JASC 4950

Service difficulty reports · 949

Reports filed under 4950 · APU Bleed Air System, newest first.

Query with SQL
duckdb -csv -c "SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
  FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
  WHERE jasc_code = '4950'
  ORDER BY difficulty_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SDR I5PA2026090968804Valve · intermittentETOPS SIGNIFICANT REPORT. APU PNEUMATIC SHUTDOWN VALVE INTERMITTENT. REPLACED APU PNEUMATIC SHUTOFF VALVE PER APPLICABLE AMMSep 9, 2026 · N688SL · Boeing 757230SDR I5PA2026090768803Switch · inoperativeETOPS SIGNIFICANT REPORT. APU PNEUMATICS INOP. REPLACED APU GEN DPI SWITCH PER APPLICABLE AMM.Sep 7, 2026 · N688SL · Boeing 757230SDR I5PA2026090288801Apu · inoperativeETOPS SIGNIFICANT REPORT, APU PNEUMATICS INOPERATIVE. REPLACED APU PER APPLICABLE AMMSep 2, 2026 · N888LT · Boeing 757230SDR YENA2026090400725Transducer · failedFLT 1621, LHR-BOS. (ETOPS) APU BLEED FAULT ( APU BLEED AIR SUPPLY SYSTEM ). R & R APU DIFF PRESSURE TRANSDUCER IAW AMM 49-51-16. OPS TEST SATISFACTORY. GROUND VERIFICATION OF APU BLEED IAW AMM 49-00-00 SATISFACTORY. THIS CLEARS MDDR 629063.Sep 1, 2026 · N4062J · Airbus A321271NXSDR CALA2026083119034O-Ring · damagedAPU AUTO SHUTDOWN CABIN ODOR ASSOCIATED NOTED IN CABIN APU BITE SHOWED ADD OIL. SVCD APU OIL. PERFORMED GVI AND FOUND APU BLEED DUCT MISSING HARDWARE. REPORTED APU BLEED AIR DUCT MISSING HARDWARE, WILL NEED TO BE REPLACED MISSING O-RING SEAL AT APU BLEED DISCAug 31, 2026 · N73406 · Boeing 737924SDR SWAA2026082492036Bleed Valve · odorWITH APU BLEED ON, FOUL ODOR PRESENT AND ERRATIC DUCT PRESSURE WITH APU BLEED ON. R & R APU BLEED AIR VALVE IAW AMM 49-52-11 EV E060454. OPS CHKD GOOD.Aug 20, 2026 · N8773Q · Boeing 7378SDR DALA2026081904741O-Ring · leakingDURING TAXI IN SMELLED STRONG FUMES IN THE FLIGHT DECK. MAINTENANCE OBSERVED A LOT OF SMOKE FROM L ENG. NO OBSERVED ENGINE ABNORMAL READINGS, PACKS WERE GETTING AIR FROM APU WHEN ODORS BEGAN. REMOVED LPT FLANGE ASSY IAW AMM 72-56. GVI EXPOSED AREAS. INSTALLEDAug 16, 2026 · N848DN · Boeing 737932ERSDR I5PA2026081388802Actuator · faultedFLIGHT: MGE502M ETOPS: AIRCRAFT RETURNED TO GATE DUE TO ENGINE STABILIZATION ISSUE AFTER ENGINE START. FOUND APU BLEED PRESSURE LOW. FAULT ISOLATED TO APU IGV ACTUATOR. REPLACED ACTUATOR PER APPLICABLE AMMAug 13, 2026 · N888LT · Boeing 757230SDR I5PA2026081119303Sensor · faultyAPU BLEED PRESSURE LOW, REPLACED APU FLOW SENSING MODULE IAW AMMAug 11, 2026 · N193AN · Boeing 757223SDR IPXA2026081116362Bleed Air Sys · odorUPON TURNING ON APU BLEED AIR, NOTICED A STRONG FUEL ODOR COMING OUT OF THE VENTILATION AREAS IN COCKPIT AND SUPERNUMARY COMPARTMENT. T/S AND FOUND TORQUE MOTOR ON APU FUEL CONTROL LEAKING FUEL INTO THE APU INTAKE. R/R TORQUE MOTOR SEAL PER CMM 49-31-61. OPS AAug 11, 