737 series
airplanes equipped with forward airstairs, of a potential personal injury risk
associated with the possibility for small children to fall through openings in
the airstair handrails.
2007-18-52 - This document publishes in the
Federal Register an amendment adopting airworthiness directive (AD) 2007-18-52
that was sent previously to all known U.S. owners and operators of Boeing Model
737-600, -700, -700C, -800, -900, and -900ER series airplanes by individual
notices. This AD requires repetitive detailed inspections of the slat track
downstop assemblies to verify that proper hardware is installed, one-time
torquing of the nut and bolt, and corrective actions if necessary. This AD is
prompted by reports of parts coming off the main slat track downstop assemblies.
We are issuing this AD to detect and correct loose or missing parts from the
main slat track downstop assemblies, which could result in a fuel leak and
consequent fire.
2007-18-51 - We have received reports of
parts of the main slat track downstop assembly coming off the main slat track.
In one case, a nut fell into the slat track housing (referred to as “slat can”)
and, during a subsequent slat retraction, the track made contact with the nut,
pushing it into the wall of the can and puncturing it. That operator reported
finding fuel leaking from the drain hole in the slat track housing at the No. 5
slat track position. In another case, an initial investigation revealed that
following retraction of the slats after landing on a Model 737-800 airplane,
loose parts of the main slat track downstop assembly punctured the slat can,
which resulted in a fuel leak and a fire that ultimately destroyed the airplane.
Loose or missing parts from the main slat track downstop assemblies, if not
detected and corrected, could result in a fuel leak and consequent fire.
2007-15-04 - The FAA is superseding an
existing airworthiness directive (AD) that applies to certain Boeing Model
737-800 series airplanes. The existing AD currently requires inspecting flight
spoilers to determine spoiler position after every landing and after any
rejected takeoff maneuver. For airplanes on which any flight spoiler is found in
the up position with the speedbrake handle in the down position, the existing AD
requires replacing the flight spoiler actuator with a flight spoiler actuator
having a certain part number. The existing AD also requires an operational test
of the speedbrake control system after any maintenance actions that operate the
spoiler system, and replacement of the flight spoiler actuator if necessary. The
existing AD also provides for optional terminating action for those
requirements. This new AD requires the previously optional terminating action.
This AD results from a report of seven flight spoiler actuator jams on Model
737-800 airplanes equipped for short field performance (SFP). The cause of the
failure has been identified as interference within the actuator main control
valve. We are issuing this AD to prevent operation with defective flight spoiler
actuators, which could result in a flight spoiler actuator hardover, and could
cause the flight spoiler surface to jam in the fully extended position. Two or
more hardover failures of the flight spoiler surfaces in the up direction on the
same wing, if undetected prior to takeoff, can cause significant roll and
consequent loss of control of the airplane.
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Airworthiness Directives
