Created by Chris Brady Sept 1999
Welcome to the Boeing 737 Technical Site. Here you will find technical, operational, and training notes; articles and photos contributed by 737 pilots and engineers from around the world.
Feel free to use anything here for your own personal use. If you are an organisation then please contact me for licence to use any of the images. Please note that I have a library of many thousands of technical images in high resolution.
Please treat your company FCOMs as the final authority in case your aircraft have differences. This website and the 737 Technical Guide have no connection to the Boeing Company.
If you have any suggestions or corrections to any of the information here, please email them on to me and I will write them into the site for the benefit of other visitors.
Follow the Boeing 737 Technical Site on social media using the links on the right to be notified of any updates.
*** Updated 23 Nov 2020 ***
Website updates & news...
14 Oct 2021 - Final report issued into OB-2036-P, 737-300 of Peruvian Airlines, which suffered a MLG shimmy and gear failure on landing at Jauja, Peru on 28 Mar 2017.
06 Oct 2021 - PSEU video released
01 Oct 2021 - 737-400F EI-STM, operated by ASL Ireland, Stab trim failure and flap jam on 7 Jul 2021.
30 Sep 2021 - NTSB sending a search vessel to find and recover the Transair 737-200 that ditched off Hawaii in July 2021
28 Sep 2021 - Eco Demonstrator update
19 Sep 2021 - NGS video released
17 Sep 2021 - Former Boeing Tech Captain to be indicted for misleading regulators over MCAS according to WSJ
11 Sep 2021 - Final report issued into Air India Express 737-800, VT-AXH, overrun after landing at Kozhikode
06 Sep 2021 - Singapore ungrounds the MAX
02 Sep 2021 - Malaysia ungrounds the MAX
31 Aug 2021 - Fuel systems video released
26 Aug 2021 - India ungrounds the MAX
23 Aug 2021 - 737-200C lands with side cargo door open - video footage
18 Aug 2021 - Footage of a 737-800 tyre failure whilst landing without antiskid
18 Aug 2021 - AD issued for 737-800 & 900ER ViaSat In-Flight Connectivity (IFC) System
12 Aug 2021 - Flight controls pitch video released
11 Aug 2021 - Max to start flight testing today in China for ungrounding
09 Aug 2021 - 737 MAX aft cargo compartment fire suppression AD issued
05 Aug 2021 - Final report published into N732MA, Miami Air 737-800, overrun at Jacksonville
04 Aug 2021 - SAIB issued for 737NG thrust reversers
30 Jul 2021 - FAA AD issued for MAX engine cowl spring door opening system
29 Jul 2021 - Flight controls Yaw video released
16 Jul 2021 - FAA AD issued for checks on cabin altitude pressure switches, 737-1-900 series
14 Jul 2021 - Flight controls Roll & Speedbrake video released
10 Jul 2021 - Photos of N810TA submerged released by NTSB
02 Jul 2021 - 737-200C N810TA, operated by Rhoades Aviation in Transair colors, ditches in sea off Honolulu, Hawaii
30 Jun 2021 - United orders 200 MAX
29 Jun 2021 - Hydraulics systems video released
23 Jun 2021 - FAA issue new MAX AD mandating replacement of the fuel quantity processor unit
25 Jun 2021 - FAA issue new 737-1/2/3/4/500 AD requiring HFEC inspections at L & R STA 540 bulkhead splice angle
23 Jun 2021 - FAA issue new MAX AD mandating 3 repetitive checks to the stab trim system
22 Jun 2021 - Hydraulics - Wheel-well tour video released
18 Jun 2021 - First flight of the MAX -10
17 Jun 2021 - FAA issue CANIC for functional checks during maintenance to the 737 MAX digital flight control system, stabilizer trim, and the primary and secondary aisle stand stabilizer.
16 Jun 2021 - Landing gear guided tour video released
16 Jun 2021 - First MAX 8200 delivered
15 Jun 2021 - FAA AD issued on the 737 NG NGS
10 Jun 2021 - Fire Protection systems video published
03 Jun 2021 - Dutch Safety Board warning to check aircraft returning to service after storage
02 Jun 2021 - P-8A Poseidon video published
30 May 2021 - First BBJ MAX-8 redelivered by Jet Aviation
27 May 2021 - Boeing to pay $17 million in FAA settlement over MAX/NG slat track sensors
26 May 2021 - Ice and Rain protection video published
21 May 2021 - Boeing to increase the MAX production rate
19 May 2021 - Preliminary report issued into 737-500, 5N-SYS, operated by Azmaan Air multiple tire burst on landing at Lagos, Nigeria on 16 Feb 2021
19 May 2021 - Boeing has resumed deliveries of the MAX following approval of a fix for the electrical grounding issue
19 May 2021 - 737 Classic autothrottle computer issues video published
19 May 2021 - Landing Gear video published
18 May 2021 - A/T flap synchro wire on 737 Classics AD issued
15 May 2021 - FAA requiring checks within 250hrs or two months on A/T flap synchro wire on 737 Classics
13 May 2021 - MAX electrical bonding SB approved by FAA and issued
11 May 2021 - Powerplant video published
05 May 2021 - Preliminary report issued into 737-400SF, PK-YSF, operated by Trigana Air Service engine failure and main landing gear collapse whilst landing at Jakarta Halim, Indonesia.
