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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ASAA2023052843379

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IN CRUISE FL350 HAD DUAL FMC FAILURE. HAD AP P/RST AND FMC P/RST LIGHTS FLASHING ON GLARE SHIELD. WHILE GETTING QRH OUT, BOTH FMC'S RESET AND RETURNED TO NORMAL OPERATION. CPDLC ALSO LOGGED OFF. NORMAL OPS FOR THE REMAINDER OF THE FLIGHT. GROUNDED - YES. PERFORMED OPS CHECK OF FMC OPERATIONAL TEST IAW B737-9 AMM 34-61-00. OPS CHECK GOOD. NO DEFECTS NOTED AT THIS TIME.

ASAA2023052843385

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APU FAULT LIGHT ON FIRST START ATTEMPT ON TAXI IN, WAITED 5 MINUTES, FAULT CLEARED, SUCCESSFUL START ON ATTEMPT #2. GROUNDED - YES. PERFORMED TROUBLESHOOTING & FOUND MAINTENANCE MESSAGE 49-41012 NO APU ROTATION SHUTDOWN & 49-41254 START CONVERTER UNIT SHOWS START SYSTEM INOP. PERFORMED B737-9 IFIM TASK 49-40-00-810-805 STEPS 1 & 2. MESSAGES SHOW AS NOT ACTIVE & NO PREVIOUS HISTORY ON A/C. COMPLETED APU START WITH NO FAULTS NOTED NOTED. FAULTS ARE INTERMITTENT.

ASAA2023052743369

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AFTER PRESSING RECALL THE SPEED TRIM FAIL LIGHT ILLUMINATED THE LIGHT EXTINGUISHED WITH THE MASTER CAUTION RESET. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM TASK 22-11-00-810-D71 AND IFIM TASK 22-11-00-810-C61 ALSO ACCOMPLISHED DFCS BITE LIBRARY TEST. ALL TESTS PASSED.

ASAA2023052643404

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SCHEDULED MAINTENANCE TASK DISPLAY SYSTEM HAS LATCHED MESSAGE BLEED PM SENSOR 1L WHILE COMPLETING ASA T/C 31-005-00, MAINT MESSAGE 36-21020 ENGINE 1. GROUNDED - YES. ON DEFERRAL.

ASAA2023052643377

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WX RADAR DEPICTS A RETURN FROM THE NOSE TO END OF RANGE THAT IS CONSISTENTLY POINTED 20* DEGREES LEFT OF NOSE. GROUNDED - YES. PERFORMED SYSTEM RESET OF THE WXR SYSTEM PERFORMED WEATHER RADAR OPERATIONAL TEST IAW B737-9 AMM 34-41-00. OPS CK GOOD. ALL INDICATIONS WORK NORMAL. NO INBOUND FLIGHT DECK EFFECTS NOR INOP STATUS MSG.

ASAA2023052643381

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INTERMITTENT DUAL FMC FAIL AT FL 390. LASTED ABOUT 60 SEC THEN RECOVERED. GROUNDED - YES. VERIFIED FMC FAILED R/H FMC PRES POS LAT RATE & L/H FMC HAD CDU R RATE BOTH ARE INTERMITTENT. CYCLED BOTH FMC COMP. ACCOMPLISHED SENSOR STATUS TEST BOTH PASS TEST REF B737-9 AMM 34-61-00-710-002.

ASAA2023052543407

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WHILE PERFORMING ASA T.C. #31-005-00, SMT HAS LATCHED MTX MSG BLEED FAMV RVDT L. GROUNDED - YES. PERFORMED B737-9 FIM TASK 36-12-00-810-803 FOR MTX MSG BLEED FAMV RVDT L. MESSAGE WAS FOUND TO BE AN INTERMITTENT FAULT.

ASAA2023052543394

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DURING ENGINE START ON #2 ENGINE HERE WAS NO IGNITION ON THE LEFT IGNITER. GROUNDED - YES. REMOEVD AND REPLACED LH IGNITOR ON #2 ENG. OPS CHECK OF EEC CHANNEL A AND B IGNITOR SYS GOOD. REF B737-9 AMM 74-21-02/401 FOR WORK COMPLETED.

ASAA2023052543391

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#2 ENGINE FAILED TO START. HUNG START AFTER MOTORING FUEL FLOW WAS INTRODUCED AT 0.24 FOR 5-10 SECONDS THEN WENT TO ZERO. GROUNDED - YES. REMOVED AND REPLACED LEFT IGNITION EXCITER, LEFT IGNITER PLUG AND LEFT IGNITION LEAD ON #2 ENGINE PER B737-9 AMM 74-11-01 AND AMM 74-21-02 OPS CHECK GOOD. GROUND RUN VERIFICATION FOR #2 ENG START GOOD.

ASAA2023052543366

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AFTER LANDING MAINT LIGHT ILLUMINATED. GROUNDED - YES. INTERROGATED SYSTEM HAD CODE 74-42515 AND 74-42565 DISPLAYED. ACCOMPLISHED B737-9 FIM TASK G741-00-00-810-830. ASSOCIATED FAULTS RESET, NORMAL INDICATION, MAINT LIGHT EXTINGUISHED.

ASAA2023052443340

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NOTICED IN CRUISE FLIGHT BOTH LEFT AND RIGHT SPAR VALVE CLOSED LIGHTS WERE ILLUMINATED. WE THEN CHECKED CIRCUIT BREAKERS AND FOUND BOTH SPAR VALVE ENGINE 1 AND 2 WERE TRIPPED. GROUNDED - YES. FLT CREW COULD NOT CONFIRM THAT C/B'S WERE HIT BY SEAT BELT OR FLT BAG. INSPECTED C/B C359 AND ASSOC WIRING BEHIND P6-3 PANEL NO DEFECTS FOUND. INSPECTED #1 ENG SPAR VALVE V37 AND CONN D788, NO DEFECTS RESET C/B C359 PER B737-9 AMM 20-60-01 AND PERFORMED OPS CKS OF #1 ENG SPAR VALVE REF AMM 28-22-00-710-810 C/B REMAINED CLOSED. INSPECTED C/B C540 REF B737-9 WDM 28-22-11 NO DEFECTS NOTED, INSPECTED CONNECTOR D790 AND V38 REF WDM 28-221-11, NO DEFECTS NOTED. RESET C/B C540 REF AMM 20-60-01, ACCOMPLISHED OPS CK OF #2 SPAR VALVE REF AMM 28-22-00-710-810 ALL GND TESTS PASSED, NO HISTORY 30 DAYS. RAN #1 AND #2 ENGINES AND BOTH SPAR VALVES OPS NORMAL C/B'S REMAINED CLOSED, ALL GROUND FUNCTIONAL TESTS PASSED.

