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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ASAA2023072044137

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HOT BATTERY CIRCUIT BREAKER POPPED. GROUNDED - YES. REF. AMM 20-60-01: ACCOMPLISHED INSPECTION AND SUBSEQUENT RESET OF P6-4 E15 (C134) CB OBSERVING NO DEFECTS. CONFIRMED CORRECT INDICATION RESTORED TO P5-13 DISPLAY W/ NO FAILURES SET. REF. AMM 24-21-53, WDM 24-33-13-1 AND 24-33-11-2. CONFIRMED DFDAU SECURE IN RACK. NO HISTORY PAST 30 DAYS. ETOPS GROUND VERIFICATION SUCCESSFUL, SEAMC ARNIE NOTIFIED.

ASAA2023072044138

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FMC DISAGREE ON SCRATCHPAD. GROUNDED - YES. ACCOMPLISHED IFIM 34-61-00-810-918. OPS NORMAL.

ASAA2023072044171

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WHILE PERFORMING TASK CARD 31-005-00 SCHEDULED MAINT TASK DISPLAY SYSTEM FOUND SMT MESSAGE BLEED CTRL CARD R. GROUNDED - YES. ON DEFERRAL.

ASAA2023072044136

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APU GEN CONT UNIT CIRCUIT BREAKER OUT. GROUNDED - YES. RESET APU GEN CONT C/B ON P6-4 WITH NO FAULTS PER WDM 24-22-31-1 AND AMM 20-60-01. PERFORMED GOOD OPS TEST OF APU GEN PER AMM 24-21-00-700-801. NO HISTORY PAST 30 DAYS.

ASAA2023072044177

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CA NAV DISPLAY SHOWED VTK WITH DUAL FMC FAILURE. BOTH FMC'S RECOVERED & VTK FLAG REEMOVED AFTER 30 SEC WITHOUT INTERVENTION. GROUNDED - YES. REBOOTED LT FMC - SYS OPS OK.

ASAA2023071944118

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PRESSURIZATION "AUTO FAIL" LIGHT CAME ON AT FL340 CABIN DIFT-7.8 CABIN PRESS 6500FT QRH 2.2 ACCOMPLISHED. GROUNDED - YES. ON DEFERRAL.

ASAA2023071844120

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UNABLE TO TRANSIT ON HF#1, HOWEVER,ABLE TO RECEIVE ON HF#1.HF#2 OPERATING NORMALLY. GROUNDED - YES. ON DEFERRAL.

CALA2023071902272

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FO SIDE LOST NAV DISPLAY INFO.FMC SINGLE OPERATIO N ON APP.CAPTA IN SIDE OKAY REPLACED RIGHT FLIGHT MANAGMENT COMPUTER REF AMM TASK 34-61-02-400-801. OPS CHECKS GOOD REF AMM TASK 34-61-00-710-801. PARTS USED: 29-3461-9-0001,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1665312 SN OFF 8444 COMPUTER, FLT M OFF 29-3461-9-0001 8444 ON 29-3461-9-0001 7713

ASAA2023071744069

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WHILE ACCOMPLISHING T/C 31-005-00 FOUND SMT FAULT "PACK CONTROL CHANNEL R". GROUNDED - YES. ACCOMPLISHED AIR CONDITIONING, SYSTEM TEST, AIR CONDITIONING IBIT REF AMM 21-00-00. ALL TEST PASS. FAULT CLEARED.

ASAA2023071744110

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L FMC FAIL. GROUNDED - YES. ON DEFERRAL.

ASAA2023071744082

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WHEN PREFORMING TASK CARD 31-005-00 FOUND SMT MESSAGE ENG 1 EEC C2. GROUNDED - YES. THROUBLESHOT PER IFIM TASK G73-10-00-810-803 NO CORRELATED MAINTENANCE MESSAGES FOR ENG 1 EEC C2 SMT MESSAGE PER IFIM ERASED SMT MESSAGE AND PREFORMED ENG 1 IDLE SYSTEM TEST, TEST GOOD. SMT MESSAGE DID NOT SHOW ON SMT DISPLAY SEAMC PEATER NOTIFIED.

ASAA2023071744085

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TECH SERVICES FOLLOW UP ON URGENT CNR 20230717011 FOR #1 ENG (60A677) CUMULATIVE ODMS CHIP COUNT INCREASE - LOW THRESHOLD **WITHIN NEXT 5 CYCLES**#PRI1/ETOPS. GROUNDED - YES. (RESOLVED ON W/O: 1962223 TASKCARD: N/R-00001 ) ACCOMPLISHED STEP 1 OF TSR , INSPECTION OF THE ODMS SNSOR FOUND SMALL AMOUNT OF FUZZ AND (1) SMALL SLIVER IF DEBRI. SAMPLE TAKEN TO AOG ENGINEERING. ACCOMPLISHED INSPECTIONS #2 AND #3, NO FURTHER DEBRIS FOUND. ACCOMPLISHED REMAINDER OF TSR714657 WITH NO FURTHER ACTIONS AND DEFECTS NOTED.

ASAA2023071644038

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WHILE PERFORMING T/C #05-020-01 FOUND MESSAGE ENG 1 EEC C2 LONG TERM FAULT. GROUNDED - YES. ON DEFERRAL.

ASAA2023071644039

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WHILE PERFORMING T/C #31-005-00 FOUND BLEED FAMV RVDT L FAULT. GROUNDED - YES. ON DEFERRAL.

ASAA2023071644083

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#2 ENGINE NO LIGHTOFF WITHIN 15 SECONDS WITH IGNITOR SWITCHED TO IGNL STARTS FINE WITH IGNR. GROUNDED - YES. (RESOLVED ON W/O: 1962223 TASKCARD: N/R-00002 ) REMOVED AND REPLACED L/H IGNITER ON #2 ENG REF AMM 74-21-02. OPS CHECK GOOD. ENG STARTS NORMAL WITH IGNL. THIS CLEARS MEL 74-00-01A. PLACARDS REMOVED. SEAMC CARL NOTIFIED.

