JASC 4900

Service difficulty reports · 1,840

Reports filed under 4900 · Airborne Auxiliary Power Unit (APU) 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 = '4900'
  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 AALA202610228350Apu · odorAIRCRAFT WAS GROUNDED: DIRTY SOCK SMELL STARTED AFTER PUSH BACK AND CONTINUED THROUGHOUT THE AIRCRAFT DURING THE FLIGHT - MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU (OPEN)Oct 21, 2026 · N186US · Airbus A321211SDR AALA202610124788Apu · odorAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO MEM DUE TO THE FLIGHT CREW REPORTING A TOXIC ODOR IN THE FLIGHT DECK - THE AIRCRAFT LANDED SAFELY AT MEM WITHOUT FURTHER INCIDENT. (OPEN)Oct 11, 2026 · N934AA · Airbus A321231SDR AALA202610104335Vent Line · cokedAIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS REPORTED A CRAYON TYPE BURNING SMELL DURING APPROACH AND TAXI AFTER LANDING. SMELL DISSIPATED AFTER SINGLE ENGINE TAXI - MAINTENANCE FOUND THE APU GEARBOX VENT LINE HAD EVIDENCE OF COKING AND REPLACED IT *AALA2026101043Oct 7, 2026 · N932AM · Airbus A321231SDR DALA2026100805560Apu · odorODOR - APU PLACED ON MEL FOR SMOKE/FUME EVENT AND REQUIRES APU WASH. PERFORMED W/C 4916-2001 AND W/C 4900-2001. CLEANED AND INSPECTED APU REF W/C 4916-2001, CONTAMINATION NOTED AT APU AIR INTAKE AND PLENUM BEFORE CLEANING. RAN APU AFTER CLEANING FOR 20 MINUTEOct 4, 2026 · N369NW · Airbus A320212SDR YENA2026091800812Apu · odorFLT 323, JFK-LAX. IN FLIGHT, REPORTED CHEMICAL ODOR, APU ODOR EVENT SUSPECTED AFTER ENG RUNS CAME BACK WITH NO FINDINGS (APU SYSTEM ). C/W INFO NOTICE 2017-T015N, STEP 1 ISOLATED FAULT TO TYPE 10 LEVEL IAW TSM 05-50-00-810-085-B. AS A PRECAUTION, MEL APU IASep 16, 2026 · N967JT · Airbus A321231SDR DALA2026091105082Apu · odorBOARDING THE ACFT W/APU ON THERE IS A VERY STRONG DIRTY SOCK SMELL IN ALL AREAS OF THE COCKPIT AND CABIN, CORRECTIVE ACTION: R/R APU IAW W/C 4900-9901. (9518000) (AIRCRAFT GROUNDED).Sep 10, 2026 · N927AT · Boeing 717200SDR YENA2026090800735Apu · contaminatedFLT 1371, LGA-FLL. APU BLEED STRONG OIL ODOR IN FLIGHT DECK AND AFT CABIN. COMPLIED WITH INFO NOTICE 2017-T015 N AS TYPE 1 AND 2 IDENTIFIED ODOR AS TYPE 1 APU. DECONTAMINATION LEVEL B WAS ACCOMPLISHED IAW AMM 21-00-00-615-803. ACFT OK FOR SVC .Sep 7, 2026 · N584JB · Airbus A320232SDR AALA202609089848Apu · odorAIRCRAFT WAS GROUNDED: STRONG SOCK SMELL THROUGH 6,000 FT IN DESCENT WHICH CLEARED UP AFTER MAYBE A MINUTE - THE FLIGHT CREW REPORTED THAT DURING PREFLIGHT PREP FOR NEXT FLIGHT THE SMELL RETURNED MUCH STRONGER WITH IT BEING THE STONGEST IN THE FLIGHT DECK AND Sep 7, 2026 · N748UW · Airbus A319112SDR AALA202609061034Pressure Switch · faultedAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW DUE TO THE FLIGHT CREW REPORTING WITH ENGINE 1 IDG INOPERATIVE AND ON MEL THE APU AUTO SHUTDOWN WHILE PASSING FL 290 - THE AIRCRAFFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENTSep 3, 2026 · N539UW · Airbus A321231SDR SOKF2026090401Apu · odorAIRCRAFT WAS PARKED AT MGA STATION DURING PASSENGER BOARDING FOR FLIGHT AV397 FROM MGA TO SAL WHEN, FOLLOWING APU START, THE FLIGHT CREW REPORTED A STRONG SMOKE ODOR AND VISIBLE SMOKE. THE FLIGHT CREW ACCOMPLISHED THE QRH PROCEDURE SMOKE/FUMES AVIONICS SMOKE &Sep 3, 2026 · N689TA · Airbus A320214SDR AALA202609010725Vent Line · cokedAIRCRAFT WAS GROUNDED: MUSKY SOCK ODOR LAST 15 MINUTES OF FLIGHT IN BOTH FLIGHT DECK AND CABIN - MAINTNENANCE FOUND THE APU OIL COOLING FAN WAS LEAKING INTERNALLY AND REPLACED IT *AALA202609013204* MAINTENANCE ALSO FOUND THE APU GEARBOX VENT TUBE HAD EVIDENCE Aug 28, 2026 · N703UW · Airbus A319112SDR AALA202609013204Cooling Fan · leakingAIRCRAFT WAS GROUNDED: MUSKY SOCK SMELL LAST 15 MINUTES OF FLIGHT IN BOTH FLIGHT DECK AND CABIN - MAINTNENANCE FOUND THE APU OIL COOLING FAN WAS LEAKING INTERNALLY AND REPLACED IT *AALA202609013204* MAINTENANCE ALSO FOUND THE APU GEARBOX VENT TUBE HAD EVIDENCEAug 28, 2026 · N703UW · Airbus A319112SDR YENA2026082600707Apu · odorFLIGHT 397, BOS-SEA, FLIGHT ATENDANTS REPORTED A FUEL/ OIL ODOR ON CLIMBOUT, MODERATE INTENSITY OCCURRING IN THE AFT GALLEY COFFEEMAKER VENT. DISSIPATED AFTER 20 MINS. CW INFO NOTICE 2017-T015N AND IDENT ODOR TO BE TYPE 1 APU. PERFORMED ECS DECONTAMINATION LAug 26, 2026 · N903JB · Airbus A321231SDR CALA2026082418860Controller · faultedVIBRATION ON RT SIDE OF ACT, DID NOT FEEL IT BEHIND FIRST CLASS. WHILE STARTING BOTH ENGINES, FELT VIBRATION ONLY ON FIRST OFFICER`S SIDE OF THE FLT DECK. VIBRATION WENT AWAY DURING TAXI & TAKEOFF. IN CLIMB, FELT VIBRATION ON F/O SIDE OF FLT DECK ONLY. VIAug 21, 2026 · N674UA · Boeing 767322SDR YENA2026081400675Apu · odorFLT 1067, HPN-PBI, (DIVERTED TO JAX). COCKPIT ODOR EVENT ( PACKS ); COMPLIED WITH INFO NOTICE 20178-T015 ISOLATED FAULT TO TYPE 10 AMBIENT AIR, NO ODOR, NO 30 DAY HISTORY IAW TSM 05-50-00-810-085-B AS PRECAUTION PLACED PACK 1 ON MEL 21-52-01C, CAT C, MX 4 Aug 10, 2026 · N705JB · Airbus A320232SDR DALA2026081804717Apu · odorFUME- DURING APU ON DEPARTURE, NOTICED WET DOG SMELL MOMENTARILY ON CLIMB. STRONG AROMA ON DECENT. DONNED O2 MASKS. DETERMINE SOURCE OF ODOR IS FROM APU. APU DEFERRED INOPERATIVE. REPLACED RECIRC FILTERS. NO FURTHER ODORS. A/C RTS. LATER REPLACED APU. (LP 956Aug 8, 2026 · N325DU · Airbus BD5001A11SDR YENA2026080300642Apu · odorFLT 1098, MCO-BOS (AIRTURN BACK). DIRTY SOCK ODOR IN CABIN AND FLIGHT DECK, APU BLEED HAD BEEN ON FOR APPROX 10 MINS, ODOR BEGAN APPROX 5 MIN AFTER RAIN STARTED, ( APU BLEED AIR SUPPLY SYSTEM ) FUME EVENT COCKPIT & AFT CABIN TRIED ISOLATION CHECKLIST BUT COUJul 31, 2026 · N613JB · Airbus A320232SDR DALA2026072904389Apu · odorCREW MENTIONED DIRTY SOCK SMELL THROUGHOUT ALL PHASES OF FLIGHT. TURN ON APU BLEED AND SMELLED FUMES AROUND MID CABIN. PERFORMED P TRAK INITIAL RUNS REF AMDS 0550-2001 RESULTS SENT TO MCC (A. HERMS 948587) C/W MSI LOG 1723981 STEP'S A-G RECORD'S SENT TO MCC SJul 29, 2026 · N351NB · Airbus A319114SDR YENA2026071400574Apu · odorFLT 2144, PBI-EWR. DIRTY SOCKS ODOR WITH APU ON. C/W INFO NOTICE 2017-T015M IDENTIFIED AS TYPE 1 APU , ACCOMPLISHED LEVEL A DECONTAMINATION NO ODOR PRESENT AT THIS TIME PLACED APU ON MEL 49-10-01 CAT C MDDR PULLED & COLLARD C/B L-41 & L-42.Jul 13, 2026 · N618JB · Airbus A320232SDR AALA202607150312Sensor · leakingAIRCRAFT WAS GROUNDED: MUSTY SOCK SMELL DURING DESCENT AT 18,000'. FLIGHT CREW DID FUMES REMOVAL PROCEDURE AND FUMES DISSIPATED. MAINTENANCE ACCOMPLISHED SMOKE, ODOR, FUMES TROUBLESHOOTING TASK CARD 26L00021001 AND FOUND THE APU IGV DRAIN WITH SIGNS OF OIL LEAJul 