ASAA2023052343341

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WINDOW R2 "OVERHEAT" ILLUMINATED AFTER PUSHBACK DURING ENGINE START. GROUNDED - YES. ASA 737MAX QRH PROCEDURE FOLLOWED AND RECTIFIED CONDITION.

ASAA2023052343717

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DEFLECTOR CRACKS BEYOND LIMITS OF T.C # 72-220-00 #1 ENG ESN 603836 REF SUB TASK 72-00-00-211-007-G00 STEP 2 OF TASK CARD. GROUNDED - YES. PERFORMED TC PWRPL-72EA-25689-1. ACCOMPLISHED TC 72-220-00 FOR RE-EVALUATION AND AMM SUBTASK 72-00-00-211-G00. CONTINUE IN SERVICE FOR 250 CYCLES REF. AMM SUBTASK 72-00-00-211-007-G00 STEP (C)2)A) SEAMC DARWIN NOTIFIED CN#30007918

SWAA2023052551463

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CRACK/PUNCTURE ON ENGINE #2 INLET

ASAA2023052243311

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SPEED TRIM FAIL LIGHT ILLUMINATES DURING MASTER CAUTION RECALL AND EXTINGUISHES DURING MASTER CAUTION RESET. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM 22-11-00-810-D71. FOUND FAULT MAINTENANCE MESSAGE 22-11186 LEG1. ACCOMPLISHED IFIM 22-11-00-810-C61. AUTOTEST PASSED. SURFACE TEST "SPEED /STAB TRIM" TEST NO 60.32 PASSED. NO FAULTS.

ASAA2023052243315

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JUST AFTER CP, WHILE ENROUTE, EXPERIENCE A DUAL FMC FAILURE. MAP DISPLAY DISAPPEARED. LNAV/VNAV DISENGAGED AND VTK FAILURE FLAG ON BOTH SIDES AFTER APPROXIMATELY 30 SECONDS, FMC WAS RESTORED ON BOTH SIDES. GROUNDED - YES. C/W OPS CHECK OF BOTH FMC'S IAW B737-9 AMM 34-61-00-710-801. OPS CHECK GOOD.

ASAA2023052243312

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AT CRUISE AFTER EXPERIENCING A SLIGHT WAVE WITH AUTOPILOT ON, PITCH TRIM CONTINUED TRIMMING UP THEN DOWN UNTIL A/P WAS TURNED OFF. GROUNDED - YES. REMOVED AND REPLACED FCC-B, REF B737-9 AMM 22-11-33.

ASAA2023052243393

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WHILE PERFORMING ASA T/C 05-020-01 FOUND SMT MSG ENG 2 EEC C1 SHORT TIME FAULT MSG. GROUNDED - YES. FOUND ENG 2 EEC C1 SMT MESSAGE AND ACCOMPLISHED B737-9 IFIM TASK G73-20-00-810-856 AND CORRELATED BLEED FAMV RVDT R MESSAGE 36-12031 AND IFIM 36-12-00-810-804 ALL FAULTS CLEARED NO ACTIVE FAULT THIS TIME.

ASAA2023052143344

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WHILE ACCOMPLISHING ASA T/C 31-005-00, FOUND MAINTENANCE MESSAGE "BLEED FAMV RVDT L" WITH CORRELATED FAULT CODE 36-12030. GROUNDED - YES. PERFORMED ELECTRICAL LRU - REPLACEMENT TEST REF B737-9 AMM 36-00-00/501 TASK 36-00-00-710-801 AND TEST PASSED. NO FAULT CODES AND NO DEFECTS NOTED.

CALA2023052401620

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HEARD THUNK ON TAKEOFF THEN FO AIRPEED AND ALTIMETER BECAME UNR ELIABLE QRH RAN PERFORMED VISUAL INSPECTION OF PITOT PROBE AND FOUND EVIDENCE OF ADDING MORE PICS POSSIBLE BIRD STRIKE. PICS ADDED. ANY DEBRIS. NO DEBRIS PRESENT. USED NITROGEN TO FLUSH THE PITOT LINE FROM THE ADM OUT TO THE PROBE CONNECTION REF AMM 34-11-00-170-802. PARTS USED: 29-3411-9-9001,QTY :1 60-3411-3-0001,QTY :1 EVIDENCE OF BIRD STRIKE WAS AROUND F/O PITOT PROBE. CLEANED PROBE AND AIRCRAFT TO REMOVE EXTERNAL DEBRIS. INSPECTED F/O PITOT PROBE FOR BLOCKAGE. DEBRIS COULD BE SEEN INSIDE THE PROBE. REMOVED PROBE IAW AMM 34-11-01-000-801 AND INSPECTED LINE FOR ADD EMP:U371177 NO DEBRIS WAS EXPELLED. INSTALLED NEW PITOT PROBE IAW AMM 34-11-01-400-801. SEALED THE BOLTS ON THE PROBE. PROBE HEAT OPS CHECKED GOOD. PERFORMED LEAK CHECK AND F/O PITOT SYSTEM DID NOT LEAK. REF AMM 34-11-00-790-807 ADD EMP:U371177 VERIFIED INSTALLATION, PITOT TUBE CONNECTIONS, AND LEAK CHECK IAW AMM 34-11-01, 34-11-00, AND GMM09-10-05-34. NO LEAKS NOTED AT THIS TIME. (IDT)

ASAA2023052043297

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FMC DISAGREE MESSAGE ON BOTH ND'S. GROUNDED - YES. PERFORMED B737-9 IFIM 34-61-00-810-918. 1 EA C/B ON P18-2 & 1 EA ON P6-1 OPENED, RESET. FMC DISAGREE MESSAGE CLEARED. ETOPS GND VERIFICATION TEST PASS.

ASAA2023051943299

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MOMENTARY ILLUMINATION OF VTK ON FO'S NAV DISPLAY, OCCURRED TWICE, EACH LASTING (2) SECONDS. GROUNDED - YES. NO ACTIVE MSG ON OMF; OMF SHOWS MSG 31-00242 AND 31-00372, WHICH ARE NOT ACTIVE PER B737-9 IFIM TASK 31-65-00-810-860 THE FAULT WAS INTERMITTENT. PERFORMED BITE ON FMC CDU FOR FMC FOUND INFLIGHT FAULT ON LEG 8 R FMC HAS NO INPUT. PERFORMED GOOD OPS TEST FOR FMC. REF B737-9 AMM 34-61-00-710-801.