ASAA2023071644072

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HF 1 NOT WORKING CORRECTLY RECIVE BUT NOT TRANSMIT HF2, SATCOM AND DATALINK ALL WORK CORRECTLY. GROUNDED - YES. PERFORM IFIM TASK 23-11-00-810-813 NO ATA 23 FOUND IN OMF PERFORM HF SYSTEM TEST IAW AMM 23-1-00-730-801. HF1 TRANSMITTED AND RECEIVED NO DEFECT NOTED.

ASAA2023071644125

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GE DIAGNOSTICS REPORTS THE #2 ENGINE IS GENERATING ALERTS FOR PS3 OUT OF RANGE, PS3 PRESSURE DISAGREE FAULT, P3B OUT OF RANGE, P3B PRESSURE DISAGREE FAULT, OR P3B VS PS3 PRESSURE DISAGREE FAULT. (TASK CARD 73-ASA-01)-----#PRI1/ETOPS----- CNR # 20230716004*****ETOPS SIGNIFICANT SYSTEM*****. GROUNDED - YES. ACCOMPLISHED #2 ENGINE PRESSURE SUB SYSTEM, PS3 & P3B SENSE LINES MOISTURE DRY OUT PER TC 73-ASA-01 ON #2 ENG.

ASAA2023071644026

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WHEN PERFORMING SCHEDULED MAINTENANCE TASK DISPLAY TASK CARD FOUND SMT MEGGASE BLEED FAMV RVDT R. GROUNDED - YES. ON DEFERRAL.

ASAA2023071644047

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#1 SPAR VALVE CLOSED LIGHT ON BRIGHT BLUE. GROUNDED - YES. REF B737-9 WDM 28-21-11 & B737-9 AMM 20-60-01 INSPECTED C/B P6-3 B-4 THAT WAS FOUND "OUT" & RESET C/B. ACCOMPLISHED #1 ENG SPAR VALVE TEST REF A MM 28-22-00-710-801. OPS TEST OK. RAN #1 ENG PRECAUTIONARY NO DEFECTS NOTED.

ASAA2023071544041

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WHILE ACCOMPLISHING T/C 31-005-00, FOUND SMT "BLEED FAMV RVDT L"MAINT. MSG. 36-12030 "ENG-1 FAMV RVDT SIGNAL IS OUT OF RANGE". GROUNDED - YES. (RESOLVED ON W/O: 1961654 TASKCARD: N/R-00002 ) PERFORMED ELECTRICAL LRU REPLACEMENT TEST REF. AMM TASK 36-00-00-710-801, ALL TEST PASSED. NO LATCHED MESSAGES AT THIS TIME. THIS CLEARS PLT.

ASAA2023071544033

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ELEC LIGHT ILLUMINATED. GROUNDED - YES. CLEARED BATTERY CHARGER FAULTY CODE ON ELEC CONTROL PANEL OPS CK GOOD.

ASAA2023071544055

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AUX PITOT ILLUMINATED AFTER PUSH. GROUNDED - YES. REMOVED AND REPLACED AUX PITOT PROBE REF B737-9 AMM 34-11-01.

ASAA2023071544057

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APU FAULT LIGHT ILLUMINATED DURING FIRST START ATTEMPT AFTER LANDING. SECOND ATTEMPT WAS SUCCESSFUL. GROUNDED - YES. INTERROGATED CDU FOUND NO EXISTING APU FAULTS, NORMAL START ACCOMPLISHED.

ASAA2023071544056

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NO DUCT PRESSURE WITH APU BLEED AIR SWITCH ON. GROUNDED - YES. PERFORMED B737-9 FIM TASK 49-52-00. CYCLE POWER BLEED AIR BACK TO NORMAL.

ASAA2023071444050

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RIGHT SIDE WINDOW HEAT (FWD & SIDE) POWER ON LIGHTS EXTINGUISHED WITH SWITCHES ON. GROUNDED - YES. OPS TEST NORMAL REF. AMM 30-41-00-710-801.

ASAA2023071444044

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EXPERIENCED DUAL FMC FAILURE @ FL340 1 MIN THEN WENT BACK TO NORMAL. GROUNDED - YES. PERFORMED FMC RESET PER B737-9 IFIM 34-61-00 OPS CHECK NORMAL.

ASAA2023071444025

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FLIGHT ATTENDANT REPORTS R2 DOOR MAKING NOISE AT CRUISE FL330 PSID 7.8 DOOR HANDLE INDICATES CLOSED PROPERLY. NO DOOR OPEN LIGHTS. PRESSURIZATION NORMAL. DOOR NOISE MAY BE COMING FROM LOWER RIGHT AREA OF DOOR. DOOR NOISE DOES NOT PREVENT COMMUNICATION. GROUNDED - YES. CLEANED DOOR SEAL AND INSPECTED AREA. FOUND LOOSE GRIP TAPE ON LEFT OUTFLOW VALVE DOOR. REMOVED LOOSE TAPE AND OPS CHECK GOOD. (REF TSR714647)

ASAA2023071344017

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#1 ENG SHOWS ENG 1 EEC C2. GROUNDED - YES. ACCOMPLISHED #1 ENG FAULT ISOLATION TASK G73-10-00-810-803FAULT ERASED, COMPLETED ENG IDLE TEST NO.32, NO FAILTS OR SMT AFTER ENG RUN.

ASAA2023071344015

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SMT MSG ENG 2 EEC C1 FAULT. GROUNDED - YES. ON DEFERRAL.

ASAA2023071344031

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HF #2 FAILED ENROUTE. GROUNDED - YES. ON DEFERRAL.

