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THE BOEING 737 TECHNICAL SITE

Created by Chris Brady Sept 1999


CONTENTS



Search this website:
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INTRODUCTION

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.

All of the information, photographs & schematics from this website and much more
is now available in a recently updated 374 page  printed book or in electronic
format.

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.

This site uses cookies to personalise ads, to provide social media features and
to analyse traffic. It therefore also shares information about your use of the
site with social media, advertising and analytics partners. See details



All of the information, photographs & schematics from this website and much more
is now available in a 374 page printed book or in electronic format.

*** Updated 14 Nov 2021 ***











WEBSITE UPDATES & NEWS...

07 Dec 2021 - E & E Bay video released

02 Dec 2021 - Chinas CAAC issues an AD detailing requirements for operators to
resume MAX operations

16 Nov 2021 - MAX Differences video released

15 Nov 2021 - AD issued prohibiting various FCC software due to reports that the
A/P did not capture or track the glideslope correctly.

14 Nov 2021 - Book extensively updated, now including much of the material from
the videos

13 Nov 2021 - MAX -7 and -10 flight test update

13 Nov 2021 - An update on the MAX synthetic AoA and stick shaker inhibitor

09 Nov 2021 - 737NG AD issued for cracking of the webs of the aft pressure
bulkhead

02 Nov 2021 - The fuselage and nose section including the CVR and FDR of the
Rhoades Aviation 737-200C off Hawaii have been recovered

28 Oct 2021 - Details of 737-800, PH-HXG, operated by Transavia, wheel fire
after landing and evacuation at EHAM

25 Oct 2021 - Doors video released

23 Oct 2021 - Details of 737-300SF, PK-JRB, operated by Jayawijaya Dirgantara
Airlines overrun runway 30 after landing at Jayapura, Indonesia (WAJJ) on 22 Oct
2021.

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

23 Nov 2020 - 737 Technical Guide printed and EPUB versions updated

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