05 May 2021 - MAX electrical bonding issues update
05 May 2021 - LEAP-1B AD issued to address storage-induced corrosion issues
04 May 2021 - DC & Standby Electrics video published
01 May 2021 - New Gravel Runway presentation. Covering all aspects of gravel and unpaved runway operations on the 737. Including Landing surface requirements, External modifications, Flight deck controls & indications, Operational procedures and limitations.
30 Apr 2021 - FAA issue AD for MAX electrical bonding issue
28 Apr 2021 - Boeing Earnings Q1 2021 Call Transcript - 737 Items
26 Apr 2021 - AC Electrics video published
23 Apr 2021 - 737-1/2/3/4/500 skin cracking AD issued
22 Apr 2021 - The NTSB has opened an investigation docket into N732MA Miami Air 737-800 overrun into St Johns River on 3rd May 2019
21 Apr 2021 - MAX electrical bonding issues discussed
21 Apr 2021 - 737NG crew oxygen mask stowage box units AD issued
20 Apr 2021 - DoT Initiated an Audit of FAA's Oversight of Boeing 737 MAX Return to Service
20 Apr 2021 - New 737 APU presentation released
20 Apr 2021 - The Indian DGCA announced that 737 Max will be allowed to overfly Indian airspace but no commercial arrivals or departures will be allowed.
20 Apr 2021 - 737-900ER MLG electrical connector corrosion AD issued
13 Apr 2021 - New 737 Pressurisation presentation released
06 Apr 2021 - New 737 Air Conditioning presentation released
05 Apr 2021 - 737-200 Pitot heat AD issued by the FAA
31 Mar 2021 - MAX -8200 certified by the FAA
30 Mar 2021 - New 737 pneumatics presentation released
20 Mar 2021 - Boeing change Engine Fire Drills, in-flight and on-ground.
20 Mar 2021 - 737-400SF, PK-YSF, operated by Trigana Air Service main landing gear collapse whilst landing at Halim Perdanakusuma Airport, Indonesia.
18 Mar 2021 - New 737 MAX differences presentation released
18 Mar 2021 - Final report published into UR-PSR Ukrainian Airlines 737-800 shot down in error by Iranian SAMs after take-off from Tehran IKA airport 8 Jan 2020
16 Mar 2021 - Final report published into VP-BPS, 737-500 operated by UT Air that landed short of the runway at Usinsk on 9 Feb 2020.
14 Mar 2021 - Germany approved to buy five P-8A Poseidons
14 Mar 2021 - Final report published into OO-JAY 737-800 tailstrike on landing at Marrakech 2 May 2018
08 Mar 2021 - More details on the changes to the MCAS/FCC software
05 Mar 2021 - My latest presentation “A detailed look at MCAS on the 737 MAX”
25 Feb 2021 - US DoT have published their report into FAA oversight of the MAX certification
23 Feb 2021 - 737NG bear strap cracking AD issued
23 Feb 2021 - 737NG SOB slot sealant AD issued
23 Feb 2021 - P-8A to get upgraded radar, the new Raytheon AN/APY-10
23 Feb 2021 - 737NG & MAX AD to address cracked or completely severed lugs in the upper aft corner stop fitting assembly of the forward entry door
17 Feb 2021 - Boeing issue FOTB on the prevention of aircraft upsets
17 Feb 2021 - The UAE authorises the 737 MAX to fly again in UAE airspace.
10 Feb 2021 - Preliminary report issued into 737-500 PK-CLC of Sriwijaya Air that crashed into the Java Sea
06 Feb 2021 - Link to my presentation to the RAeS on the 737 MAX and MCAS story
05 Feb 2021 - Tata Boeing Aerospace Limited to Manufacture 737 Vertical Fin Structures in Hyderabad, India
03 Feb 2021 - MAX-10 deliveries delayed until 2023
31 Jan 2021 - My presentation to the RAeS on the 737 MAX and MCAS story 4 Feb 2021 at 18:30GMT
27 Jan 2021 - EASA declares Boeing 737 MAX safe to return to service in Europe
21 Jan 2021 - Discussion on hard landings
19 Jan 2021 - West Atlantic 737-400F G-JMCY heavy landing & possible W/O at Exeter
18 Jan 2021 - Transport Canada issue their ungrounding AD for MAX
13 Jan 2021 - Preliminary report issued into 737-400, ZS-OAF Safair which suffered a depressurisation whilst climbing out from Cape Town, South Africa on 22nd Nov 2020.