2026 · N126UP · Airbus A300F4622RSDR HNAA2026080400646Bleed Air Sys · leakingCREW NOTIFIED CLT MX OF EXHAUST FUMES IN COCKPIT. CLT MX CREW REPORTED SMELL IN COCKPIT, CABIN NORMAL, FUTHER TROUBLESHOOTING FOUND APU BLEED CAUSE OF FUMES AND WAS PUT ON MEL. A/C DEPARTED WITH NO FURTHER ISSUES IN FLIGHT.Aug 4, 2026 · N655AE · Emb EMB145LRSDR I5PA2026072488803Module · faultyAPU INOP. R & R FLOW SENSING MODULE PER AMM, OPS CHECK NORMAL.Jul 24, 2026 · N888LT · Boeing 757230SDR DALA2026061603604Bleed Valve · crackedFA.S NOTED BURNING ODOR MID CABIN. FLOOR IS HOT TO THE TOUCH. VERIFIED CRACK ON VALVE NO OTHER DEFECTS AROUND SURROUNDING AREA. BEGUN REMOVING APU BLEED VALVE PER B737 AMM 36-13. INSTALLED APU PNEUMATIC DUCT AND TIGHTENING V-CLAMPS PER B737 AMM 36-13. PERFORMEJun 14, 2026 · N3757D · Boeing 737832SDR IPXA2026042634350Clamp · crackedCRACKED CLAMP - APU ACOC COOLING DUCT. I.A.W.AMM 49-51-04-004-001 REV116 AND AMM 49-51-04-404-011 REV116 REPLACED THE CLAMP WITH NEW.Apr 4, 2026 · N575UP · Boeing 74744AFSDR CALA2026021013665Bleed Valve · faultedDUAL BLEED INDICATION, DURING TROUBLESHOOTING IAW TSM 49-55 TASK 803 UP TO AND INCLUDING STEP E. NO FAULTS IN APU BITE. APU BLEED LIGHT HIT MULTIPLE TIMES. LOGPAGE FOUND 7718787 FOUND APU BLEED VALVE REMAINED OPEN WITH SWITCH OFF. PER FIM 49-55 TASK 803, R &Feb 6, 2026 · N69847 · Boeing 737924ERSDR ABXA20260130038Pneumatic System · failedDURING TAXI OUT, APU PNEUMATICS INOP. A/C RETURNED TO BLOCKS (BTB). MAINTENANCE DEFERRED PER MEL 49-11-1-1. PLACARD INSTALLED, CAT C DUE DATE 2/9/26. MAINT. PROCEDURES 36-11-4 C/W. AIRCRAFT RETURNED TO SERVICE.Jan 30, 2026 · N650GT · Boeing 767231SDR DALA2026012900704Apu · odorDIRTY SOCK SMELL WHEN APU BLEED SELECTED ON. SEE MD-ODI LOG 1420595 FOR WORK PERFORMED AND CORRECTIVE ACTION. (LP: 8035639)Jan 27, 2026 · N329NB · Airbus A319114SDR DALA2025102307761Bleed Air Sys · contaminated(LOG 8004328) ODOR ON T/O DISSIPATED WHILE CLIMBING ODOR RETURNED WHILE ON APPROACH THROUGH FL180. ISOLATED ODOR FROM APU BLEED AIR. PERFORMED OIL DECONTAMINATION. COMPLETED BLACK LIGHT USE AT APU DUCT, LIGHT OIL RESIDUE NOTED. DUCT REASSEMBLED. BLACK LIGHT USOct 19, 2025 · N818DA · Boeing 737932ERSDR I5PA2025092568805Module · faultedAPU PNEUMATICS INOP. R & R APU FLOW SENSING MODULE PER AMM. OPS CHECK NORMAL.Sep 25, 2025 · N688SL · Boeing 757230SDR DALA2025082206260Bleed Valve · faultedATO DUE TO ENG THRUST LOSS BLEED CONFIG ECAM MSG WHEN T/O POWER WAS SELECTED. R & R APU BLEED VALVE. OPS CHECK GOOD. (7355668)Aug 21, 2025 · N860NW · Airbus A330223SDR YENA2025081200825Sensing Element · faultedFLT#348, LAS-JFK. (ETOPS) "AIR APU BLEED LEAK ECAM FOLLOWED BY ENG 1 BLEED AND PACK 1 FAULT ( APU BLEED AIR SUPPLY SYSTEM ); REF LOG PAGE 4292814 ITEM 2 (REPLACED APU OVERHEAT SENSING ELEMENTS 18HF AND Q9HF IAW AMM 36-22-17. OPS CHK