JASC 4990

Service difficulty reports · 2,654

Reports filed under 4990 · APU Oil 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 = '4990'
  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 HALA20251002299Filter · trippedETOPS - APU OIL LUBE FILTER DIFFERENTIAL PRESS IND POP OUT, AND UNABLE TO RESET. PER AMM 49-91-41-960-801-A, REPLACED APU OIL LUBE FILTER AND INSP FILTER COND CLEAN. T/S DELTA P IND STUCK. AFTER CLEANED, RESET SUCCESSFUL. APU RUN 10 MINS NO LEAKAGE FOUND. OK TOct 1, 2025 · N381HA · Airbus A330243SDR AALA202510026255Cooling Fan · leakingAIRCRAFT WAS GROUNDED: SLIGHT DIRTY SOCK ODOR NOTICED DURING TAXI OUT. ODOR DISSIPATED ENROUTE, HOWEVER RETURNED DURING THE DESCENT. VERY STRONG ODOR IN DESCENT CAUSING IRRITATION. MAINTENANCE FOUNDAPU COOLING FAN ASSEMBLY LEAKING OILOct 1, 2025 · N587UW · Airbus A321231SDR AALA202510026568Pressure Switch · failedAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: APU FAILED IN FLIGHT, CAUSED A SINGLE SOURCE OF ELECTRICAL SOURCE. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT MEM. REMOVED AND REPLACED LOW OIL PRESSURE SWITCH, PER AMM 49-94-22. REMOVED AND REPLACED NUMSep 30, 2025 · N963NN · Boeing 737823SDR DALA2025100107135Oil System · leakingAIRCRAFT 5015, DURING DEPLANING- ACRID SMELL FROM VENTS WITH APU-BLEED ON. TURNED OFF APU BLEED AND SMELL DISSAPATED. TURNED BLEED ON AND SMELL RETURNED. CORRECTIVE ACTION: FOUND OIL LEAD LEAK ON APU FUEL CONTROL UNIT PER W/C 4900-2001 STEP 4. LEVEL B DECON. RSep 30, 2025 · N515DE · Airbus A321271NXSDR AALA202510025771Sensor · inoperativeAIRCRAFT WAS GROUNDED: DUE TO SOF EVENT REF MIC 1557921. SUSPECTS APU OF SOURCE OF ODOR. MAINTENANCE REPLACED APU OIL TEMP SENSOR PER AMM 49-94-15.Sep 28, 2025 · N837AW · Airbus A319132SDR HALA20250929291Pressure Switch · faultedETOPS - APU AUTO SHUTDOWN. REMOVED & REPLACED. ECB & OIL PRESSURE SW PER AMM 49-61-34 & AMM 49-91-14. OPS + LEAK CK GOOD. OK FOR SVCSep 27, 2025 · N213HA · Airbus A321271NSDR GTIA2025092539087Oil System · overservicedFUME EVENT DETECTED IN CABIN ON DESCENT-FOLLOWED TSM 05-50-00-810-831-1. FOUND APU OVERSERVICED TYPE 3 & DRAIN OIL AS PER AMM 49-90-00 TO PROPER LEVEL, ALSO REF. LOG ITEMS 3510219-1 & 2 FOR RECIRC FILTERS, R/R AND ENG IDLE RUN. NO DEFECTS AT THIS TIME.Sep 22, 2025 · N705NK · Airbus A321271NXSDR HALA20250923288Heater · faultedETOPS - 2HR INTO FLIGHT ELEC CB TRIPPED APU 5000VU. REMOVED AND REPLACED APU OIL HEATER PER AMM 49-96-11 LEAK CHECK GOOD OKAY TO CONTINUESep 22, 2025 · N388HA · Airbus A330243SDR