ASAA2023071344140

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TECH SERVICES REQUEST FOR FOLLOW-UP TO MTX LIGHT & FAULT(RIGHT FAMV FAULT 36-12021)----(#PRI1)----ETOPS SIGNIFICANT SYSTEM----. GROUNDED - YES. (RESOLVED ON W/O: 1962052 TASKCARD: N/R-00001 ) REMOVED AND REPLACED #2 ENG FAMV REF AMM 36-12-03. OPS CHECK GOOD, NO FAULTS FOUND. THIS CLEARS THIS TSR, SEAMC PHIL NOTIFIED.

ASAA2023071344010

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MAINT CAUTION LIGHT ILLUMINATED ON LANDING. GROUNDED - YES. EXISTING FD EFFECT PG SHOWS MSG 36-12021 ACTIVE FOR #2 ENG. REF IFIM TASK 36-12-00-810-802, PERFORMED RIGTH PNEUMATIC ENGINE ON SYSTEM TEST IAW AMM TASK 36-00-00-730-801, ALL TESTS PASSED. VERIFIED FAULT MSG 36-12021 NO LONGER ACTIVE AND NO FAULT MSG IN MAINT LIGHT PAGE.

ASAA2023071344054

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ON GROUND RIGHT FWD WINDOW HEAT AMBER OVERHEAT ILLUMINATED. GROUNDED - YES. CREW PERFORMED THE WINDOW OVERHEAT QRH, AFTER COOL DOWN PERIOD WINDOW HEATS WITCH TURNED ON AND OVERHEAT LIGHT REMAINED EXTINGUISHED FOR REMAINDER OF FLIGHT.

SWAA2023071478505

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ANTI SKID INOP LITE ILLUMINATED

ASAA2023071243998

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AFTER COMPLETING AFTER START CHECKLIST, #1 ENGINE EEC SHOWS ALTN ON EEC CONTROL SWITCH. GROUNDED - YES. OMF SHOWS MAINTENANCE MESSAGE 71-09001. ACCOMPLISHED IFIM G71-00-00-810-836. MAINT LIGHT EXTINGUISHES AND OPS NORMAL. EEC MAINT ENG 1 TEST NORMAL.

ASAA2023071243985

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ON ROLL OUT OVERHEAD MAINT LIGHT CAME ON. GROUNDED - YES. FOUND STATUS MESSAGE 21-55011 - "RIGHT AIR CONDITIONING PACK EXIT DOOR ACTUATOR HAS SIGNAL ERROR." RESET CIRCUIT BREAKER C1951 PER FIM 21-51-00. PERFORMED AIR CONDITIONING SYS TEST IBIT RIGHT REF AMM 21-00-00-730-801. NO MAINT. MESSAGE ON DISPLAY. DETERMINED TO BE AN INTERMITTENT FAULT. SEAMC DAVE NOTIFIED.

ASAA2023071244005

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HF#2 WILL NOT TRANSMIT. GROUNDED - YES. ON DEFERRAL.

ASAA2023071244002

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APU FAULT LIGHT ILLUMINATED ON START ATTEMPT. ATTEMPTED 2 STARTS. GROUNDED - YES. UPON ARRIVAL MX PERFORMED THREE SUCCESSFUL APU STARTS. ALL INDICATIONS NORMAL. SEE LOG PG 60630075 FOR MEL DEFERRAL.APU START AND OPS REF. AMM 49-11-00.

ASAA2023071244000

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TWO ATTEMPTED ENGINE STARTS ON NO. 2 ENGINE WITH NO LIGHT OFF, RIGHT IGNITOR. GROUNDED - YES. FOUND #2 ENGINE IGNITION C/B OPEN, CLOSED C/B AS REQUIRED. PERFORMED #2 ENGINE IGNITION TEST PER AMM 71-00-00, OPS CHECK GOOD.

ASAA2023071144012

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APU FAULT LIGHT OCCURS WHEN PWR IS SUPPLIED VIA EITHER APU START SW OR APU TEST MODE. FOUND MAINT MSG 49-89002 NO INPUT FROM APU ECU. APU WILL NOT START. GROUNDED - YES. ON DEFERRAL.

ASAA2023071143974

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#2 ENGINE DRIVE LIGHT NOT ILLUMINATED WITH ENGINE NOT RUNNING. GROUNDED - YES. (RESOLVED ON W/O: 1960703 TASKCARD: N/R-00003 ) REVERSED CONFIGURATION CHANGES OF MEL 24-11-01 FOR THE #2 IDG. REPLACED LAMPS IN #2 GEN DRIVE LIGHT AND #2 GEN OFF BUS LIGHT. CONFIRMED #2 GEN DRIVE LIGHT WORKS WITH PTT AND LIGHTS TEST, BUT STILL NOT ILLUMINATED WITH ENGINE NOT RUNNING. PERFORMED IFIM 24-11-00-810-804, ACCESSED CONNECTOR P103 FROM IDG DOOR, PINS 5-6 OF IDG READ OPEN REF WDM 24-11-21. REQUIRES #2 IDG CHANGE. CDANCIK 56558 07/13/2023REPLACED IDG ON #2 ENG REF AMM 24-11-11, OPS & LEAK CHECK GOODPLACARDS REMOVED, SEAMC JOE NOTIFIED. THIS CLEARS MEL.

ASAA2023071144003

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AMBER MAINT LIGHT OVERHEAD PANEL ILLUMINATED - DISCOVERED DURING PREFLIGHT. GROUNDED - YES. PACK FLOW PRIMARY R - ON STATUS MSG 21-59001 IS ACTIVE. FOUND P6-4 C/B B-11 PACK CONT RIGHT A/C "OUT" INSPECTED + RESET C/B REF MM 20-60-01 + IT STAYS IN. (DUE TO LOCATION SUSPECT BAG STRIKE). REQ A/C SYS BITE TEST OF R/H PACK SYS REF MM 21-00-00-730-801 MS 10241 07-11-2023PERFORMED L/H & R/H IBIT TEST PER TASK 46-13-02-710-801. OPS CHECK GOOD. NO FAULTS. NO HISTORY 90 DAYS.