ASAA2023051943304

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APU FAULT LIGHT ILLUMINATED AFTER START ATTEMPT. SELECTED APU SWITCH OFF THE FAULT LIGHT WENT OUT. ATTEMPTED A SECOND START WITH THE SAME RESULT. FAULT LIGHT ILLUMINATED. GROUNDED - YES. REPLACED APU SCU. REF B737-9 AMM 49-41-61.

ASAA2023051843263

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SINGLE FMC AND FO MAP FLAG ON NAV DISPLAY. GROUNDED - YES. VERIFIED - NO CURRENT FAULTS ON EITHER FMC , NO FAULTS ON STATUS PAGE OF OMF. CYCLED OVERHEAD FMC SW FROM NML POSITION TO BOTH ON LEFT/RIGHT BACK TO NORMAL - ALL FMC FLAGS GONE. ALL INDICATIONS NML. NO HISTORY LAST 90 DAYS. OPS NML REF. B737-9 AMM 34-61-00.

ASAA2023051843302

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ENG #1 WILL NOT START AFTER START LEVER POSITIONED TO IDLE-NO EGT LIGHT OFF AFTER 15 SECONDS ENG IGNITION SWITCH WAS IN THE R POSITION. GROUNDED - YES. REMOVED AND REPLACED R/H AND L/H #1 ENGINE IGNITER PLGS IAW B737-9 AMM 74-21-02 PERFORMED OPS CHECK OK.

ASAA2023051843295

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FO'S MFD NOT DISPLAYING ROUT UNTIL CYCLING FMC SWITH TO BOTH ON L. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM 34-61-00 L & R FMC OPS CHECK NORMAL.

ASAA2023051843298

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FMC DISAGREE ON THE GROUND, QRH PROCEDURE ACCOMPLISHED WITH SATISFACTORY RESULT. GROUNDED - YES. PERFORMED B737-9 IFIM 34-61-00-810-918, NO FAULT. PERFORMED GOOD OPERATIONAL TEST. REF B737-9 AMM 34-61-00-710-810.

ASAA2023051743264

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DURING WALK AROUND FOUND STATUS MSG "BLEED FAN VALVE" WITH ASSOCIATED WITH "MAINT" LIGHT ON... MAINT FAULT CODE 36-12020. GROUNDED - YES. REPLACED #1 ENG FAMV REF B737-9 AMM 36-12-03 ACCOMP.

ASAA2023051643246

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AFTER LANDING "MAINT" ILLUMINATES DURING TAXI. GROUNDED - YES. FOUND FAULT CODE 36-12020 FAN AIR MODULATING VALVE NOT IN COMMANDED POSITION. ACCOMPLISHED B737-9 IFIM 36-12-00-810-801 LRU TEST PASS NO FAULTS FOUND AFTER TEST. INTERMITTENT FAULT.

ASAA2023051543303

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#1 ENGINE IS ALERTING FOR OIL FILTER DELTA PRESSURE INCREASE AND APPROACHING OIL FILTER BYPASS INDICATION. GROUNDED - YES. PERFORMED STEPS 1-4 OF ASA TSR, FOUND NO ATA 79 FAULT MESSAGES, BUT FOUND SMALL METALLIC DEBRIS IN OIL FILTER ELEMENT. REMOVED AND REPLACED #1 ENG OIL FILTER PER B737-9 AMM 79-21-07. CONTINUED WITH TSR STEPS 5-7 WITH NO CONTAMINATION/DEBRIS NOTED. PERFORMED LEAK CHECK ON #1 ENG OIL FILTER COVER, SCAVENGE SCREENS, STARTER CHIP DETECTOR AND ODMS SENSOR WITH NO LEAKS NOTED. ODMS CHIP COUNT SHOWS 4 AND REQUIRES TO BE RESET PER AMM 79-00-00-210-804-G00. ACCOMP. #1 ENG CHIP COUNT RESET, REF AMM 71-00-00-700-802-G00.

SWAA2023051948827

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R1 WINDSHIELD SHATTERED AT CRUISE.

ASAA2023051443254

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ENG #2 FWD FUEL PUMP "LOW PRESSURE" LIGHT DID NOT ILLUMINATE UNTIL SEVERAL MINUTES AFTER SHUTDOWN WITH FUEL PUMP SWITCH POSITIONED OFF. GROUNDED - YES. C/W ENG 2 FWD MAIN TANK FUEL PRESSURE SWITCHES INSTALLATION TEST REF B737-9 AMM TASK 28-42-11-420-801, OPS CHECK GOOD. NOTE: SWITCH TO THE ON POSITION, LIGHT GOES OFF IN 15 SECONDS OR LESS, FUEL PUMPS FWD/FUEL PUMPS AFT 1 OR 2 SWITCH TO THE OFF POSITION. LOW PRESSURE LIGHT COMES ON. THERE IS NO SPECIFIED TIME REQUIREMENT FOR HOW LONG IT TAKES TO COME ON. HOWEVER DURING TESTS FOUND THE LOW PRESS LIGHT COMES ON IMMEDIATELY WHEN SWITCH IS TURNED OFF. GVI OF THE PRESSURE SWITCH, CONNECTORS, REPOSITIONED BACK SHELL FOR BETTER STRAIN RELIEF. NO DEFECTS NOTED ON INSPECTION.

ASAA2023051443230

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WEATHER RADAR FAIL. GROUNDED - YES. C/W B737-9 IFIM TEST 31-00-00-010-803. FOUND OBSERVED FAULT 34-33-0731 AND 34-33-073-0732 WXR FAIL FLAG ON CAPT NAV DISPLAY WITH MAINT MESSAGE 34-43100 WXR PROCESSOR 1 INT FAULT. C/W WXR OP TEST PER B737-9 AMM 34-41-00-710-801. OP TEST GOOD WXR FAIL FLAG REMOVED ON CAPT ND.

ASAA2023051443219

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FMC DISAGREE MSG, F/O SIDE NO DATA. GROUNDED - YES. PERFORMED B737-9 IFIM TASK 34-61-00-810-918 FAULT CLEARED OPS TEST OK.

ASAA2023051243233

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APU FAULT LIGHT ILLUMINATED DURING APU START. GROUNDED - YES. WHILE DOING AN EXISTING FAULT CHECK OF THE APU IN REF TO B737-9 AMM 46-13-02. FOUND NO CURRENT OR EXISTING FAULT HISTORY FOR THE APU. ALSO COMPLETED THE BITE CHECK FOR APU IN REF TO AMM 49-61-00. DID THE OPERATIONAL CHECK OF THE APU TWO TIMES RUNNING CONCURRENT AND FOR FIVE MINUTES EACH AND NO FAULT OCCURRED.