GOOD) REPLACED SENSING ELEMAug 11, 2025 · N2169J · Airbus A321271NXSDR AALA202508056197Inlet Door · openAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: DURING CLIMBOUT THERE WERE CONTINUOUS AIRFRAME VIBRATIONS AS AIRCRAFT ACCELERATED TO CLIMB SPEED. AIRCRAFT EMERGENCY LANDED SAFELY AT PHL. UPON LANDING APU INLET DOOR WAS FULLY OPEN WHILE OM MEL 49-51. AAug 3, 2025 · N329SL · Boeing 7378SDR DALA2025072905697Duct · damagedAPU HIGH PRESSURE BLEED DUCT HAS PLY SEPARATION AT FIRE LOOP STANDOFF, 10 INCHES FWD OF FRAME 85. PER AMDS, REQUIRES CUSTOMER RESPONSE CENTER NOTIFICATION. SCEPTRE LOG PAGE ENTERED FOR SDR REPORTING. SUMMARY SEE NR FOR ADDITIONAL INFORMATION 066-0001:3610-2002Jul 24, 2025 · N127DU · Airbus BD5001A10SDR DXTA2025062003932Shutoff Valve · faultedWHEN STARTING ENGINES WITH APU RUNNING, APU BLEED AIR OFF, HEAVY SMELL OF JET EXHAUST IN CABIN AND COCKPIT. CREW NOTICED THAT WHEN THE APU BLEED AIR KNOB WAS SELECTED OFF, THE WHITE APU BLD VALUE CLOSED CAS MESSAGE NEVER APPEARED. REPLACED APU BLEED AIR SHUTJun 17, 2025 · N503QS · Cessna 680ASDR NACA2025072800002Warning Message · false activationAPU DUCT PRESSURE LOW AT ENG STARTUP. PERFORMED APU DUCT BLEED AIR OPS CHECK IAW B767 AMM 36-00-00-862-025 OPS CHECK GOOD NO LEAKS FOUND.Jun 11, 2025 · N565NC · Boeing 7673BGSDR CALA2025060505286Surge Valve · faultedF/AS REPORTED A THUMPING SOUND AND VIBRATION UNDE R THE AFT GALL EY JUMPSEA T. STARTED B4 GEAR DODEBRIEFED CREW SUSPECT APU BLEED VALVE. WITH APU RUNNING AND APU BLEED ON, PACKS RUNNING. WHEN EITHER PACK IS TURNED OFF, THE APU BLEED DUCT IN A/C AND WHEEL SHUTTJun 2, 2025 · N17139 · Boeing 757224SDR YENA2025060200557Bleed Air Sys · faultedFLT#2348, LAS-JFK. (AIRCRAFT PERFORMED AN AIR TURN BACK TO LAS) .' AIR APU BLEED FAULT; PERFORMED OPS TEST BMC#1 MIAW AMM 36-11-00 AND OPS CHK APU BLEED IAW AMM 26-12-00 NO FAULT ON THIS TIME A/C OK FOR SVC.'Jun 1, 2025 · N979JT · Airbus A321231SDR DALA2025043003336Bleed Air Sys · odor800 FT ON APPROACH FO SMELLED DIRTY SOCK ODER , 500 FT CA SMELLED IT AS WELL.APU WAS STARTED ONCE LANDED .R BLEED TURNED OFF SMELL DISAPPEARED. DUCT BURNOUT C/ W AGAIN WITH RT ENG PER AMDS CARD 0550-2008.LT ENG BLEED LOCKED BACK PER AMP 36-11 AS NOTED IN LOG #Apr 27, 2025 · N106DU · Airbus BD5001A10SDR CALA2025042304169Duct · leakingAIR/VENT/GRILLE BY FEET ROW 25/ LEFT SIDE IS HOT AND HAS A BURNI NG SMELL WITH APU BLEED AIR ON AND PACKS RUNNING ROW 25 HAS A HISSING SOUND AND FLOOR IS HOT. WITH APU BLEED AIR OFF AND LEFT ENGINE RUNNING AND PACK RUNNING NO HISSING SOUND HEARD AND ROW 25 IS Apr 21, 2025 · N18223 · Boeing 737824SDR ABXA20250421083Bleed Valve · warning messageON TAXI OUT, APU BLEED VALVE EICAS MSG ILLUMINATED. AIRCRAFT RETURNED TO BLOCKS (BTB). MAINTENANCE DEFERRED APU IAW MEL ABX-49-11-1A. PLACARD INSTALLED. MX PROCEDURES C/W. NO ETOPS. AIRCRAFT