ASAA2023071043961

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"FMC DISAGREE" ALERT DISPLAYED ON ND. GROUNDED - YES. PERFORMED IFIM 34-61-00-810-918, CYCLED FMC COMPUTER 1 (P18-2, A6) AND FMC COMPUTER 2 (P6-1, D16). FAULT CLEARED. NO HISTORY 30 DAYS.

ASAA2023071043966

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WHILE PERFORMING TASK CARD 05-020-01 FOUND NO. 2 ENG EEC ECONOMIC FAULT 77-41634 "EGT PROBE 3 VALVE DOES NOT AGREE". GROUNDED - YES. ON DEFERRAL.

ASAA2023071043960

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ALL FUNCTION OF CAPT SIDE FMC/MCDU INOP/FROZEN NO FMC FLAGS OR MAP FLAGS. GROUNDED - YES. OPENED AND CLOSED C/B'S A6 AND A7 AT P18-2 (FMCS CMPTR-1 AND FMCS CDU 1) AFTER SYSTEM RESET MCDU-1 WORKS NORMAL AND PERFORMED GOOD INSTALLATION TEST OF CAPT MCDU AS PER REF. AMM 34-61-01/401 AND AMM 34-61-02/401, NO HISTORY PREVIOUS 30 DAYS.

ASAA2023070943969

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AFTER START THE NO. 1 START VALVE OPEN LIGHT REMAINED ILLUMINATED ACCOMPANIED BY THE BLINKING ENG LIGHTS FOR 5-8 SECONDS. THIS CYCLE THEN REPEATED 5 OR 6 TIMES. SUBSEQUENTLY ALL THE LIGHTS EXTINGUISED AND ALL OTHER IDICATIONS REMAINED NORMAL. GROUNDED - YES. DUE TO RECENT HISTORY, REMOVED AND REPLACED #1 ENG STARTER AIR VALVE REF AMM 80-11-02. OPS TEST GOOD, A/C OK FOR CONTINUED SVC.

ASAA2023070943935

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SLIDE/OVERWING LIGHT ON R/H SIDE BETWEEN EMERGENCY DOORS INOP. GROUNDED - YES. REMOVED AND REPLACED SLIDE/OVERWING LAMP REF B737-9 AMM 33-51-04. LIGHT FUNCTIONS NORMALLY, NO FURTHER DEFECTS NOTED.

ASAA2023070943945

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WHILE ACCOMPLISHING T/C 05-020-01 DISCOVERED MESSAGE ENG 1 EEC C2. GROUNDED - YES. ON DEFERRAL.

ASAA2023070943946

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WHILE ACCOMPLISHING T/C 05-020-01 DISCOVERED MESSAGE ENG 2 EEC C2. GROUNDED - YES. ON DEFERRAL.

SWAA2023071177226

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DISPLAY SOURCE 1 DURING CRUISE WITH NO HYD PRESSURE INDICATION SYSTEM A

ASAA2023070843922

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SPEED TRIM ANNUNCIATOR ILLUMINATED DURING RECALL CHECK, EXTINGUISHED AFTER PRESSING MASTER CAUTION. GROUNDED - YES. LAST LEG "A" FCC LOGGED 22-11186, "B" FCC NO FAULTS. PERFORMED B737-9 IFIM 22-11-00-810-D71 W/NO FAILURES. BITE TEST FOR SPEED - STAB TRIM 60.32 PASS. ETOPS GND VERIFICATION PASS.

ASAA2023070843940

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APU FAULT ON START UP, AFTER LANDING. GROUNDED - YES. (RESOLVED ON W/O: 1961088 TASKCARD: N/R-00001 ) OPS CHECKED APU. FOUND EXCESSIVE BUBBLES IN OIL RESERVOIR SIGHT GAUGE. ALSO FOUND AN OIL LEAK AT THE TURBINE SECTION OF THE TURBINE BEARING SCAVANGE RETURN LINE. TIGHTENED B-NUT IAW AMM 20-50-11-910-801 TABLE 221. OPS CHECKED AGAIN. FOUND NO EXCESSIVE BUBBLING AND NO LEAKS. NO FUALTS FOUND. OPS CHECK GOOD. THIS CLEARS MEL 49-11-01. PLACARDS REMOVED. SEAMC MITCH NOTIFIED.

ASAA2023070843947

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GE DIAGNOSTICS REPORTS #1 ENGINE IS GENERATING ALERTS FOR PS3 OUT OF RANGE, PS3 DISAGREE FAULTS, P3B OUT OF RANGE, P3B DISAGREE FAULTS, OR P3B VS PS3 PRESSURE DISAGREE FAULTS. ICE/WATER BLOCAGE IS SUSPECT AND PSS BLOWOUT REQUIRED. GROUNDED - YES. ACCOMPLISHED PSS BLOWOUT ON THE #1 ENGINE AS PER TASK CARD 73-ASA-01. ENGINE RUN CARRIED OUT SUCCESSFULLY WITH NO FAULTS OBSERVED. THIS CLEARS TSR DEFERRAL. A/C OK FOR SERVICE.

ASAA2023070843925

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HF #2 C/B POPPED. GROUNDED - YES. REMOVED AND REPLACED #2 HF TRANSCEIVER REF B737-9 AMM 23-11-21. OPERATIONAL TEST PASS.