ASAA2023051143200

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SPEED TRIM FAIL LIGHT ILLUMINATED. GROUNDED - YES. REF B737-9 IFIM 22-11-00-810-D73. ONCE A/C WAS PROPERLY ALIGNED, SPEED TRIM FAIL LT EXTINGUISHED. THIS IS NORMAL. NO FURTHER ACTION REQ'D.

ASAA2023051143201

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AUTOTHROTTLE ARM SWITCH DISCONNECTED DURING CLIMB & CRUISE FLIGHT. GROUNDED - YES. REPLACED RH AUTO-THROTTLE SERVO MOTOR REF B737-9 AMM 22-31-91/401.

ASAA2023051143218

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FMC DISAGREE THEN DISAPPEARED. GROUNDED - YES. PERFORMED GOOD OPS TEST OF FMC REF B737-9 AMM 34-61-00-710-801.

ASAA2023051143206

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ON PREFLIGHT RIGHT FORWARD WINDSHIELD OVERHEAT LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED B737-9 IFIM 30-41-00-810-829, NO FAULTS LAST LEG. R1 SYSTEM OPS AND BITE NORMAL.

ASAA2023051143223

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ENG 2 NO ENG START ON L IGN SYSTEM. GROUNDED - YES. REMOVED & REPLACED LH SIDE IGNITER OF ENG #2 REF B737-9 AMM 74-21-02.

ASAA2023051043199

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SPEED TRIM FAIL LIGHT ILLUMINATED DURING MASTER CAUTION RECALL LIGHT EXTINGUISHED WITH MASTER CAUTION RESET. GROUNDED - YES. PERFORMED B737-9 FIM TASK 22-11-00-810-D71. OPS CK GOOD, NO FAULTS DISPLAYED.

ASAA2023051043207

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ON LANDING GOT OVERHEAD MASTER CAUTION AND MAINTENANCE LIGHT REMAINED ON THRU TAXI & AFTER SHUTDOWN. GROUNDED - YES. REMOVED AND REPLACED FAN AIR MODULATING VALVE REF B737-9 AMM 36-12-03-400-801.

ASAA2023050943194

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MAINT LIGHT ON AFTER LANDING. GROUNDED - YES. CK'D AND FOUND FAULT MSG 73-41401-ENG 1 EEC CHANNEL A NO ARINC-429 INPUT. ACCOMPLISHED EEC TEST ON # 1 ENG TEST PASSED NO FAULT NOTED MAINT LIGHT OUT. REF B737-9 IFIM TASK 73-20-00-810-805.

ASAA2023050843187

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SPEED TRIM FAIL LIGHT DURING MASTER CAUTION RECALL, EXTINGUISHES WHEN MC RESET. GROUNDED - YES. C/W SPEED TRIM FAIL LIGHT B737-9 IFIM TASK 22-11-00-810-D71 AND EFCS BITE PROCEDURE PER B737-9 AMM 22-11-00-740-814 AUTO TEST PASSED FAULT LIGHT EXTINGUISHED.

ASAA2023050843174

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ATTEMPTED TO START ENGINE #2. #2 ENGINE FAILED TO START RIGHT IGNITION WAS SELECTED. GROUNDED - YES. REPLACED BOTH RIGHT AND LEFT IGNITERS. REF B737-9 AMM 74-21-02.

ASAA2023050843170

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AUX PITOT LIGHT ON OVERHEAD PANEL ILLUMINATED ON APPROACH. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM 30-31-00-810-804 AUX PITOT LIGHT EXTINGUISHED. OPERATION AUX PITOT NORMAL.

ASAA2023050843189

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SATCOM LOCKUP GROUNDED - YES. SATCOM LOCKUP PROCEDURE ACCOMPLISHED IN CONJUNCTION WITH CPDLC BLOCKED LIST PROCEDURE.

ASAA2023050743196

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WHILE PERFORMING ASA T/C 31-005-00, FOUND SCHEDULED MAINTENANCE TASK "ENG 2 EEC C1" WITH FAULT CODE 732 451 52. MAINTENANCE MESSAGE 73-44144: THRUST RESOLVER ANGLE (TRA) SENSOR IS OUT OF RANGE DETECTED BY: ENGINE -2 EEC CHANNEL-B. GROUNDED - YES. ACCOMPLISHED IFIM TASK G73-22-00-810-808, ENG 2 EEC C1 MSG NOT PRESENT. SINGLE OCCURRENCE OF MSG 73-44144 FOUND ON FLT LEG 41 WITH NO REOCCURANCE SINCE. REVIEW EPCS TRA FOR ALL THROTTLES, TRA MATCHED IDLE TO FULL FORWARD AND LINEAR WHEN MOVING SLOW. NO HISTORY PAST 90 DAYS.

ASAA2023050743172

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IN CRUISE @ FL300 WINDOW OVERHEAT (R1) ILLUMINATED. FOLLOWED QRH, LIGHT ILLUMINATED AGAIN. GROUNDED - YES. REF B737-9 AMM 30-41-11 REMOVED AND REPLACED WHCU, OPS TEST GOOD.

ASAA2023050643149

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AFTER LANDING, UPON EXITING RWY, "MAINT" LIGHT ILLUMINATED. GROUNDED - YES. INTERROGATED FAULTS, FOUND THE BLEED FAMV R AND MAINTENANCE MESSAGE 36-12-021 PER B737-9 AMM 36-12-00-810-802. COMPLIED WITH PNEUMATIC ENGINE ON TEST PER B737-9 AMM 36-00-00-730-801. MAINTENANCE FAULTS CLEARED, MAINT LIGHT EXTINGUISHED.

ASAA2023050643151

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'MAINT' LT ON. STATUS SHOWS- 'BLEED FAMV R'. GROUNDED - YES. 'BLEED FAMV R' MAINT. MSG 36-12021, PERFORMED B737-9 IFIM TASK 36-12-00-810-802 PNEUMATIC ENGINE ON- TEST PASSED NO STATUS / MAINT FAULTS.

