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
CALA2024122401636
Discrepancy Date
12/20/24
Submission Date
12/24/24
Airline Name
CALA
Registry Number
37535
Aircraft Make
BOEING
Aircraft Model
7379
Aircraft Total Time (hrs)
8540
Discrepancy
STRONG EXHAUST SMELL FRO M LEFT PACK.STRONG JET F UEL/EXHAUST SM ELL IN WHE EL AND FIRST CLASS.SMELL COMING FROM APU BLEED, RAN BOTH PACKS WITHOUT APU BLEED, NO SMELL IN CABIN. PLACARDED APU INOP MEL 4911A DISPATCH DESK: 23 NAME: RWB DATE: 19-DEC-24- NOC DESK: OM7 NAME: CO DATE: 19-DEC-24- TOMC APPROVED SMELL COMING FROM APU BLEED, RAN BOTH PACKS WITHOUT APU BLEED, NO SMELL IN CABIN. PLACARDED APU INOP MEL 4911A. NO OIL LEAKS NOTED FROM APU. UPUN CLEARING THIS MEL ITEM, CONTACT TOMC FOR ASSIGMENT OF MEL CARD 49001 TO ACCOMPLISH APU ETOPS VERIFICATION FLT. REF FIM 49-52 TASK 801. RAN PACKS ON APU AIR, EXHAUST / OIL SMELL STARTED WHEN PACKS WERE TURNED ON BUT DISSAPATED LESS THAN 5 MINUTES AFTER LT AND RT PACKS WERE RUNNING. CYCLED PACK TEMPS FROM COLD TO HOT SMELL DID NOT RETURN. HAD PACKS RUNNING FOR 20 MINUTES. STILL HAD ODOR USING APU BLEED DURING PART POWER RUNS FOR OTHER MAINTENANCE. REF LOG PAGE 3235772 NGS INOP, SUGGEST REPLACING NGS FILTER MODULE 61-4711-9-0001, NIS TPA AND SYSTEM AT THIS TIME. NGS IS STEP C.7 ON FIM 49-52 TASK 801 FOR APU OIL SMELL. REMOVED AND REPLACED NGS AIR SEPARATION MODULE (REF AMM TASK 47-11-01). OPS CHECKS GOOD. NO LEAKS FOUND. RAN PACKS FOR 30 MINUTES AN00-0609-3-2703,QTY :1 00-0604-3-1688,QTY :1 00-0608-3-1698,QTY :1 61-4711-9-0001,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1933095 SN OFF 7281 MODULE, AIR SEP OFF 61-4711-9-0001 7281 ON 61-4711-9-0001 7256