ASAA2023070843919

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FA REPORTS LITTLE TO NO AIRFLOW FROM PASSENGER VENTS IN ROW 6-15. ROWS 16 AND BACK AIR FLOW IS NORMAL. AT CRUISE LEFT AND RIGHT DUCT PRESSURE WAS 37 PSI. FWD CAB SELECTOR WAS TURNED ALL THE WAY DOWN COLD AND PASSENGERS IN ROW 12 HAD TO MOVE SEATS DUE TO BEING UNCOMFORTABLY WARM. GROUNDED - YES. INTERROGATED OMF FOR FAULTS. NO RELATED FAULTS NOTED. RUN PACKS WITH APU BLEED AIR. AIR FLOW IN CABIN IS NORMAL. C/W CABIN TEMP CONTROL PROBLEM (FWD PASS) FAULT ISOLATION PER FIM 21-00-00-810-834. FOUND CABIN TEMP FILTERS DIRTY. REPLACED ALL CABIN TEMP SENSOR FILTERS. C/W AIR CONDITION SYSTEM TEST, AIR CONDITIONING IBIT WITH FLOW SENSOR TEST REF AMM 21-00-00. OPS CHECK GOOD. RUN PACKS WITH APU BLEED AIR. PACKS SONE DUCT TEMP GOES BELOW 10 DEGREES C (FWD & AFT). CABIN IS GETTING COOLER ALSO ZONE TEMP CONTINUES DECREASE. NO FAULT NOTED IN OMF. NO OTHER DEFECT NOTED. NO HISTORY LAST 90 DAYS.

ASAA2023070743920

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AUTO FAIL LIGHT ILLUMINATED @ FL370 CABIN PRESSURE NORMAL. GROUNDED - YES.

ASAA2023070743941

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ATTEMPTED TWO APU STARTS AFTER LANDING IN SEA. BOTH RESULTED IN AMBER FAULT LIGHTS. GROUNDED - YES. FAULT CODE 49-41012 IS DRIVEN BY CORRELATED FAULT 49-41254 (START CONVERTER UNIT SHOWS START SYSTEM INOP). BOTH FAULTS SHOW NOT ACTIVE, PER B737-9 IFIM TASK 49-40-00-810-818, FAULTS WERE INTERMITTENT. RAN APU MULTIPLE TIMES, APU STARTS NORMALLY AND SUPPLIES POWER AND AIR NORMALLY.

ASAA2023070643906

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ENROUTE CONUS- SLC-SEA SAT PHONE AOC DIALING INOP, TRIED MULTI DESKS ON BOTH SAT 1 AND 2. ERROR MSG RCVD THE REQUESTED SERVICE IS NOT AVAILABLE. WE WERE ABLE TO RECEIVE INBOUND SAT CALLS FROM DISPATCH. GROUNDED - YES. PERFORMED SATCOM SYSTEM OPS CHECK, OPS CHECKED GOOD. WAS ABLE TO COMMUNICATE WITH DISPATCH ON SAT 1 AND SAT 2. NO ERRORS/FAULTS NOTED AT THIS TIME.

ASAA2023070643907

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ON PDC WALK AROUND FOUND #1 IDG PDI (PRESS. DIF. IND.) POPPED. GROUNDED - YES. PERFORMED IFIM TASK 24-11-00-810-805. FOUND DPI EXTENDED. PERFORMED IDG SCAVENGE AND CHARGE FILTER INSPECTION. NO DEFECTS NOTED AT THIS TIME. REPLACED IDG SCAVENGE AND CHARGE FILTERS PER AMM 24-11-41 AND SERVICED IDG OIL PER AMM 12-13-21. RECONNECTED IDG AND PERFORMED GCU BITE CHECK, OPS CHECK GOOD. DRY MOTOR #1 ENGINE FOR IDG LEAK CHECK PER AMM 71-00-00-790-802-G00, NO LEAKS FOUND. RELAMPED #1 DRIVE LIGHT AND GEN BUS LIGHT. PERFORMED ENGINE RUN ON # 1 ENG, #1 IDG OPS CHECK GOOD.

ASAA2023070643913

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TECH SERVICES FOLLOW UP ON URGENT CNR 20230706003 FOR #1 ENG (60A314) CUMULATIVE ODMS CHIP COUNT INCREASE - LOW THRESHOLD - URGENT. GROUNDED - YES. PERFORMED ODMS SENSOR INSPECTION REF AMM 79-00-00- TSR STEP 1. DEBRIS FOUND, PICTURES TAKEN AND DEBRIS COLLECTED SENT TO PP ENGINEERING. PERFORMED STEP 2-4 OF TSR, INSPECTED ALL SCAVANGE SCREEN PLUGS REF AMM 79-21-04. NO DEBRIS FOUND. INSPECTED STARTER MAG CHIP DETECTOR REF AMM 80-11-09. NO DEBRIS FOUND. REQUIRES IDLE ENG RUN LEAK CHECK. COMPLETED STEP 6, RESET #1 ENG ODMS CHIP COUNT, REF AMM 71-00-00-700-802-G00. ACCOMPLISHED IDLE LEAK CHECK OF #1 ENG ODMS SENSOR, CHIP DETECTORS, AND STARTER MAG CHIP DETECTOR, CHECKS GOOD NO LEAKS REF AMM 71-00-00. MATERIAL IDENTIFIED AS 35NCD16, DISPOSITION BY CFM AS NO MAINTENANCE ACTION REQUIRED. REF PWRPL-79EA-25823.

ASAA2023070643914

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WHEN VNAV SWITCH IS PRESSED GREEN LIGHT IN SWITCH ILLUMINATES AND "VNAV"APPEARS IN WHITE ON FMA AT TOP OF PFD'S. AFTER 3-10 SECONDS VNAV MODE TURNS OFF WITHOUT PILOT ACTION. GROUNDED - YES. ACCOMPLISH MAX DISPLAY SYS - OPERATIONAL TEST REF TASK 31-65-00-710-801 - OK. REBOOTED A/C PWR - OPS CK OK.