RETURNED TO SERVICE.Apr 21, 2025 · N1427A · Boeing 767306SDR AALA202504049752Bleed Valve · failedAIRCRAFT WAS GROUNDED: FLIGHT ATTENDANT REPORTS INTERMITTENT SULFUR LIKE ODOR AROUND AREA OF FORWARD SERVICE DOOR BY COAT CLOSET. ACCOMPLISHED JOB CARD 08L00021001. INSPECTED CABIN FOR SULFUR TYPE ODORS. UNABLE TO DUPLICATE. RAN PACKS SEVERAL MINUTES WHILE CYCApr 3, 2025 · N973NN · Boeing 737823SDR AALA202504012772O-Ring · cutAIRCRAFT WAS GROUNDED: ABOUT 5 MINUTES AFTER ENGINE START CABIN WAS NOT COOLING DOWN. WE SWITCHED TO MAX COOLING FROM THE APU. ABOUT 30 MINUTES LATER 3 OF 4 FLIGHT ATTENDANT AND SOME PASSENGERS COMPLAINED OF SMELLING FUMES AND ASLIGHT HEADACHE. IT WAS MOSTLY AMar 24, 2025 · N972AN · Boeing 737823SDR YENA2025032400304Apu · odorFLT#583, JFK-MCO.' ON DESCENT BELOW 10000 FEET NOTICED STRONG DIRTY SOCK SMELL ON SHORT FINAL FA'S CALLED TO COMPLAIN OF A POSSIBLE FUME EVENT IN PROGRESS. AFTER LANDING DISSIPATED; COMPLIED WITH INFO NOTICE 2017-T015K SECT B2. FOUND SOURCE OF SMELL TO COME FRMar 23, 2025 · N517JB · Airbus A320232SDR HALA20250220066Duct · damagedETOPS - FOUND APU BLEED DUCT DAMAGED BETWEEN COMPRESSOR AND SURGE VALVE. REMOVED AND REPLACED APU BLEED DUCT BETWEEN COMPRESSOR AND SURGE VALVE PER AMM 49-51-42. LEAK CHECK GOOD. OK FOR SERVICEFeb 19, 2025 · N388HA · Airbus A330243SDR I5PA2025021768804Surge Valve · faultyFLT NO: N/A (MX INSP) ESI - APU AUTO SHUTDOWN. R/R APU SURGE VALVE. OPS CHECK NORMAL.Feb 17, 2025 · N688SL · Boeing 757230SDR I5PA2025021768803Apu · faultyFLT NO: N/A (MX INSP) ESI - APU BLEED INOP. R/R APU PER AMM 49-11-01. OPS CHECK NORMAL.Feb 17, 2025 · N688SL · Boeing 757230SDR I5PA2025021068801Check Valve · wornFLT NO: N/A (MX INSP). ESI - APU CHECK VALVE WORN. R/R APU BLEED AIR CHECK VALVE PER AMM 36-11-11.Feb 10, 2025 · N688SL · Boeing 757230SDR ABXA20250206034Bleed Air Sys · faultedDURING TAXI WHILE STARTING ENGINE APU DOES NOT HAVE PNEUMATIC AIR FOR ENGINE START,A/C THEN RETURNED TO THE GATE (BTB) AND MTX GROUNDED A/C. MTX DEFERRED APU AIR FOR DEPARTURE IAW MEL ABX-49-11-1-1. AND RETURNED A/C TO SERVICE. A/C DEPARTEDFeb 6, 2025 · N762CK · Boeing 7673P6SDR I5PA2025012768802Module · faultyFLT: N/A (MX INSP) ESI - NO APU BLEED. REMOVED AND REPLACED FLOW SENSING MODULE PER AMM.Jan 27, 2025 · N688SL · Boeing 757230SDR YENA2025012200094Bleed Air Sys · odorFLT#743, JFK-AUA. 'DIRTY SOCK SMELL REPORTED BY FLIGHT ATTENDANT FROM MID TO AFT CABIN ( APU BLEED AIR SUPPLY SYSTEM ); REF LP # 4219340, ITEM 2 OR WO # 1387703 TSI . THIS CLEARS THIS MDDR. MDDR CLEARED. MX-4 UPDATED. PLACARD RMVD. MCC NOTIFIED.'Jan 20, 2025 · N613JB · Airbus A320232SDR AALA202501084835Apu · odorAIRCRAFT WAS GROUNDED: WHILE DESCENDING THE APU WAS STARTED AND A STRONG BURNING ODOR WAS DETECTED. IT SMELT VERY SIMILARTO BURNING PAPER. UPON NOTICING THE SMELL THE BLEED CONFIGURATION WAS IMMEDIATELY REVERTED TO ITS PREVIOUS SETTINGS AND THE APU WAS SHUT DOJan 7, 2025 · N887NN · Boeing 737823SDR YENA2024122701637Bleed Air Sys · odorFLT#1269, BOS-FLL. 