ASAA2023050643220

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DURING ACCOMPLISHMENT OF T/C 31-005-00 #2 ENG HAS FAULT MSG 36-12031 BLEED FAMV RVDT R. GROUNDED - YES. PERFORMED B737-9 IFIM TASK 36-12-00-810-804. WIRING CHECKS COMPLETED AND TESTED GOOD REF B737-9 WDM 36-11-23-1. REMOVED AND REPLACED R/H ENG FAMV REF B737-9 AMM 36-12-03. OPS CHECK NORMAL TESTS PASSED. NO FAULTS.

ASAA2023050643147

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MAP AND VTK FLAGS ON FO MFD. GROUNDED - YES. OMF SHOWS MSG 31-00242, MSG 21-65151 & MSG 21-65152, PERFORMED SUCCESSFUL B737-9 IFM 31-65-00-810-860 & IFIM 21-61-00-810-821 & IFIM 21-61-00-810-841, ALL TESTS PASSED.

ASAA2023050543154

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CAPT FMC BLANK. GROUNDED - YES. RESET CAPT FMC PER B737-9 AMM 34-61-00FMC OPS CK OK.

ASAA2023050443158

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DURING PRE-FLIGHT, THE AMBER MAINT LIGHT ON THE OVERHEAD PANEL WAS ILLUMINATED. GROUNDED - YES. STATUS SHOWS APU OIL FAULT, ACCOMPLISHED EXISTING FAULT CHECK REF B737-9 AMM 46-13-02, FAULT 49-89002 LOGGED ACTIVE. CHECKED APU OIL LEVEL AT THE TANK, APU OIL IS FULL. WAS ABLE TO CLEAR MAINT LIGHT FAULT 49-89002 IS STILL ACTIVE BUT MX LT EXTINGUISHED. T/S PER B737-9 IFIM TASK 49-00-00-810-817. RMVD & RPLCD APU ECU REF B737-9 AMM 49-61-12. APU OPS CHECK GOOD.

ASAA2023050443156

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APU FAULT ON TAXI IN. APU WOULD NOT START. GROUNDED - YES. FOUND FAULT 49130100 WITH ASSOCIATED MAINT MSG 49-41012 AND WAS NOT ACTIVE. STARTED B737-9 IFIM 49-40-00-810-805 INITIAL EVAL AND NO ACTIVE FAULT. HOWEVER WHEN STARTING THE APU FAULT LT APPEARED WITH FAULT 49-41254 (SCU SHOWS START SYS INOP) AND IT STAYED ACTIVE, RELEASED PER MEL 49-11-01. REF IFIM 49-40-00-810-821 NO ACTIVE FAULTS DETECTED AT THIS TIME, APU WORKING AS INTENDED. CLEARS MEL.

ASAA2023050443153

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AFTER X-BLEED START ON ENG #2 AND ENG #2 STARTER CUTOUT LIGHT EXTINGUISHED, THE L BLEED LIGHT AND L ENG ANTI ICE LIGHT CAME ON. DID QRH FOR BLEED LIGHT AND PRESSED TRIP RESET L BLEED LIGHT WENT OUT AND L ENG ANTI ICE LIGHT STAYED ON. GROUNDED - YES. CHECKED AND FOUND MANTENANCE MESSAGE 36-11020 ENGINE 1 HPSOV IS NOT IN COMMANDED POSITION. ACCOMPLISHED B737-9 AMM TASK 36-11-07-000-801. INSTALLED NEW HPSOV ON LEFT ENG PER AMM 36-11-07-400-801

ASAA2023050443141

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ENROUTE AT 350, BOTH FMC'S FAILED FOR APPROXIMATELY 2 MINUTES. VTK ON BOTH ND'S LNAV/ VNAV DISENGAGE. BOTH FMC'S RECOVERED AND WORKED NORMALLY FOR REMAINDER OF FLIGHT. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM 34-64-00. RESET BOTH FMC COMPUTERS. BOTH FMC COMPUTERS OPS CHECK NORMAL.

ASAA2023050343123

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"SPEED TRIM FAIL" LIGHT COMES ON DURING MASTER CAUTION RECALL ON DESCENT. GROUNDED - YES. "ONLY" CHAN A FAULT MSG 22-11186 IN FLI HISTORY ON DFCS. ACCOMP B737-9 IFIM TASK 22-11-00-810-C61 FOR TRIM CMD RESPONSE MONITOR NUISANCE FAULT- TESTS PASS OPS CK OK. NO CURRENT FAULTS.

CALA2023050301333

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COFFEE MAKER 106 REPLACE DO TO SUSPECT COFFEE HOT SMELL PULLED COFFEE MAKERS TO INSPECT BEHIND FOR FAULTY WIRING. CHECKED OK. COFFEE MAKERS 105 AND 106 REPLACED. REMOVED AND REPLACED COFFEE MAKER, OPS CHECK GOOD IAW 25-00-00 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1680817. COOKED COFFEE. CLEANED REMAINING FLUID.

ASAA2023050343097

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#2 WINDOW OVERHEAT ILLUMINATED UPON ARRIVING AT THE GATE. GROUNDED - YES. PER QRH, SWITCH WAS TURNED OFF FOR 5 MINUTES AND THE TURNED ON. LIGHT REMAINED EXTINGUISHED. A/C OK FOR SERVICE.

ASAA2023050343162

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APU FAULT LIGHT ILLUMINATED WHEN ATTEMPTING TO START THE APU AFTER LANDING. GROUNDED - YES. FOUND MAINT MSG 49-41254 START CONVERTER UNIT SHOWS START SYS INOP. PERFORMED B737-9 IFIM TASK 49-40-00-810-818, PERFORMED 5 SUCCESSFUL STARTS OF APU AND MESSAGE DID NOT REAPPEAR.

ASAA2023050343099

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OVERHEAD AND MAINT LIGHT ILLUMINATED FOR A SHORT WHILE AFTER LANDING AND THEN WENT OUT. GROUNDED - YES. A/C LOGGED FAULT 32-62101 LEFT TRA SWITCH OPEN DURING LANDING. PERFORMED B737-9 IFIM 32-09-00-810-839, FAULT IS NOT ACTIVE. MAINT LT EXTINGUISHED.

ASAA2023050343095

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FOUND #1 IDG DPI POPPED DURING WALK AROUND. GROUNDED - YES. INSPECTED AND REPLACED IDG SCAVENGE AND CHARGE FILTERS, NO DEBRIS FOUND. REF B737-9 AMM 24-11-41, LEAK CHECK GOOD, OPS CHECK GOOD.

ASAA2023050243102

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MAINT LIGHT ON GROUNDED - YES. REMOVED AND REPLACED RH ENGINE OIL SEPARATOR IAW ASA TASK CARD SBLEP-1B-79-00121 .