AALA202509254327Oil System · leakingAIRCRAFT WAS GROUNDED: THIS APU IS LEAKING OIL INTO THE DUCTS AND CAUSED AN SOMKE ODORFUMES EVENT. MAINTENANCE REPLACED THE APU.Sep 21, 2025 · N764US · Airbus A319112SDR AALA202509220793Vent Line · leakingAIRCRAFT WAS GROUNDED: REPLACED APU GEARBOX VENT TUBE IAW AMM 49-26-55. R & R APU AIR-OIL SEPARATOR ASSY. IAW AMM 49-26-54.Sep 19, 2025 · N812AW · Airbus A319132SDR DXTA2025092205025Oil System · leakingSTRONG SMELL OF OIL COMING FROM THE OVERHEAD VENTS. WE RAN THE APU FOR 45 MINUTES WITH NO CHANGE. REPEAT WRITEUP. REMOVED APU DUE TO INTERNAL OIL LEAK AND REPLACED WITH AN INSPECTED APU. PERFORMED SYSTEM OPERATION AND LEAK CHECK, NO DEFECTS NOTED. SYSTEM LSep 19, 2025 · N238QS · Cndair CL6002B16SDR YENA2025092200955Cooling Fan · leakingFLT#552, MCO-BOS. "FUMES EVENT STRONG NASTY SOCK/OIL SMELL 6000' DESCENT -ISOLATE PROCEDURE PACK 1 OFF HELPED; COMPLIED WITH INFORMATION NOTICE 2017-T015,SECTION A,ISOLATED FAULT TO APU COOLING FAN LEAK.R+R APU COOLING FAN,PERFORMED LEVEL B/C DECONTAMINATION PSep 19, 2025 · N588JB · Airbus A320232SDR AALA202510029048Lubrication Unit · leakingAIRCRAFT WAS GROUNDED: IN CRUISE FLIGHT AT FL370, ONE HOUR INTO FLIGHT, FA NOTICED STRONG DIRTY SOCK ODOR IN AFT L LAVATORY. ODOR DISSIPATED AFTER 20 MINUTES. **SUPPLEMENTAL SDR FOR AALA202509229048. MAINTENANCE REPLACED OIL LUBE MODULE IAW AMM 49-91-45.Sep 18, 2025 · N818AW · Airbus A319132SDR CALA2025092209094Oil System · leakingWHILE RUNNING THE APU BLEED THERE IS A STRONG ODOR IN THE CABIN. TS APU FOR SOUCE OF ODOR/OIL LEAKS. ACCOMPLISHED AMM 21-00-01-002-001 REMOVAL OF OIL CONTAMINATION FROM THE AIR CONDITIONING AND PNEUMATIC SYSTEMS. RAN PACK FOR SEVERAL HOURS. ODOR IS NO LONGER Sep 18, 2025 · N57862 · Boeing 75733NSDR WX0A2025091932568Oil System · leaking(AIRCRAFT NOT GROUNDED) DIRTY SOCK SMELL BELOW 1000' DURING LANDING THROUGHOUT CABIN AND COCKPIT. / PERFORMED A32X-21-000-001 OIL TYPE SMELL TASK CARD, FOLLOWING STEP 3.A4.A PERFORMED AMM 21-00-00-615-802A LEVEL A DECONTAMINATION USING ENG BLEED. SMELL NOT PRESep 18, 2025 · N313NV · Airbus A319111SDR DALA2025091906869Probe · leakingAT THE GATE MSP DURING DEPLANING DIRTY SOCK ODOR REPORTED BY FAS . NEAR ROW 27A. APU AIR IN USE. AFTER 3+ MIN APU WARM UP. AFTER LANDING. C/W AMDS 0550-2002. FOUND APU INLET CONTAMINATED WITH OIL. CLASSIFIED AS LEEL B. C/W AMDS 4900-2001. FOUND APU OIL TEMP PSep 18, 2025 · N336NW · Airbus A320212SDR 7C7A2025091800039Apu · oil consumptionHIGH OIL CONSUMPTION AUTO SHUTDOWN ACTIVATEDSep 18, 2025 · N629NP · Boeing 7572B7SDR CALA2025091909047Cooling Fan · leakingCREW REPORTS AUTO SHUTDOWN OF APU AFTER CREW NOTICED & WAS INFORMED OF SMOKE & ODOR COMING FROM VENTILATION SYS. CREW SHUTDOWN PACS & APU BLEED FOLLOWED BY APU AUTO SHUTDOWN. STARTED APU, TURNED ON APU BLEED, TURNED PACKS 1 & 2 ON, APU OIL 2197 SMELL & SMOKE Sep 15, 2025 · N57862 · Boeing 75733NSDR AALA202509174089Oil System · leakingAIRCRAFT WAS GROUNDED: MUSTY, DIRTY SOCK ODOR THROUGHOUT ENTIRE AIRCRAFT IN FLIGHT REPORTED BY FLIGHT ATTENDANTS. THE ODOR WAS ALSO FAIRLY STRONG IN THE FLIGHT DECK. IT WASN'T NOTICEABLE ON THE GROUND WITH THE APU RUNNING. MAINTENANCE FOUND THE PLENUM SEAL LEASep 14, 2025 · N710UW · Airbus A319112SDR YENA2025091500931Oil System · leakingFLT#1383, GUA-FLL. "FUMES EVENT ON DECENT THROUGHT 10,000 FEET STUNK IN BACK LESS UP FRONT DIRTY SOCKS OIL; COMPLIED WITH INFORMATION NOTICE 2017-T015 SECTION B2 TYPE 1 APU AND PERFORMED DECONTAMINATION LEVEL B WAS ACCOMPLISHED PER TSM 05-50-00-810-831-A. AIRCSep 14, 2025 · N641JB · Airbus A320232SDR SWAA2025091012962Oil System · lowAPU LOW OIL PRESSURE, SERVICED APU GEARBOX REF AMM 12-13-31. OPS CHECK GOOD.Sep 9, 2025 · N7704B · Boeing 7377BDSDR HALA20250909275Filter · cloggedETOPS - APU AUTOSHUTDOWN PRIOR TO TOW TO GATE. APU LUBE AND SCAVANGE FILTERS INDICATED AS CLOGGED. REMOVED AND REPLACED LUB AND SCAVANGE FILTERS PER AMM 49-91-41. LEAK CHECK GOOD. OPS CHECK GOOD OF APU. OK FOR SERVICE.Sep 8, 2025 · N375HA · Airbus A330243SDR AALA202509098809Oil System · leakingAIRCRAFT WAS GROUNDED: SOF EVENT DURING DESCENT PASSING 25000 AND IDLE/LOW THRUST DESCENT. FAS REPORTED SMELL AS WELL. FUMES PREVALENT THROUGH MAJORITYOF DESCENT. OILY SMELL IN FLIGHT DECK AND SOUR MILK SMELL IN AFT CABIN. MAINTENANCE FOUND APU INLET SOAKED INSep 7, 2025 · N9018E · Airbus A319115SDR SWI2025F01192Fuel Line · leakingDURING CABIN CLOSE AND START UP. HEAVY FUMES STARTED TO BUILD IN CABIN. SMELLS LIKE JET FUEL. UNABLE TO DISSIPATE AND CONTINUE TO BECOME BREATHING HAZARD. BOTH PILOTS WERE GETTINGHEADACHE AND DECIDED TO RETURN TO GATE AND DEPLANE. AFTER TURNING EVERYTHING OFF Sep 6, 2025 · N937EV · Cndair CL6002B19SDR SWAA2025090912055O-Ring · leakingAPU AIR CAUSES SMOKE AND VAPOR TO FILL THE CABIN. FOUND APU OIL COOLER INPUT-OUTPUT LINES O-RINGS DAMAGED. REPLACED APU OIL COOLER LINE O-RINGS PER AMM 49-91-41. A/COK FOR SERVICE.Sep 5, 2025 · N8579Z · Boeing 7378H4SDR AALA202509039070Oil System · leakingAIRCRAFT WAS GROUNDED: UPON SOF TROUBLESHOOTING PER J/C 26L000021001. FOUND APU TO BE THE CAUSE OF