737 MAX Incident Reports

U.S. based airlines are required to submit safety reports called Service Difficulty Reports (SDRs) for malfunctions involving aircraft systems in accordance with U.S. law. The Federal Aviation Administration (FAA) is required by Department of Transportation policy to investigate these incidents to determine root causes and to ensure corrective action is taken by aircraft manufacturers and airlines to fix the problem(s). These reports are crucial for maintaining and improving aviation safety, as they help to identify potential hazards, evaluate risks, and implement corrective measures to prevent future tragedies.

The foundation believes it is important to highlight select reports involving 737 MAX airplanes. We find the reports listed below concerning because of the history of the MAX and the repetitive and/or serious nature of the reports.

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ASAA – Alaska Airlines, AALA – American Airlines, CALA – United Airlines, SWAA – Southwest Airlines

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Control Number
CALA2024080800393
Discrepancy Date
8/6/24
Submission Date
8/8/24
Airline Name
CALA
Registry Number
17337
Aircraft Make
BOEING
Aircraft Model
7378
Aircraft Total Time (hrs)
2001
Discrepancy
LE FLAP TRANSIT LIGHT ILLUMINATED IN FLIGHT - DID NOT RESET AFTE R QRH PROCEDUREBEGAN TROUBESHOOTING PROCEDURE. FAULT SHOWS ON #1 LEADING EDGE FLAP WITH ASSOCIATED MTC MESSAGE 27-81216. UNABLE TO CLEAR FAULT THROUGH FSEU INTERROGATION. REF FIM TASK 27-81 822. FAULT REMAINS. PERFORMED UP TO STEP D3 (FSEU REPLACEMENT) WHILE INSPECTING LE FLAP RETRACT SENSOR 1, FOUND SPLICES HAD SLIGHTLY PULLED APART DUE TO WIRE BUNDLE SECURED TOO TIGHTLY. SUSPECT THAT COULD BE POSSIBLE ISSUE. REMOVED AND RESPLICED WIRES FOR LE FLAP RETRACT SENSOR 1 (S168) REF SWPM 20-30-12. DURING TESTING IT WAS A NO FIX. LEFT LE FLAP 1 IN TRANSIT LIGHT STILL ILLUMINATED AND FAULT STILL EXISTS. MAY NEED NEW FSEU OR FURTHER WIRING CHECKS ACCOMPLISHED. SUSPECT SWITCH S-168 IS BAD, MOVED FLAPS TO A POSITION WHERE ALL SENSORS WERE OFF THEIR TARGETS, USED A SCALE ON OTHER 3 RETRACT SENSORS TO SIMULATE THE TARGET, ALL THEIR RESPECTIVE LIGHTS WENT OUT, DID THE SAME THING TO S -168 NO CHANGE STILL SHOWED IN TRANSIT. REMOVED LE FLAP 1 RETRACT SENSOR S168 REF AMM 27-88-11/401, RESISTANCE CKS OF WIRES FROM S168 TO THE FSEU GOOD REF WDM 27-81-11-1, INSTALLED NEW SENSOR S168 NO FIX, T/S FURTHER AND FOUND BAD GROUND AT GD614AC. VERIFIED GROUND GD614-AC IS BAD. BRACKET NOT GROUNDED TO THE AC. PERFORMED WIRING CHECKS FROM SWITCH S168, TO. FSEU REF WDM 27-81-11, SWITCH CHECKS GOOD. REBITE CK OF FSEU GOOD IAW AMM 27-51-01/401.
Control Number
CALA2024070300115
Discrepancy Date
6/27/24
Submission Date
7/3/24
Airline Name
CALA
Registry Number
17279
Aircraft Make
BOEING
Aircraft Model
7378
Aircraft Total Time (hrs)
5435
Discrepancy
REF L/P 8335328, UNABLE TO CREATE NEW CLIENT CREDENTIALS FOR AID-FWD. FOUND EXISTING ACTIVE FAULT 46-52003.AIRCRAFT INTERFACE DEVICE-FORWARD (AID-FWD WA DOES NOT RESPOND TO NFS COMMANDST/S PER FIM 46-13 TASK 857, NO HELP. SUSPECT AID INOP. M&E 61-4613-9-0001 N.I.S CLE. REQUEST MEL 4613A FOR ONS SYSTEM INOP DUE TO AID FAULT APPROVED ITEM PLACED ON MEL. DDP C/W *DM*: {INTERFACE DEVICE M3501/61-4613-9-0001 PREV ORDERED.