ASAA2023050243096

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ON LANDING AUX PITOT LIGHT CAME ON. GROUNDED - YES. PERFORMED RESET PROCEDURE PER B737-9 IFIM TASK 30-31-00-810-804 OPS CHECKS NORMAL.

ASAA2023050243098

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ON DEPARTURE CAPTAINS #2 OVERHEAT WINDOW LIGHT CAME ON. GROUNDED - YES. PERFORMED B737-9 IFIM TASK 30-41-00-810-830. CAPTAIN'S SIDE WINDOW OPS CK NORMAL. REF B737-9 AMM TASK 30-41-00-710-801.WAS AN INTERMITTENT FAULT. OK FOR SERVICE.NO HISTORY 30 DAYS.

ASAA2023050243086

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DURING CRUISE WITH WEATHER RADAR ON WITH RECEIVED PWS FAIL AND WX FAIL TURNED OFF THEN ON OPS NORMAL. GROUNDED - YES. PERFORMED B737-9 FIM TASK 34-41-00-810-818 AND WEATHER RADAR OPERATIONAL TEST PER B737-9 AMM 34-41-00-710-801. OPS CHECK NORMAL AT THIS TIME.

ASAA2023050243087

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FMC DISAGREE ON POWER UP. GROUNDED - YES. PERFORMED B737-9 IFIM 34-61-00-810-918, FMC DISAGREE MSG DID NOT RETURN, NO FAULTS NOTED AT THIS TIME.

ASAA2023050143084

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ON TAKE OFF AT APPROXIMATELY 70 KNOTS, WITH ANT-I ICE ON,THE #1 ENGINE COWL ANTI-ICE CAUTION LIGHT ILLUMINATED. TAKE OFF WAS CONY. AND QRH WAS RUN, THE LIGHT EXTINGUISHED ON CLIMB OUT AT ABOUT 4000& 5000 FT. GROUNDED - YES. REPLACED ENGINE COWL ANTI ICE VALVE PER B737-9 AMM 30-21-11-400-801.

ASAA2023050143125

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OCEANIC CPDLC SLOWLY DEGRADED BECOMING SATCOM FULLY DYSFUNCTIONAL. GROUNDED - YES. PERFORMED GOOD OPERATIONAL TEST OF SATELLITE COMMUNICATION (SATCOM) SYSTEM SAT-1 AND SAT-2 REF B737-9 AMM 23-15-00-710-801. PERFORMED GOOD CPDLC FUNCTIONAL TEST REF AMM 34-61-00-720-899. T

ASAA2023050143088

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DURING APU INSPECTION, FOUND OIL FILTER RED INDICATOR FOR LUBE FILTER ELEMENT EXTENDED. GROUNDED - YES. REMOVED AND REPLACED LUBE FILTER ELEMENT PER B737-9 AMM 49-91-13-400-801.

ASAA2023042943044

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ON RECALL GOT SPEED TRIM FAIL LIGHT CLEARED WITH MASTER CAUTION RESET. GROUNDED - YES. TROUBLESHOT PER B737-9 IFIM 22-11-00-810-071 CHANNEL A VNAV SPD/STAB TRIM TEST PASSED SPD TRIM LIGHT EXTINGUISHED.

ASAA2023042943053

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RADAR IN AUTO MODE CAPTAIN SIDE SHOWS RETURN AT 60 MILES IN CLEAR CONDITIONS FO SIDE SHOWS NO RETURN. IN MANUAL MODE RADAR WORKS NORMAL. GROUNDED - YES. CHECKED WIRING AND FOUND OPEN WIRE BETWEEN CONNECTOR D13757D PIN B11 ON DPC-1 AND CONNECTOR D40149J ON E3-1. CONTINUED TROUBLESHOOTING & FOUND DISCONNECTED TERMINAL OF WIRE W0311-2145B-24 AT TERMINAL BLOCK TB3101 POSITION B57.WIRE TERMINAL LOCKED AND SECURED AT TB3101 POS B57 REF B737-9 WDM 34-41-11.OPERATION TEST AND WXR SYSTEM TEST DONE AND FOUND GOOD REF B737-9 AMM34-41-00/201.

CALA2023042801286

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BIRD STRIKE AFTER TAKEOFF BELOW F/O''S WINDOW AND TOP END OF RADOME. PERFORMED BIRD/HAIL STRIKE CONDITIONAL INSPECTION IAW AMM TASK 05-51-18-210-801, CLEANED AREA IAW AMM 12-40-04-100-801, NO DAMAGE FOUND ON RADOME AND F/O''S R1 WINDOW.

ASAA2023042843058

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MAINT OVERHEAD LGT CAME ON JUST AFTER LANDING. GROUNDED - YES. REMOVED AND REPLACED #2 ENG ODMS SENSOR, REF B737-9 AMM 79-21-12. RESET #2 ENG ODMS CHIP COUNT, TEST 26 REF AMM 71-00-00. DMS CHIP COUNT DISPLAYS 0.0 ON EPCS PAGE. EEC TEST GOOD.

ASAA2023042843057

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#1 ENGINE WOULD NOT LIGHT OFF AFTER START LEVER RAISED TO IDLE. GROUNDED - YES. REMOVED AND REPLACED RIGHT IGNITION EXCITER PER B737-9 AMM 74-11-01.

ASAA2023042743046

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HF2 WILL NOT TRANSMIT VOICE OR RECEIVE SELCAL NO SIDE TONE OR TUNING. STATIC ONLY NO RECEPTION. GROUNDED - YES. REMOVED HF #1 AND HF #2 COUPLERS REF AMM 23-11-61-000-801. REF ASA L/P 60445245 FOR HOLD DOWN THREAD DAMAGE. REPLACED HF #1 COUPLER REF MM 23-11-61/401. REPLACED HF #2 COUPLER REF MM 23-11-61/401.

ASAA2023042743055

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NO IGNITION ON #1 ENG. "ENG VALVE CLOSED" LIGHT EXTINGUISHED AND THEN ILLUMINATED AFTER THE START LEVER WAS RAISED TO IDLE. ABORTED START PER QRH. GROUNDED - YES. REMOVED AND REPLACED #1 ENG STARTER AIR VALVE. NO LEAKS NOTED OPS CHECK GOOD. REF B737-9 AMM 80-11-02.