ASAA2023070543910

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WXR FAIL DISPLAYED WHEN RADAR IS TURNED ON - ALL MODES SELECTED ON RADAR CONTROL PANEL. GROUNDED - YES. ON GROUND OMF SHOWS NO ACTIVE FAULT RELATED TO WEATHER READAR. HOWEVER IFIM PERFOMED 34-41-00-810-836. WXR OPERATIONAL TEST PASS AIRCRAFT OK FOR SERVICE.

ASAA2023070543949

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TECH SERVICES FOLLOW UP ON GE CNR # 20230705063, #2 ENG OIL FILTER APPROACHING BYPASS. GROUNDED - YES. REMOVED AND REPLACED OIL FILTER CARTRIDGE ELEMENT REF AMM 79-21-07. NO DEBRIS/CONTAMINATION FOUND.

ASAA2023070443901

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SPEED TRIM FAIL ON RECALL, RESETS WITH MASTER CAUTION. GROUNDED - YES. FOUND FAULT CODE "22-11186" PRESENT ON FCC A FLIGHT LEG 1. ACCOMPLISHED IFIM TASK 22-11-00-810-C61. INITIAL EVALUATION PASSES.

ASAA2023070443881

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DURING PERFORMING T/C 31-005-00 W/O 1959557 FOUND "ENG 1 EEC C2" MESSAGE ON SCHEDULE MAINTENANCE TASK DISPLAY SYSTEM. GROUNDED - YES. ON DEFERRAL.

ASAA2023070443899

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DURING START ENG. NO. 1, CREW ALERTS FLASHED TWICE WITH "START VALVE " ANNUNCIATED. EXTINGUSHED WHEN STARTER SWITCH DISENGAGGED. NO ABNORMAL ENGINE INDICATIONS. GROUNDED - YES. START VALVE OPEN ALERT IS A NUISANCE FAULT NO OTHER FAULTS NOTED - REF IFIM TASK G 80-00-00-810-858.

ASAA2023070343869

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FWD L WINDOW OVERHEAT. GROUNDED - YES. RESET PER QRH. OVERHEAT LIGHT REMAINED EXTINGUISHED.

ASAA2023070343876

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FMC ENG SOFTWARE DOES NOT SELECT APPROPRIATE SETTING IN CRZ - AUTO. POSSIBLE SOFTWARE LOAD PROBLEM. GROUNDED - YES. FMC SOFTWARE CONFIGURATION CHECK FAILS. DEFAULT LDDB WAS LOADED INTO BOTH FMC'S. LOADED THE CORRECT LDDB REF MM 34-61-00/201 AND VERIFIED FMCS PERFORMANCE FACTORS REF MM 34-61-00-750-803. ALL SETTINGS NORMAL.

ASAA2023070343863

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MCP PANEL IS BLANK. GROUNDED - YES. RE-POWERED A/C OPS TEST MODE CNTRL PANEL OPS NORMAL REF B737-9 IFIM 22-10-00, GRND VERIFICATION SUCCESSFUL.

ASAA2023070343867

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SAT CALL INOP. GROUNDED - YES. ON DEFERRAL.

ASAA2023070343885

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NEAR END OF START CYCLE OF ENG NO 1 ALL 5 ENGINE ALERT BOXES FLASHED FOR APPR 5 SEC WITH START VALVE BOX ANNUNCIATED. FLASHING STOPPED AND ALL BOXES CLEARED ON THEIR OWN WHEN START VALVE CLOSED. NO OTHER ABNORMAL ENGINE INDICATIONS OR ANNUNSIATIONS. GROUNDED - YES. REPLACED #1 ENG STARTER AIR VALVE REF MM 80-11-02. LK AND OPS CK GOOD.

ASAA2023070243877

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WHILE IN FLIGHT, LEFT FMC FAILED. CAPTAIN'S NAV DISPLAY SHOWED VTK FLAG. NO FMC DATA WAS ON CAPTAIN'S NAV DISPLAY MAP MODE. FMC DATA WAS LOST ON BOTH CDUS. AFTER 30 SECONDS, SYSTEM RESUMED NORMAL OPERATION. GROUNDED - YES. RESET FMC'S REF IFIM TASK 34-61-00-810-918. ALL FAULTS CLEARED. NO FURTHER DEFECTS NOTED.

ASAA2023070243874

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MOMENTARY FMC RIGHT FAIL RECOVERED ON ITS OWN. GROUNDED - YES. CYCLED FMCS COMPUTER 1/2 CB REF B737-9 IFIM 34-61-00-810-918FAULT CLEARED. OPS CHK GOOD.

ASAA2023070143837

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R-1 WINDOW OVHT LIGHT ILLUMINATED ON GROUND IN SFO, FOLLOWED QRH AND LIGHT STAYED OUT. GROUNDED - YES. ALL INDICATIONS NML. OPS NML IAW B737-9 AMM 30-41-00.

ASAA2023070143849

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WHILE PERFORMING T/C 31-005-00 FOUND SMT SHORT TIME FAULT ENG 2 EEC C1. FAULT CODE 73245152, CORRELATED MAINT MSG. 73-43984 & 73-43855. GROUNDED - YES. NEITHER FAULT ACTIVE. 73-43855 OCCURRED ON LEGS 5, 6, 16, AND 18. ACCOMPLISHED B737-9 IFIM TASK G73-20-00-810 REMOVED, SMT FAULT ERASED. NO DEFECTS NOTED. 73-43984 OCCURRED ON LEGS 12 AND 17. TEST 32 PASSED REF IFIM G73-20-00-810-928. SMT FAULT ERASED.

ASAA2023070143847

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WHILE ACCOMPLISHING T/C 72-ASA-03. ENGINE CLEANING, THE LOCK BOLT ON HPSOV CAME OUT WITH HELI-COIL ATTACHED. GROUNDED - YES. REMOVED AND REPLACED HPSOV VALVE ASSY PER B737-AMM 36-11-07/401. FOR # 2 ENGINE. OPS TEST/CHECK GOOD.