THE ODOR. LEAKING FROM DRAIN MAST. MAINTENANCE REPLACED APU IAW J/C 26L31049003.Aug 31, 2025 · N127UW · Airbus A320214SDR I5PA2025083168804Transmitter · faultyAPU OIL QTY STATUS MSG. R & R APU OIL QTY TRANSMITTER PER AMM, OPS CHECK NORMAL.Aug 31, 2025 · N688SL · Boeing 757230SDR YENA2025009000901Line · leakingFLT#1952, MCO-BOS. "FUMES EVENT ON ARRIVAL AT 10,000 FT MUSTY DIRTY SCCK SMELL IN FLIGHT DECK AND FWD CABIN SMELL WENT AWAY WHEN #1 PACK TURNED OFF VIA PROCEDURE; INSPECTED A/C FOR OIL LEAK SIGNS. FOUND APU COOLING FAN TRANSFER TUBE LEAKING. R/R APU TRANSFER TAug 30, 2025 · N608JB · Airbus A320232SDR YENA2025082800892Oil Cooler · leakingFLT#1406, SDQ-MCO. "AFTER LANDING WE CHANGED OVER TO APU BLEED ON TAXIWAY. WE NOTICED A BURNING OIL SMELL UPON DOOR, INFLIGHT MONITORED THE SMELL WAS STRONG IN THE CABIN AS WELL; COMPLIED WITH INFO NOTICE 2017-T015-L SECTION B2. IDENTIFY ODOR SOURCE TO BE THE Aug 27, 2025 · N641JB · Airbus A320232SDR DALA2025082906390Generator · leakingDIRTY SOCK ODOR ON DECENT. INITIALY NOTICED AT 12000 FT AND DISSAPATED BY 5000 FT. FOUND LEAK ON APU GENERATOR, COMPLIED WITH T/C 7900-2001 & 0550-2002 AND LEVEL B REMOVAL OF THE CONTAMINATION OF THE ECS. REPLACED APU GENERATOR. (LP 7313472, 7313474)Aug 26, 2025 · N363DN · Airbus A321213SDR AALA202508279305Oil System · emptyAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: APU FAILED IN FLIGHT COULD NOT PROVIDED ENOUGH ELECTRICAL POWER WITH AN ENGINE GENERATOR ALREADY ON MEL. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT MIA.PARTIAL WORK ACCOMPLISHED BITE CHECK OF THE ECU FOUNAug 25, 2025 · N847NN · Boeing 737823SDR YENA2025082500875Pressure Switch · faultedFLT#32, AMS-BOS. (ETOPS) APU CLASS 2 MSG ( CLASS II MAINTENANCE MESSAGES DISPLAYED ); NO ACTIVE FAULTS. T/S PER TSM 49-00-81-810-868-A. ACCOMPLISHED CONTINUITY CHK OF LOW OIL PRESSURE SWITCH + A/C WIRING WITH NO DEFECTS. RESISTANCE SATISFACTORY/ WITHIN SPECIFAug 25, 2025 · N4073J · Airbus A321271NXSDR X7PA2025082300001Seal · leakingAIRCRAFT MADE A SCHEDULED DEPARTURE. DURING CLIMB OUT, SMOKE WAS NOTICED IN THE COCKPIT & CABIN BY BOTH THE FLIGHT CREW AND PASSENGERS. AIRCRAFT DECLARED AND EMERGENCY AND DIVERTED. AIRCRAFT LANDED WITHOUT INCIDENT. DURING INVESTIGATION AS TO THE CAUSE OF THE Aug 21, 2025 · N881VP · Cessna 560XLSDR DALA2025082206262Oil System · leakingAPU HAS INTERNAL OIL LEAK CAUSING SOME SMELL TO GET IN THE AIR CONDITIONING SYSTEM. REPLACED APU PER A330 AMM 49-01. OPS CHECK GOOD. (1155295)Aug 21, 2025 · N855NW · Airbus A330223SDR