09 Jan 2021 - 737-500 PK-CLC of Sriwijaya Air has crashed into the Java Sea
07 Jan 2021 - Boeing to pay $2.5 billion to settle US Justice Department investigation and admits that employees misled regulators about the safety of the MAX
06 Jan 2021 - 737-500, EY-560, Air Djibouti landing accident at Garowe, Somalia. Preliminary report issued.
30 Dec 2020 - A description of 737 storage issues
29 Dec 2020 - Summary of changes in legislation following the 737 MAX accidents
26 Dec 2020 - 737-700, VQ-BIP operated by Yakutia overran the runway after landing during snow at Vnukovo, Russia on 25th Dec 2020
23 Dec 2020 - 737-1/2/3/4/500 center wing box cracks inspection AD issued
23 Dec 2020 - Latest FAA TCDS Rev 66 updated 9 Nov 2020 available here
22 Dec 2020 - Details of Lion Air 737-900ER PK-LGP Runway excursion after landing at Bandar Lampung, Indonesia on 20th Dec 2020.
21 Dec 2020 - 737-1/2/3/4/500 fuselage skin panel cracking AD issued
19 Dec 2020 - The Senate Committee on Commerce, Science, and Transportation, has released the Committee’s investigation report on the FAAs Safety Oversight
18 Dec 2020 - Transport Canada announce MAX ungrounding AD to be issued in Jan 2021.
16 Dec 2020 - The two (Senate & House) US legislative bills explained
13 Dec 2020 - The NTSB have issued their final report into N766SW uncontained engine failure and loss of pressurisation on 27 Aug 2016.
06 Dec 2020 - The South African CAA have issued their final report into the Stab out of trim incident to 737-800, ZS-SJD, operated by Mango on 2 Sep 2019.
04 Dec 2020 - Ryanair orders 75 Boeing MAX 8200s in largest order since grounding
02 Dec 2020 - 737-500, EY-560, operated by Air Djibouti has suffered left main landing gear collapse at low slow during the landing roll at Garowe, Somalia. No injuries.
27 Nov 2020 - The Nigerian AIB have published their final report into the runway excursion involving Boeing 737-500, 5N-BLG at Lagos on 9th April 2016.
26 Nov 2020 - Stall warning system page added
25 Nov 2020 - Full details of the changes to the MCAS system and assoiated procedures & training are detailed here.
24 Nov 2020 - EASA have issued a proposed AD 20-184 cancelling the ‘suspension of flight operations‘ The affected Boeing 737-8 and 737-9 aeroplanes can be returned to service, provided that the required actions proposed in this PAD have been accomplished.
20 Nov 2020 - The Ukrainian NBAAI have published their final report into the runway excursion and nosegear collapse of 737-800, TC-JGZ operated by Turkish Airlines at Odessa on 21 Nov 2019.
20 Nov 2020 - 737 MAX ungrounding conditions AD issued
20 Nov 2020 - 737-800BCF details added
18 Nov 2020 - FAA rescinds the MAX grounding order
18 Nov 2020 - Stab Trim Runaway procedure changes again
08 Nov 2020 - Final report issued into HS-KMC, 737-400F, K-Mile Asia at Singapore, main gear torsion link failure on landing on 5 Jun 2019.
04 Nov 2020 - The Nigerian AIB have published their final report into the runway excursion involving Boeing 737-200, 5N-BIG at Port-Harcourt International Airport on 14th July, 2008.
03 Nov 2020 - Proposed new Runaway Stabiliser procedure added
07 Oct 2020 - The FAA have issued draft Flight Standardization Board Report FSBR B737 Rev 17 for comments by 2 Nov 2020.
07 Oct 2020 - Enhanced Vision Systems page added
26 Sep 2020 - MAX to get a third AoA source
24 Sep 2020 - 737NG FQIS AD issued
16 Sep 2020 - The House Committee on Transportation & Infrastructure published its final report on the Design, Development, and Certification of the Boeing 737 MAX
11 Sep 2020 - Final report issued into Safair, 737-400, ZS-DMI, smoke in the cockpit event whilst climbing en-route to OR Tambo, South Africa on 19 Dec 2019
11 Sep 2020 - JOEB to conduct a multi-day simulator session in London from 14 Sep 2020 for MAX checklist & memory items.
10 Sep 2020 - GAMECO and Boeing have jointly announced that a second 737NG freighter conversion line will be built in Guangzhou
07 Sep 2020 - EASA begins MAX validation flight tests from Vancouver.
25 Aug 2020 - FAA issue AD for 737CL PSUs
11 Aug 2020 - AD issued for all CFM56 powered 737's to address engine bleed air 5th stage check valves being stuck open
07 Aug 2020 - 737-800, VT-AXH, operated by Air India Express has overrun runway 10 after landing and fell down a ravine at Kozhikode, India.