ASAA2023063043855

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AFTER START WHEN PROBE HEAT TURNED ON, "F/O' PITOT" LIGHT REMAINED ILLUMINATED. GROUNDED - YES. REMOVED & REPLACED F/O PITOT PROBE. ALL TESTS PASS. REF B737-9 AMM 34-11-01.

ASAA2023063043824

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OVHD MAINT LIGHT ILLUMINATED. GROUNDED - YES. REMOVED AND REPLACED LEFT PACK TEMP CONTROL VALVE, REF B737-9 AMM 21-51-10-400-801, OPS/LEAK CHECK GOOD.

ASAA2023063043842

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CPDLC WILL NOT ACCEPT CONFIRMATION MESSAGE RESULTING IN "OPEN" ATC MESSAGE. WORKED ON THE GROUND WHEN ACCEPTING PRE DEPARTURE CLEARANCE. AFTER ATTEMPTING TO RE-LOGIN, IT TOOK APPROXIMATELY 10 MINS FOR ATC TO ACCEPT LOGIN. GROUNDED - YES. RESET CPDLC SYS PER B737-9 AMM 34-61-00-800-899 PERFORMED FUNCTIOAL TEST OF CPDLC SYS PER B737-9 AMM 34-61-00-720-899 TEST OK.

ASAA2023062943799

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L SIDE WINDOW (L2 WINDOW) OVERHEAT LIGHT ILLUMINATED IN CRUISE. PER QRH HEAT SELECTED OFF FOR 5 MINUTES, THEN BACK ON. NORMAL OPERATION THEREAFTER. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM TASK 30-41-00-41-00-810-835. INITIAL EVALUATION PASSES.

ASAA2023062943838

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LEFT SIDE WINDOW OVERHEAT LIGHT ILLUMINATED AT CRZ. GROUNDED - YES. RESET PER QRH PROCEDURE LIGHT WENT OUT AND REMAINED EXTINGUISHED.

ASAA2023062943839

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LEFT SIDE WINDOW OVERHEAT LIGHT ILLUMINATED DURING CRZ. FOLLOWED QRH PROCEDURE & LIGHT EXTINGUISHED, THEN REILLUMINATED. GROUNDED - YES. OPS CHECK PERFORMED IAW B737-9 AMM 30-41-00-710-801 AND AMM 30-41-11-710-801 FOUND GOOD AT THIS TIME. LEFT SIDE SLIDE WINDOW GOT HOT AND RELATED SWITCH STAYED ON FOR 30 MIN NO OVERHEAT LIGHT ILLUMINATED.

ASAA2023062943804

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BLEED FAMV RVDT L FAULT CODE 36145241 FOUND #1 ENGINE. GROUNDED - YES. ON DEFERRAL.

CALA2023063002112

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TAKEOFF CONFIG WARNING ACCOMPANIED BY HIGH SPEED REJECT FLIGHT DECK EFFECT SHOWS NO 4 FLAP SENSOR DISAGREEMENT INFO PER FIM TASK 27-81-00-810-829 ACCOMPLISHED INITIAL EVALUATION 27-51-00-740-801. OMF SHOWS NOT ACTIVE FOR MAINTENANCE MESSAGE STEPS. ACCOMPLISHED LEADING EDGE FLAP AND SLAT SYSTEM OPERATION 27-81223. PER FIM FAULT WAS INTERMITTANT. WITH PRIMARY CONTROL, AMM TASK 27-81-00-860-801 AND ACCOMPLISHED FSEU DISPLAY AND EXISTING FAULTS TEST, AMM TASK

ASAA2023062943802

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FMC DISAGREE. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM 34-61-00-810-918. OPS CHECK NORMAL. DUAL FMC OPS RESTORED.

ASAA2023062943841

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TO GET A NORMAL RADAR RETURN IN AUTO OR MANUAL, GAIN NEEDS TO BE IN THE MAX POSITION. GROUNDED - YES. MDS OMF INDICATES NO FAILURES. ACCOMPLISHED WEATHER RADAR OPERATIONAL TEST W/ NO FAILURES INDICATED. ACCOMPLISHED GPWS OPERATIONAL TEST OBSERVING CORRECT WINDSHEAR ANNUNCIATIONS. CONFIRMED WXR PANEL GAIN CHANGE OUT OF 12 O'CLOCK IS REFLECTED ON NAV DISPLAY. REF B737-9 AMM 34-41-00. ETOPS GROUND VERIFICATION SUCCESSFUL.

ASAA2023062943812

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WHILE ACCOMPLISHING T/C 05-020-01 DISCOVERED (SMT) MESSAGE ENG 2 EEC C2. GROUNDED - YES. ON DEFERRAL.

ASAA2023062943813

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WHILE PERFORMING T/C 31-005-00 FOUND SMT SHORT TIME FAULT ENG 2EEC C1. GROUNDED - YES. ON DEFERRAL.

ASAA2023062943805

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TWO APU START ATTEMPTS RESULTED IN APU FAULT LIGHT ILLUMINATION. GROUNDED - YES. PER B737-9 FIM TASK 49-40-00-810-818 VERIFIED NO VISUAL DAMAGES TO STARTER AND CANNON PLUG ATTACHING. AFTER FURTHER INVESTIGATION, DELTA P POPPED ON LUBE MODULE FILTER. REMOVED AND REPLACED LUBE MODULE FILTERS. FOR PRECAUTIONARY MEASURES REMOVED & INSPECTED CHIP DETECTOR FOR CHIPS. NO CHIPS FOUND. REMOVED, INSPECTED AND REPLACED STARTER GENERATOR FILTER. NO PARTICULATES FOUND. OPS CHECK START APU 5 TIMES. OPS CHECK GOOD. LEAK CHECK GOOD. IAW B737-9 AMM 49-91-81; 49-91-12. THIS CLEARS MEL 49-11-01.