} FIM 46-13/857 COVERS MM46-52003 FAULT ISLN. PRECAUTIONARILY ORDERED AID PWR CB C4113 / 99-2451-3-0014 & NFS M2898 / 43-4613-9-0001. NOTE: M3501 S/W VERIF @ AMM46-103-52-470-801. ALSO BE AWARE THAT NFS R&R MAY INVOLVE CAPTURING FILES & GENERATING KEYS: SEE AMM 46+-13-01-000-801 AND 46-13-01-400-801 FOR DETAILS. AVIONICS EG UPDATE: PLEASE START BY REPLACING THE AID. UPDATING LABOR/GROUND TIME HOURS FOR AID REPLACEMENT. ECRA 4613-01576 CAN BE UTILIZED FOR THE AID REPLACEMENT REMOVED AND REPLACED AID IN REF ECRA 4613-01576.NO HELP. T/S REF. B737-8 FIM 46-13 TASK 857. VERIFIED PWR GOING TO AI WWU. ADD FAULT: 46-52003 PWR ON LIGHT & STATUS LIGHT SHOW SOLID RED. AI WWU WILL NOT ACCEPT SOFTWARE LOAD, SEE ATTACHED PHOTO. SUSPECT EITHER WIRING BETWEEN AI WWU & NFS OR INSTALLED AI WWU BAD FROM STOCK. WILL REQ. FURTHER TROUBLESHOOTING PARTS USED: 1569351,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1569351 SN OFF 0296 DEVICE, AIRCRAF OFF 61-4613-9-0001 0296 ON 61-4613-9-0001 1MAJOR REPAIR AND RII FLAGS ENTERED IN ERROR. SEE PREVIOUS ENTRY FOR WORK ACCOMPLISHED.
Control Number
CALA2024061700006
Discrepancy Date
6/17/24
Submission Date
6/17/24
Airline Name
CALA
Registry Number
17265
Aircraft Make
BOEING
Aircraft Model
7378
Aircraft Total Time (hrs)
9109
Discrepancy
REF LP 8301672. WHEN REPLACING MMR1 FOUND PUSHED BACK PIN IN MMR1 BENCHPLUG CONN D10719B POS B8. REF SSM 34-58-11 PIN IS ASSOCIATED WITH 'IR OUTPUT BUS 4' SIGNAL.. VERRIFIED PIN B8 ON D10719B LOOKS TO BE PUSHED IN (ATTEMPTED TO TAKE PHOTO BUT YOU CANNOT TELL VERY WELL.) ATTEMPTED TO PUSH PIN BACK OUT WITHOUT DISTURBING THE E1-2 RACK, NO SUCCESS. E1-1 AND E1-2 WILL NEED TO BE TAKEN OUT IN ORDER TO GET ACCESS TO BENCH PLUG D10719B REMOVED E1-1 RACK AND ALL CONNECTORS AND COAX CABLES ATTACHED TO RACK IN ORDER TO GET ACCESS TO CONNECTOR D10719B. REF IPC 50-50-51-30 REMOVED E1-2 AND REMOVED CONNECTOR D10719B FROM E1-2 RACK. FOUND PIN IN B08 HAS INCORRECT PIN. PICTURE ADDED WITH A08 (RED WIRE) RIGHT NEXT TO IT. FLAGGED FOR SDR FOR CONNECTOR D10719B MFR P/N BACC66H40F03AM01 THE B INSERT MFR P/N BACI10AH14 INSERT CONFIGURATION 120T2 ONLY 1 TYPE OF CONTACT IS ALLOWED TO BE USED P/N BACC47EF1 REFERENCE B7X7 SWPM 20-71-14 PAGE 126 CONTACT CURRENTY INSTALLED IN ADD EMP:U382127, POSITION B8 ON D10719B IS NOT P/N BACC47EF1 AND WILL REQUIRE REPLACMENT AND RE-TERMIANTION REPLACED AND RE-TERMINATED POS B8 PIN CONTACT IN D10719B BACKSHELL. REFERENCE B7X7 SWPM 20-71-14 PAGE 126. MMR GROUND TEST OK. REF AMM 34-31-42-000-801. INSTALLED E1 & E2 RACKS. REF IPC 50-50-51-30. REF SMM 34-58-11. RE TERMINATED PIN IN B8 ON CONNECTOR D10719. ADD FAULT:NONE INSPECTION NOT REQIERED, REPAIR IS A MINOR IAW GMM 03-20-20 SDR NOT REQUIERED PER GMM 04-20-16.
Control Number
CALA2024061801844
Discrepancy Date
6/15/24
Submission Date
6/18/24
Airline Name
CALA
Registry Number
17264
Aircraft Make
BOEING
Aircraft Model
7378
Aircraft Total Time (hrs)
9109
Discrepancy
REF LP 8301672. WHEN REPLACING MMR1 FOUND PUSHED BACK PIN IN MMR1 BENCHPLUG CONN D10719B POS B8. REF SSM 34-58-11 PIN IS ASSOCIATED WITH ''IR OUTPUT BUS 4'' SIGNAL.. PLUG D10719B POSITION B8 ON D10719B IS NOT P/N BACC47EF1 AND WILL REQUIRE REPLACMENT AND RE-TERMIANTION VERRIFIED PIN B8 ON D10719B LOOKS TO BE PUSHED IN (ATTEMPTED TO REMOVED E1-1 RACK AND ALL CONNECTORS AND COAX CABLES ATTACHED TO REMOVED E1-2 AND REMOVED CONNECTOR D10719B FROM E1-2 RACK. ATTEMPTED TO PUSH PIN RACK IN ORDER TO GET ACCESS TO CONNECTOR D10719B. REF IPC PIN IN B08 HAS INCORRECT PIN. PICTURE ADDED WITH A08 (RED WIRE) THE B INSERT MFR P/N BACI10AH14 INSERT CONFIGURATION 120T2 ONLY BACK OUT WITHOUT DISTURBING THE E1-2 RACK, NO SUCCESS. E1-1 AND 50-50-51-30 RIGHT NEXT TO IT. 1 TYPE OF CONTACT IS ALLOWED TO BE USED P/N BACC47EF1 REFERENCE E1-2 WILL NEED TO BE TAKEN OUT IN ORDER TO GET ACCESS TO BENCH B7X7 SWPM 20-71-14 PAGE 126 CONTACT CURRENTY INSTALLED IN ADD EMP:U382127, REPLACED AND RE-TERMINATED POS B8 PIN CONTACT IN D10719B BACKSHELL. REFERENCE B7X7 SWPM 20-71-14 PAGE 126. MMR GROUND TEST OK. REF AMM 34-31-42-000-801. INSTALLED E1 & E2 RACKS. REF IPC 50-50-51-30. REF SMM 34-58-11. RE TERMINATED PIN IN B8 ON CONNECTOR D10719. ADD FAULT:NONE INSPECTION NOT REQIERED, REPAIR IS A MINOR IAW GMM 03-20-20 SDR NOT REQUIERED PER GMM 04-20-16.