'ON DESCEND THRU 5000 FEET WE ENCOUNTERED DIRTY SOCK SMELL; ACCOMPLISHED INFO NOTICE 2017-TO15K FOUND CAUSE OF ORDER THE APU BLEED, APU DEFERRED AT LOG PG 4211607. BOTH BURN AND CLEAN NO SMELL AT THIS TIME. A/CO OK FOR SVC. TSM 05-501-00-810Dec 24, 2024 · N949JT · Airbus A321231SDR ABXA20241211251Apu · faultedAFTER DE-ICE APU WOULD NOT PRODUCE ENOUGH AIR FOR START AC RETURNED TO GATE (BTB) AND MTX GROUNDED AC . AND DEFERRED APU IAW MEL ABX-49-11-1A AC REMAINS NO ETOPS . AC WAS RETURNED TO SERVICE .Dec 11, 2024 · N371CM · Boeing 767338SDR ABXA20241210250Apu · faultedAPU AIR PRESSURE LOW DURING START (11 PSI)DURING LH ENGINE START HUNG AT 25% N2 ON TAXI OUT. AC RETURNED TO GATE (BTB) . MTX GROUNDED AC AND DEFERRED APU IAW MEL ABX-49-11-1A ACCOMPLISHED MPM PLACARD INSTALLED AND AC REMAINS NO ETOPS MBCB 12-20-2024 AC RETURNEDec 10, 2024 · N220CY · Boeing 767383SDR CVGA20241212001Bleed Air Sys · faultedJET FUEL SMELL COMING INTO AIRCRAFT FROM THE AIR VENTS. MORE PROMINENT FROM THE OVERHEAD COLD AIR VENTS THAN THE CONDITIONED / HEAT VENTS. NO SMELL PRESENT IN LUGGAGE COMPARMENT OR TAIL CONE ACCESS AREA. NO FUEL NOTED PUDDLING UNDER AIRCRAFT. WAS TROUBLESHOT ADec 7, 2024 · N512UP · Cessna 560XLSDR YENA2024120201522Apu · smokeFLT#255, JFK-PLS. 'LEVEL 1 FUME EVENT SOCK SMELL FROM ROWS 27 AND BACK OCCURRED DURING DESCENT ( APU BLEED AIR SUPPLY SYSTEM ).' (SUPPLEMENTAL INFORMATION TO FOLLOW)Dec 1, 2024 · N949JT · Airbus A321231SDR DALA2024120311390abnormalSHIP 3102 INTERMITTANT ODOR DETECTED ON DECENT AND AGAIN ON GROUND FOUND RESIDUAL DE-ICE FLUID BY APU INTAKE. CORRECTIVE ACTION: PERFORMED DECONTAMINTAION OF BLEED DUCTS REF. A319 AMM 36-10. PER MCC, PLACING APU ON MEL 49-10-01A FOR CLEANING. R/R BOTH RECIRC FNov 30, 2024 · N302NB · Airbus A319114SDR AALA202411277891Cooling Fan · leakingAIRCRAFT WAS GROUNDED: AFTER APU BLEED AIR ON, DIRTY SOCKS SMELL IN ENTIRE AIRCRAFT DURING CRUISE. NO INJURIES REPORTED. MAINTENANCE FOUND EVIDENCE OF OIL LEAK AT APU COOLING FAN AND REPLACED APU COOLING FAN IAW AMM 49-52-51.Nov 25, 2024 · N722US · Airbus A319112SDR YENA2024112501497Bleed Air Sys · odorFLT#771, BOS-CUN. 'INBOUND FA'S ALL REPORT A FUME IN THE CABIN UPON LANDING ( APU BLEED AIR SUPPLY SYSTEM ).' (SUPPLEMENTAL INFORMATION TO FOLLOW)Nov 23, 2024 · N949JT · Airbus A321231SDR ABXA20241121230Controller · faultedDURING TAXI APU NOT PRODUCING BLEED AIR AC RETURNED TO BLOCK (BTB). MTX GROUNDED AC , RESET AND CLEANED FAULT ON APU CONTROLLER PER AMM 49-67-05 APU OPS CHECK GOOD. BLEED AIR CHECK TESTS GOOD AND RETURNED AC TO SERVICENov 21, 2024 · N783AX · Boeing 767281
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