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
ASAA2023091945214
Discrepancy Date
9/19/23
Submission Date
9/21/23
Airline Name
ASAA
Registry Number
972AK
Aircraft Make
BOEING
Aircraft Model
7379
Aircraft Total Time (hrs)
6115
Discrepancy
#2 ENGINE IS ALERTING FOR A SLIGHT OIL FILTER DELTA PRESSURE INCREASE INDICATING A POTENTIAL RDS ISSUE. (#PRIAOG/ETOPS) CNR 20230919040. GROUNDED - YES. (RESOLVED ON W/O: 1970191 TASKCARD: N/R-00001 ) FOUND MAINT MSG 79-42885 FOR ENG NO. 2 OIL FILTER APPROACHING BYPASS -ACTIVE. IFIM TASK G79-21-00-810-812. ODMS SENSOR INSPECTED FOUND CONTAMINATION OF THE MAGNETIC VARIETY. SAMPLE RETAINED FOR AOG ENG/TECH SERVICES REF AMM 79-21-12. ODMS SENSOR REINSTALLED REQUIRES AMM 71-00-00 TESTS 4, 17, & 26. REMOVED AND REPLACED OIL FILTER CARTRIDGE ELEMENT REF AMM 79-21-07. CONTAMINATION FOUND IN PLEATS. ELEMENT RETAINED FOR FORWARDING TO AOG ENG/TECH SERVICES. REQUIRES TES 4 AMM 71-00-00. ENG OIL SYSTEM WEAR METAL CONTAMINATION INSPECTION OIL SAMPLE COLLECTED FOR AOG ENG/TECH SERVICES REF AMM 79-00-00. MAG STARTER PLUG INSPECTION COMPLIED WITH WITH NO CONTAMINATION NOTED REF AMM 80-11-09. PERFORMED ENGINE 2 OIL SYSTEM FLUIDS AND SOLIDS CONTAMINATION DETAILED INSPECTION REF AMM 79-00-00-211-801-G00 OIL SAMPLE SENT FOR EXAMINATION. OIL TUBE DRAIN PLUG PACKING REUSED AND REQUIRES REPLACEMENT. PERFORMED ENGINE 2 SCAVENGE SCREEN PLUGS INSPECTION REF AMM 79-21-04 NO CONTAMINATION NOTED. REQUIRES AMM 71-00-00 TEST 4. REMOVED AND REINSTALLED OIL TUBE DARIN PLUG WITH NEW PACKING REF AMM 79-00-00. ACCOMPLISHED OMS CHIP COUNT RESET, TEST 26 REF AMM 71-00-00. PERFORMED AMM 71-00-00 TESTS 4, 5 AND 17. LEAK CHKS GOOD.
Control Number
ASAA2023090745178
Discrepancy Date
9/7/23
Submission Date
9/18/23
Airline Name
ASAA
Registry Number
976AK
Aircraft Make
BOEING
Aircraft Model
7379
Aircraft Total Time (hrs)
5151
Discrepancy
CFM DIAGNOSTICS IS SHOWING #2 S/N 603126 ENGINE ODMS CUMMULATIVE CHIP COUNT IS REPORTING ELEVATED. (#PRI2/ETOPS). GROUNDED - YES. (RESOLVED ON W/O: 1969727 TASKCARD: N/R-00001 ) OPENED ENG #2 FAN COWLS PER AMM 71-11-04-010-803-G00 TO FOM. PERFORMED OPENING OF ENG #2 TR PER AMM 78-31-00-000-801-G00 TO FOM. PERFORMED ENG OIL SYSTEM FLUSHING PER AMM 12-13-11-100-801 4A-4D. REMOVED ENG #2 SURFACE AIR COOLING OIL COOLER #1 PER AMM 79-21-02-000-800-G00. DRAINED OIL OF SURFACE AIR COOLING OIL COOLER #1 PER AMM 12-13-11-100-801(F)1, REINSTALLED SURFACE AIR COOLING OIL COOLER #1 PER AMM 79-21-02-000-801-G00. SURFACE AIR COOLING OIL COOLER #2 STILL NEEDS FLUSHED. SP 39047. PER TSR, #2 ENG STARTER REPLACED REF AMM 80-11-01. #2 ENG SAV REMOVED AND REINSTALLED REF AMM 88-11-02. REMOVED AND REINSTALLED SAV MANUAL CONTROL LWR H/W REF AMM 80-11-07. SAV & STARTER POST MX REQUIRES POWERPLANT TEST NO. 1 - PNEUMATIC LEAK TEST, NO. 15 - ACTUATOR OPERATIONAL TEST, NO 32. ENGINE IDLE SYSTEM TEST. MECHALAS 13479 09/15/2023.CONTINUED OIL SYSTEM FLUSH PER AMM 12-13-11-100-801 STEPS 4I(1)(F) THROUGH 4I(1)(K)4)D) AND STEP 4I(1)(L)1). NO CONTAMINATION FOUND ON SCAVAGE PLUG SCREENS. INSTALLED SCAVAGE PLUG SCREENS PER AMM 79-21-04-400-801-G00. A JOHNSON 10234 09/15/2023. CONTINUED ENG OIL SYSTEM FLUSH PER AMM 12-13-11-100-801 STEPS 4I.1(5) E TANGONAN 58718 09/15/2023. COMPLETED OIL SYSTEM FLUSH PER AMM 12-13-11-100-801. LEAK CHECKS GOOD. J CLEMENTE 57891 09/16/2023. ACCOMPLISHED POWERPLANT TESTS NO 1, NO 1