ASAA2023062943803

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#2 ENG PNEUMATIC HPSOV LOCK COLLAR THREADED INSERT PULLED OUT. GROUNDED - YES. REMOVE HPSOV #2 ENG REF B737-9 AMM TASK 36-11-07-000-80 INSTALL HPSOV REF AMM TASK 36-11-07-400-801. OPS & LEAK CK GOOD, NO STATUS MSG OR MAINT LIGHT. REF AMM 36-11-07-400-801.

ASAA2023062943845

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AFTER LANDING, THE MASTER CAUTION AND AMBER "MAINT" LIGHT ON THE OVERHEAD PANEL ILLUMINATED. GROUNDED - YES. UPON NAVIGATING ONBOARD MTX COMPUTER FOUND CORRELATED FAULT CODE 36-12-12021 (#2 ENGINE) BLEED FAMV R. PLACED ON MEL 36-12-01A. REMOVED AND REPLACED RH FAN AIR MODULATING VALVE IN REF TO B737-9 AMM 36-12-03. ALSO PERFORMED OPS CHECK AND LRU TEST PER AMM 36-00-00-730-801 AND BOTH OPS CHECKED GOOD.

CALA2023063002090

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NUMBER 1 ENGINE OVERHEAT WARNING ON TAXI IN. SHUT DOWN ENGINE/PU LLED FIRE HANDLE/BLEW 1 BOT. UPON ARRIVAL FOUND FUEL DRIPPING FROM #1 ENGINE CORE AREA, OPENED COWLS AND FOUND EXTENSIVE FIRE DAMAGE TO LEFT SIDE OF ENGINE HOT SECTION. UNABLE TO IDENTIFY SOURCE OF FUEL LEAK AT THIS TIME. NEEDS FURTHER EVALUATION. REMOVED AND REPLACED ENG#1 AND ALSO REPLACED ENG #1 FIRE EXTINGUSHING BOTTLE DUE TO BEING USED, OP CHECK TEST GOOD.ROTABLE PARTS CHANGE WAS INDICATED - TT # 1868474 SN OFF 0467 ENGINE, BASIC, OFF 42-7200-9-0001 0467 ON 42-7200-9-0001 3512. BOTTLE, FIRE, E OFF 42-2621-9-0001 6861 ON 42-2621-9-0001 0441.

ASAA2023062843801

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WX RADAR FAILED INFLIGHT BOTH NDS. GROUNDED - YES. PERFORMED OPERATIONAL TEST OF WEATHER RADAR, IAW B737-9 AMM 34-41-00-710-841. OPS CHK GOOD ON GROUND.

ASAA2023062843783

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WHILE PERFORMING MTC 31-005-00 FOUND SMT MESSAGE ENG 1 EEC C2 UNDER LATCHED MESSAGE ERASE. GROUNDED - YES. C/W IFIM TASK G73-10-00-810-803. LATCHED MESSAGE ENG 1 EEC C2 ERASED AND DID NOT REAPPEAR.

ASAA2023062843797

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FWD AND AFT TEMP CONTROLS NEED TO BE ON FULL COLD TO GET ACCEPTABLE CABIN TEMP. DUCT AND CABIN TEMP GAUGES APPEAR NORMAL. FLIGHT DECK CONTROLS AND INDICATIONS NORMAL. GROUNDED - YES. PERFORMED PRESENT FAULTS CHECK AND FOUND CODE 21-55011 R/H RAM AIR DOOR ACTUATOR SIGNAL ERROR. PERFORMED B737-9 IFIM 21-51-00-810-804 WITH NO FAULTS FOUND. FAULT NOT ACTIVE.

ASAA2023062743793

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WHILE PERFORMING T/C 31-005-00, FOUND SMT MESSAGE "BLEED FAMV RVDT R". GROUNDED - YES. ON DEFERRAL.

ASAA2023062743763

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PILOT RPTS APU FAULT LT ILLUMINATES ON START, APU WON'T START. GROUNDED - YES. PFMD FULL POWER RESET OF A/C SUSPECT BATTERY SWITCH TURNED OFF BEFORE 2 MIN SHUTDOWN. NO FAULTS FND ON START UP REF IFIM 31-00-00-810-803.

ASAA2023062743778

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WHILE ACCOMPLISHING T/C 05-020-01 FOUND NOT ACTIVE FAULT 71-43692 ENG STALLED DURING START ON ENG 1. GROUNDED - YES. FOLLOWING IFIM TASK G-71-00-00-810-870 NO CREW REPORTS AND ENG EGT START LIMIT WAS NOT EXCEEDED. VERIFIED WITH TECH SERVICES THAT EGT LIMIT WAS NOT EXCEEDED. AS PRECAUTION PERFORMED TEST 32 ENG IDLE SYS TEST. TEST PASSED AND ENG RUN NUMEROUS TIMES WHILE ACCOMPLISHING ENG WASH. NO PRIOR HISTORY, GOOD FOR SERVICE.

ASAA2023062743769

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DURING WO 1959098 T/C 31-005-00 FOUND SMT MESSAGE ENG 1 EEC C2. GROUNDED - YES. PERFORMED IFIM TASK G73-10-00-810-803 WITH NO CORRELATED MX MESSAGES FOUND. PERFORMED TO BE INTERMITTENT FAULT. PERFORMED GROUND VERIFICATION TEST NO. 32 AMM G71-00-00. OPS CK GOOD. TEST PASS. NO FAULTS FOUND.

ASAA2023062743807

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SCHEDULED MAINTENANCE TASK MESSAGE " ENG 1 EEC C2 " OBSERVED. GROUNDED - YES. ON DEFERRAL.