ASAA2023042743043

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"MAINT" CAUTION LIGHT ILLUMINATED AFTER LANDING. GROUNDED - YES. FAULT CODES 21-65151 DISPLAYED. ACCOMPLISHED B737-9 IFIM TASK 21-61-00-810-841. SYSTEM TEST AIR COND BITE TEST PASSED INTERMITTENT FAULT OK FOR SERVICE MAINT LIGHT EXTINGUISHED. TEST PASSED INTERMITTENT FAULT OK FOR SERVICE MAINT LIGHT EXTINGUISHED.

ASAA2023042543164

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UPON LANDING, MAINT CAUTION LIGHT ILLUMINATED ON OVERHEAD PANEL NO OTHER CAUTION LIGHTS APPEARED TO ILLUMINATE. GROUNDED - YES. REMOVED #2 ENG ODMS SENSOR, ACCOMPLISHED ASA T/C 79-ASA-02 STEPS 1-2.B(5) FOUND PARTICLES AND SENT OUT FOR ANALYSIS, REMOVED ALL 4 SCAVENGE SCREEN PLUGS, INSPECTED SCAVENGE SCREENS REF B737-9 AMM 79-21-04, NO DEFECTS NOTED, INSTALLED ALL 4 SCAVENGE SCREENS REF AMM 79-21-04, INSPECTED ENG #2 STARTER MAGNETIC PLUG REF AMM 80-11-09 FOUND ABNORMAL PARTICLES. REMOVED AND REPLACED #2 ENGINE STARTER PER AMM 80-11-01-000-801-600 (REF LOG PAGE 60555135) PER TECH SERVICES LAB REPORT #23.050401 REPORTS THE MATERIAL TO BE SILVER [LATER IRON; BASED ON LAB ANALYSIS AND PHYSICAL CHARACTERISTICS RECOMMEND DISPOSITION IAW AMM 79-00-00-220-801-G00, FIGURE 606, 3RD LINE ITEM DOWN "SERVICEABLE RESET ODMS. ACCOMPLISHED AMM 79-00-00-220-801-G00 THROUGH PG 5 (C) 1). ACCOMPLISHED HIGH POWER RUN REF AMM 79-00-00-220-801-G00 PG .5 (C) 2)- REMOVED ODMS SENSOR -NO PARTICLES- REINSTALLED ODMS SENSOR REF AMM 79-00-00-210-804-G00 NEED TO LEAK CHECK AND SET CHIP COUNT TO ZERO REF PAGE 2(A). CHIP COUNT RESET PER 71-00-00-700-802-G00 C/W #2 ENGINE SCAVENGE SCREEN PLUG INSPECTION REF. AMM 79-21-04-211-801-G00 AFTER HIGH POWER RUN NO DEBRIS FOUND. ACCOMPLISHED LEAK CHECK OF #2 ENGINE SCAVENGE SCREEN PLUGS AND ODMS SENSOR, LEAK CHECKS GOOD. REMOVED #2 ENGINE OIL FILTER CARTRIDGE ELEMENT REF. AMM 79-21-07. NO DEBRIS FOUND. INSTALLED NEW #2 ENGINE OIL FILTER CARTRIDGE REF AMM 79-21-01. LE

ASAA2023042542999

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CAPT FMC FAILED FOR ABOUT 20 SECONDS AND CAME BACK IN CRUISE. CAPT ND VTK. NO FMC ON MCDU'S. FMC P/RST LIGHT. ALL NORMAL BEFORE QRH COULD BE PERFORMED. GROUNDED - YES. LAST LEG L/H FMC FAULTED "INTERMITTENT FMC PRES POS LAT". PERFORMED B737-9 FIM 34-61-00-810-918. OPS NML. ETOPS GND VERIFICATION TEST SUCCESSFUL.

ASAA2023042442970

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TECH SERVICES REQUEST FOLLOW-UP TO LEFT BLEED LOW TEMP AERMETRIC FAULT GROUNDED - YES. REPLACED THE #1 ENG FAMV PER B737-9 AMM 36-12-03. OPS CKS GOOD, ETOPS GROUND VERIFICATION SUCCESSFUL.

ASAA2023042443006

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ON LANDING MASTER CAUTION CAME ON WITH MAINT LIGHT ON OVERHEAD. GROUNDED - YES. FOUND FAULT CODES FOR ENGINE #2 ODMS. RELEASED PER MEL 79-21-01A #2 ENGINE ODMS INOP. COMPLETED B737-9 IFIM TASK G79-21-00-810-811 STEP A THRU B.(8). AIR/OIL SEPARATOR REPLACED WITH POST LEAP-1B-SB-79-0012 PER T/C SBLEAP-1B-79-0012-1. OPS/LEAK CHECK OK, GROUND VERIFICATION SUCCESSFUL.

ASAA2023042442989

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WHILE PERFORMING #2 ENG IDLE RUN, LOUD WHINING NOISE WAS HEARD FROM STARTER. AFTER STARTER CUTOUT SOUND WENT AWAY. GROUNDED - YES. PERFORMED VISUAL INSPECTION OF STARTER & FOUND STARTER FAN BLADE DAMAGED. REMOVED & REPLACED #2 ENG STARTER REF B737-9 AMM 80-11-01. LEAK & OPS CHECKED GOOD.

ASAA2023042342982

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WING ANTI ICE L+ R ORANGE LIGHT WHEN WING ANTI ICE SELECTED ON, R ANTI ICE LIGHT WENT OUT AFTER APPROX 1 MIN. L WING ANTI ICE LIGHT STAYED ON FOR APPROX 4 MINS. EVENTUALLY CLEARED. GROUNDED - YES. PERFORMED LEFT WING THERMAL ANTI ICE VALVE HEALTH CHECK REF B737-9 AMM 30-11-11. OPS CHECK GOOD NO DEFECTS NOTED AT THIS TIME ON LH ANTI ICE VALVE. PERFORMED WING THERMAL ANTI ICE VALVE OPS TEST WITH APU BLEED PNEUMATIC AIR REF AMM 30-11-11. OPS CHECK GOOD NO DEFECTS NOTED AT THIS TIME ON RH ANTI ICE VALVE.

ASAA2023042342983

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R VALVE LIGHT ILLUMINATED WHEN WING ANTI-ICE WAS SELECTED. GROUNDED - YES. ACCOMPLISHED WING THERMAL ANTI ICE VALVE OPS TEST USING APU AIR. R VALVE OPS TEST PASS REF B737-9 AMM 30-11-11-710-801.

ASAA2023042342975

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GE DIAGNOSTICS REPORTS #1 ENGINE (SN 602946) TREND DATA SHOWS EXCESS COKING OF THE FUEL NOZZLE MAIN ORIFICES. GROUNDED - YES. ACCOMPLISHED FUEL NOZZLE REPLACEMENT PER ASA T/C 73-ASA-02.