04 Aug 2020 - The FAA issue NPRM to supersede Airworthiness Directive (AD) 2018-23-51 to unground the MAX
03 Aug 2020 - The FAA have issued a 96-page Return to Service Preliminary Study for the MAX
27 Jul 2020 - The UK CAA amended Safety Directive SD 2019/001 for the 737 MAX, to introduce the possibility for managed ferry flights
24 Jul 2020 - Emergency AD issued for all CFM56 powered 737's to address engine bleed air 5th stage check valves being stuck open
21 Jul 2020 - Boeing issue FOTB "737 MAX Return to Service Operational Readiness Flight"
23 Jul 2020 - 737 Classic nacelle fatigue cracking AD issued
17 Jul 2020 - PEMCO B737-700FC (FlexCombi) gains FAA STC
15 Jul 2020 - MAX Kathon FP 1.5 Biocide AD issued today
06 Jul 2020 - MAX Operational Readiness Review flight tests to commence soon
02 Jul 2020 - FAA maps out remaining tasks to lift the MAX grounding order
29 Jun 2020 - Boeing & FAA commence a 3-day certification flight test program for the MAX
25 Jun 2020 - FAA issue MAX engine nacelle and strut electrical bonding AD
25 Jun 2020 - Boeing asked by regulators to consider further design enhancements to the MAX
19 Jun 2020 - Final report published into West Atlantic 737-400 G-JMCR electrical failures in-flight at Brussels on 4 Jun 2019
16 Jun 2020 - Gameco Inaugurates Boeing 737-800 Freighter Conversion Line
11 Jun 2020 - MAX MMEL post-MCAS fixes Revision 2 changes detailed
05 Jun 2020 - 737-400SF, N733CK, opertaed by Kalitta Charters II has overrun the runway following an RTO at Rochester, New York on 5 Jun 2020.
04 Jun 2020 - Aircraft Safety Improvement Act proposed to mandate SMS by manufacturers and consideration of HF by FAA.
29 Apr 2020 - Investigation launched into Boeing’s compliance with MAX production regulations
08 Apr 2020 - MCAS test flight delayed by a month due to Coronavirus
31 Mar 2020 - More P-8A Sales
30 Mar 2020 - Final report released into 737-800, VH-VUH Virgin Australia failure of the #1 main wheel assembly whilst taxying at Brisbane on 4 Jan 2017.
21 Mar 2020 - Final report published into the runway excursion on landing of Belavia, 737-300, EW-336PA, at Kiev on 12 July 2019
13 Mar 2020 - Preliminary report issued on TC-IZK Pegasus 737-800 runway excursion on landing at Istanbul 5 Feb 2020
09 Mar 2020 - Interim Investigation Report published into Ethiopian MAX-8 MCAS accident of 10 March 2019
06 Mar 2020 - The House Committee on Transportation & Infrastructure today published its Preliminary Investigative Findings on the 737 MAX Costs, Consequences, and Lessons from its Design, Development, and Certification.
27 Feb 2020 - Preliminary report issued into Safair, 737-400, ZS-DMI, smoke in the cockpit event whilst climbing en-route to OR Tambo, South Africa on 19 Dec 2019
25 Feb 2020 - PK-YSG, 737-300SF, Trigana Air Service, MLG collapse whilst taxying at Jayapura, Indonesia
05 Feb 2020 - TC-IZK Pegasus 737-800 runway excursion on landing at Istanbul
22 Jan 2020 - Final report published into UT Air 737-800 VQ-BJI runway excursion after landing at Sochi 01 Sep 2018
22 Jan 2020 - Revised preliminary report issued into the shooting down of UR-PSR at Tehran
19 Jan 2020 - MCAS - Special Committee investigation into FAA Certification of MAX report released
17 Jan 2020 - 737NG left temperature control valve and control cabin trim air modulating valve AD issued
10 Jan 2020 - Emails released discussing MAX differences from NG and differences to reduce certification and training impact
08 Jan 2020 - Ukrainian Airlines 737-800 shot down in error by Iranian SAMs after take-off from Tehran IKA airport