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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