ASAA2023042242976

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CREW ADVISED #2 ENG HUNG START 1ST ATTEMPT WITH SUCCESSFUL 2ND ATTEMPT OUT OF RALEIGH. GROUNDED - YES. CHECKED OMS AND FOUND FAULT CODE 74-42544 RIGHT IGNITION SYSTEM IS FAILED. MSG NOT ACTIVE. REMOVED AND REPLACED RIGHT AND LEFT IGNITER PLUG ON THE #2 ENGINE REF B737-9 AMM 74-21-02. OPS TESTS GOOD.

ASAA2023041942929

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WING ANTI ICE "L VALVE" LIGHT ILLUMINATED WHEN THE WING ANTI ICE WAS TURNED ON. LIGHT TURNNED OFF WHEN WING ANTI ICE WAS TURNED OFF. GROUNDED - YES. PERFORMED LEFT WING THERMAL ANIT ICE VALVE HEALTH CHECK REF B737-9 AMM 30-11-11. OPS CHECK GOOD, AND INLET TUBE CLEAR. NO HISTORY 30 DAYS. A/C OK FOR SERVICE.

ASAA2023041942932

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ON TAXI IN THE OVERHEAD PANEL "MAINT" ANNUCIATOR ILLUMINATED. GROUNDED - YES. #2 ENGINE FAMV MGS 36-12021, ACCOMPLISHED B737-9 IFIM TASK 36-12-00-810-802 MSG CLEARED AFTER PNEUMATIC SYSTEM TEST, NO HISTORY PAST 90 DAYS.

ASAA2023041942950

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AFTER LANDING, OVERHEAD MAINT LIGHT ILLUMINATED. GROUNDED - YES. STATUS PAGE SHOWS FAMV R. RUN IAM B737-9 FIM TASK 36-12-00-801-802. NO RELATED FAULT, RUN B737-9 AMM TEST FAMV R TEST OK, REF 36-12-00.

ASAA2023041942925

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MAINT LIGHT ON OVERHEAD PANEL ILLUMINATED AFTER LANDING. GROUNDED - YES. MDS STATUS INDICATES "PACK RAM AIR SYSTEM L" W/ A CORRELATED ACTIVE MESSAGE 21-55010. PRECAUTIONARY INSPECTED LEFT AFT RAM AIR EXHAUST ACTUATOR LINKAGE AND CONNECTIONS FINDING ALL SECURE. NO HISTORY PAST 30 DAYS. NO HISTORY SET BY NFS. ETOPS GROUND VERIFICATION SUCCESSFULLY.

ASAA2023041942949

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AFTER LANDING, AMBER MAINT LIGHT ON OVERHEAD PANEL ILLUMINATED. GROUNDED - YES. REPLACED #2 FAN AIR MODULATING VALVE REF B737-9 AMM 36-12-03.

ASAA2023041942931

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OVERHEAD MAINT LIGHT ILLUMINATED. GROUNDED - YES. FOUND MX MSG 36-11011 ON #2 ENG HPSOV TORQUE MOTOR SIGNAL IS OUT OF RANGE, PERFORMED SYSTEM TEST ON IASC RIGHT OPS CHECK GOOD, PERFORMED BLEED HPSOV CTRL R OPS CHECK GOOD, LRU REPLACEMENT PASS, REF B737-9 IFIM TASK 36-11-00-80-809.

ASAA2023041942946

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F/A REPORTS DIRTY SOCK SMELL COMING FROM AFT GALLEY NEAR THE R2 DOOR. ODOR BEGAN AND WAS FIRST NOTICED DURING THE TAKE OFF ROLL. ODOR WAS CONFIRMED BY COMMUTING ALASKA PILOT AS DIRTY SOCK SMELL AND NOT OF ELECTICAL, OIL, FLUID ORIGIN.ODOR PERSISTED AT CRUISE.DEEMED AIR QUALITY EVENT LEVEL 3 W/3 FAS REPORTING HEADACHES & CONFUSION. GROUNDED - YES. REF S,OKE OR FUMES IN CABIN ( CONDITIONAL INSPECTION) B737-9 AMM 05-51-56-200-801, STARTED B737-9 IFIM 21-00-00-810-830, COMP STEP A,1 THROUGH A8, APU DRAIN LINES WAS OIL FREE AND HYD. PROPERLY SERVICED. NO DEFECTS FOUND. COMPLETED IFIFM 21-00-00-810-830, NO DIRTY SOCK SMELL DETECTED WITH AIR SUPPLIED FROM APU AND BOTH ENIGINES. NO HISTORY OF CABIN ODOR IN LAST 90 DAYS.

ASAA2023041842930

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TEMP PROB LIGHT ILLUMINATED DURING FLT. GROUNDED - YES. REMOVED AND REPLACED TAT PROBE PER B737-9 AMM 34-21-06/401.

ASAA2023041842921

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LEVEL IN CRUISE FLIGHT LEFT FMC FAILED WITH AN AUTO RECOVERY 10 SECONDS LATER. GROUNDED - YES. ACCOMPLISHED FMC OPS CKS REF B737-9 AMM 34-61-00 OPS NML, NO HISTORY PAST 30 DAYS.

ASAA2023041842922

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UPON PERFORMING ASA T/C 72-ASA-03. FOUND DEFECTIVE HELICOIL ON LOCK-OUT OF #2 ENG HPSOV. GROUNDED - YES. PERFORMED ALT-LOCKOUT PROCEDURE IAW B737-9 CHPT 5, 05-07-01 TABLE 3 ITEM #7. REMOVED HPSOV IAW B737-9 AMM 36-11-07-000-801.INSTALLED HPSOV ON #2 ENG AND ACCOMPLISHED OPERATIONAL CHECK IN REF TO AMM 36-11-07-400-801 OPS CHECKS GOOD NO LEAKS NOTED, NO DEFECT NOTED.

ASAA2023041842927

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HF # 2 RTP INDICATES FAIL. GROUNDED - YES. INTIAL TROUBLESHOOTING REVEALED MAINTENANCE MESSAGE 23-21042 UNDER PRESENT LEG FAULTS. FOUND 5 INTERMITTENT FAULTS, AND 2 HARD FAULTS. BITE TEST ON LRU HF # 2 SHOWED GREEN. PRECAUTIONARY REMOVED AND REPLACED HF # 2 TRANSCEIVER REF B737-9 AMM 23-11-21/401. GROUND VERIFICATION SUCCESSFUL.