CALA2025081807861Oil System · overservicedFAULT LIGHT ON DURING APU START. SECOND ATTEMPT MADE AFTER CLEARING FAULT. PERFORMED APU ECB BITE IAW FIM 49-11 TASK 875 & NOTED LOW OIL PRESSURE FLAG ON LAST 3 RUNS. REJECTED HMG MUST WORK DISREGARD PREVIOUS CALL, CONFIG ISSUE, HMG CURRENTLY FUNCTIONAL OPSAug 15, 2025 · N77865 · Boeing 75733NSDR AALA202508111338Oil System · leakingAIRCRAFT WAS GROUNDED: OIL ODOR CAN BE SMELLED THROUGHOUT CABIN AND COCKPIT. MAINTENANCE FOUND OIL LEAKING FROM APU DRAIN MAST REF MIC 1418556. ACCOMPLISHED WC/ 26L00021001 . CONFIRMED ODOR WAS FROM APU. BOTH ENGINE BLEEDS FOUND ODORLESS. APU DEFERED PER MIC 1Aug 8, 2025 · N9010R · Airbus A319115SDR AALA202508197754Oil System · leakingAIRCRAFT WAS GROUNDED: STRONG MUSTY ODOR COMING FROM THE PACKS ON THE GROUND AND IN THE AIR. MX VERIFIED APU SOURCE, PLACED ON MEL. MAINTENANCE REPLACED APU IAW JC 26L31049003. COMPLIED WITH ENHANCED DECONTAMINATION OF ECS IAW JC 26L00021014.Aug 6, 2025 · N109UW · Airbus A320214SDR YENA2025080800818Oil System · leakingFLT#257, BOS-BZN. APU OILY ODOR / DIRTY SOCKS AFTER GATE ARRIVAL MILD ODOR IN FLIGHT DECK STRONG ODOR IN AFT CABIN IN GALLEY; COMPLIED WITH INFO NOTICE 2017-T015L SECTION B ISOLATED FAULT TO TYEP 1 EVIDENCE OF OIL LEAK IN APU INLET AREA PER TSM 05-50-00-810-0Aug 6, 2025 · N828JB · Airbus A320232SDR AALA202508056094Tube · leakingAIRCRAFT WAS GROUNDED: FUME EVENT STRONG CHEMICAL SMELL (SMELLS LIKE FERTILIZER) ON DESCENT AND THEN AGAIN ON THE GROUND WITH THE HIGH PRESSURE CART ATTACHED AND THE PACKS SELECTED ON. VERIFIED ENGINE OIL LEAKING OUT OF APU DRAIN MAST. VERIFIED ENGINE OIL LEAKAug 4, 2025 · N867NN · Boeing 737823SDR GTIA2025080439034Oil System · overserviced"IN CRUISE AT FL 35.0 SMELLED OIL SMELLY FUME , RAN QRH SHUT X BLEED AND TURNED OFF PACK 1 DID NOT SMELL AGAIN -PER GMM 30.40.3 FOUND FOUND TO BE ODOR EVENT STAGE 3. NO EVIDENCE OF APU OR ENGS OVERSERVICE. PER TSM 05-50-00-810-831-A FOUND #1 ENG AND PACK #1 SOAug 3, 2025 · N729NK · Airbus A321271NXSDR YENA2025080100794Oil System · leakingFLT#2709, JFK-SDQ. INFLIGHT CREW COMPLAINED OF ODOR THROUGHOUT CABIN STARTING ON SHORT FINAL AND GETTING WORSE AFTER SHUTDOWN . APU NOT RUNNING AT START OF ODOR EVENT; AFTER SPEAKING TO FLT CREW, THEY CLARIFIED ODOR WAS NOTICE BY INFLIGHT AT GROUND WHEN TAXINGJul 31, 2025 · N809JB · Airbus A321271NXSDR AALA202508036180Oil System · leakingAIRCRAFT WAS GROUNDED: VERY STRONG BURNED OIL LIKE SMELL, IN THE FLIGHT DECK. IT STARTED AT ABOUT 12000 FEET DURING DESCENT. MAINTENANCE FOUND THE APU WAS LEAKING OIL AND REPLACED IT PER TASK CARD 26L31049003. A DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSJul 30, 2025 · N193UW · Airbus A321211SDR DALA2025080105793Oil System · leakingDIRTY SOCK SMELL IN CABIN/COCKPIT. NO EXTERNAL OIL LEAKS FOUND. SUSPECT INTERNAL OIL LEAK. MEL/PLACARD 49-10-01A.Jul 28, 2025 · N344NW · Airbus A320212SDR DALA2025072905704Oil System · leakingSHIP 3261 DIRTY SOCK ODOR DETECTED WHEN CATERING AIRCRAFT. BEGAN INSPECTION PER TASK CARD 4900-2001, STEPS 1 & 2 COMPLETED. COMPLIED WITH STEP A, DEBRIEF FLIGHT CREW & ENSURE THE LOD PAGE IN ACCURATE. COMPLIED STEP B. COMPLIED WITH STEP C; ENSURE THE ELEC SJul 28, 2025 · N361NW · Airbus A320212SDR DALA2025072805619O-Ring · leakingAIRCRAFT 5005, ODOR IN CABIN & COCKPIT MORE PREVALENT AFTER APU BLEED FLIGHT ATTENDANT DESCRIBED AS " METALLIC". CORRECTIVE ACTION: FOUND LEAK COMING FROM INPUT LINE OFF OF OIL COOLER. REPLACED O-RING SEALS PER A321 AMM 49-91. PERFORMED LEVEL B REMOVAL OF ECS Jul 27, 2025 · N505DZ · Airbus A321271NXSDR DALA2025072605613Oil System · leakingSHIP 3161 - ATB/FUM - CREW ALERTED BY FAS OF FUMES IN AFT CABIN. RETURNED TO MCO. FOUND OIL RESIDUE IN APU INLET AND PLENUM MATING SURFACE. APU TO BE PLACED ON MEL FOR CLEANING. FOUND TRACE EVIDENCE OF OIL IN LT ACM. REPLACED ACM. DUE TO REPEAT EVENT, ECS LEJul 25, 2025 · N361NB · Airbus A319114SDR AALA202508040410Apu · contaminatedAIRCRAFT WAS GROUNDED: APU DETERMINED TO BE SOURCE OF ODOR. PLACED ON MEL. MAINTENANCE DECONTAMINATED APU PER JC 26L00021014.Jul 23, 2025 · N751UW · Airbus A319112SDR DALA2025072505602Apu · odorSHIP 3161 DIRTY SOCK SMELL STARTED AFT CABIN THEN SMELT THROUGHOUT CABIN. CORRECTIVE ACTION: FOUND APU AS SOURCE OF CONTAMINATION. DISCONTINUED USE. RESIDUAL CONTAMINATION FOUND ON LT ACM. REPLACED SAME. (1101511).Jul 23, 2025 · N361NB · Airbus A319114SDR GTIA2025072439006Oil System · leakingDIRTY SOCK SMELL ON DESCENT AND WITH APU RUNING. CONTINUOUS AND DISCOMFORTABLE, DIRTY SOCK / MUSTY DRY SMELL. APPARENT CABIN SOURCE: CABIN AIR SUPPLY VENTS. FLIGHT DECK. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.-REF. TSM 05-50-00-810-831-A PERFORMEJul 22, 2025 · N617NK · Airbus A320232SDR YENA2025072300755Switch · faultedFLT NR 1488, LAX-BOS. (ETOPS) APU AUTO SHUTDOWN (AUPSYSTEM A321NEO ETOPS); (RESOLVED ON W/O: 1427370 TASKCARD: NR-00004) REPLACED OIL PUMP DELTA P SWITCH IAW AMM 49-91-00 OPS & LEAKS CHECKS GOOD. ETOPS RESTRICTION STATUS REMOVED DUE TO NO FAULT REPORTED WITH AJul 22, 2025 · N2156J · Airbus A321271NX
Back to JASC 4990