12, 2026 · N818AW · Airbus A319132SDR UIEA2026062400535Duct · brokenAPU BLEED DUCT EXIT FLANGE FOUND BROKEN. APU BLEED DUCT REPLACED PER CUSTOMER REQUIREMENT EA-1949A004 APU LOAD COMPRESSOR EXIT DUCT DAMAGED BOLT HOLE REPAIR WORK CARD. NO FURTHER DEFECTS NOTED.Jun 27, 2026 · N868GT · Boeing 7478FSDR AALA202606284611Fcu · leakingAIRCRAFT GROUNDED: ON DESCENT, FLT ATTS REPORTED A STRONG ODOR IN AFT HALF OF CABIN. LIKENED TO ODOR OF EXHAUST. IT DISSIPATED AFTER LANDING. NO ODORS DETECTED IN FLT DECK OR FRWD HALF OF CABIN. MAINT REPLACED FCU IAW AMM 49-32-11. THE LUBE MODULE REPLACEDJun 23, 2026 · N908AA · Airbus A321231SDR CALA2026061917188Apu · odorMUSTY SOCK SMELL FROM PACKS W APU BLEED RUNNING OILY MUSTY SMELL WITH PACKS RUNNING ON APU. PLACED APU ON MEL MEL 4910B REJECTED NEED TO ADDRESS THE ODOR IN THE CABIN ACP INITIAL TROUBLE SHOOTING PER FIM TASK 05-50-00-810-831-A , CONFIRMED ORDER STRONG WHEN Jun 14, 2026 · N840UA · Airbus A319131SDR YENA2026052800490Apu · odorFLT#39, FLL-SJO. "CABIN ODOR ON DESCENT ( APU SYSTEM )" OPENMay 27, 2026 · N623JB · Airbus A320232SDR FDEA202605020532Apu · faultedWHEN I TRIED TO SWITCH FROM EXTERNAL POWER TO APU POWER, THE APU WOULDN T HOLD THE LOAD. EVERYTHING IN THE COCKPIT FLICKERED WITH AUDIBLE CLICKING AND GRINDING SOUNDS AND THERE WAS A STRONG ELECTRICAL BURNING ODOR. SWITCHED BACK TO EXTERNAL POWER AND THEMay 2, 2026 · N156FE · Boeing 7673S2FSDR AALA202604303690Apu · contaminatedAIRCRAFT WAS GROUNDED: FLIGHT ATTENDANT REPORTED A VERY STRONG PLASTIC NAIL POLISH SMELL IN THE AFT GALLEY. MAINTENANCE ACCOMPLISHED SMOKE / ODOR / FUME TROUBLESHOOTING TASK CARD 26L00021001 WITH NO FINDINGS NOTED. MAINTENANCE ALSO ACCOMPLSHED A DECONTAMINATIOApr 26, 2026 · N995AN · Airbus A321231SDR AALA202604284928Apu · contaminatedAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO GND DUE TO THE FLIGHT CREW REPORTING THAT AFTER TAKEOFF CLIMBING THROUGH 400' THERE WAS A VERY STRONG FUME EVENT IN FLIGHT DECK AND CABIN AFFECTING EYES, NOSE, THROAT AND CHEST. NO VApr 26, 2026 · N145AN · Airbus A321231SDR CALA2026050415934Apu · faultedON TAXI OUT SMOKE STARTED TO COME INTO THE COCKPIT. AFTER THAT THE LT PACK FAILED AND RAN THE CHECKLISTS. SMOKE CLEARED ONCE LT PACK WAS SECURED. FLIGHT CREW DEBRIEFED. FLIGHT CREW FOLLOWED SMOKE CHECKLIST. FLIGHT CREW FOUND LT PACK OFF LIGHT ILLUMINATED WHENApr 24, 2026 · N794UA · Boeing 777222SDR HNAA2026042300354Apu · odorSTRONG CHEMICAL SMELL ENTERED COCKPIT AND CABIN WHILE APU RUNNING. R & R APU IAW WC 49-80-05, OPS CK GOOD NO ABNORMAL SMELLS NOTED. CLEAR MEL.Apr 23, 2026 · N660CL · Emb EMB145LRSDR HNAA2026041500285Apu · odorSTRONG ODOR IN COCKPIT, NO REPORT FROM PREVIOUS CREW. NEW CREW REPORTED CHEMICAL ODOR WHEN ARRIVING TO THE A/C 1M MIN LATER. PLACED APU ON MEL 49-1.Apr 15, 2026 · N928AE · Emb EMB145LRSDR DALA2026040802231Apu · contaminatedDIRTY SOCK ODOR AFTER APU BLEED SELECTED. OPENED APU COMPARTMENT, SAW SIGNS OF OIL ON APU AND APU DOOR IAW AMM 49-00. RUN APU AND STILL GETTING ODOR AT HIS TIME. INSPECTED APU ACCESS DOOR AND COMPARTMENT FOUND NO EVIDENCE OF CONTAMINATION. REF MD LOG 1531675 Apr 7, 2026 · N373NW · Airbus A320212SDR DALA2026040602166Apu · odorAT 15000 FEET ON DESCENT DIRTY SOCK SMELL ALL WAY UNTIL SHUTDOWN. FLIGHT ATTENDANT SMELLED IT. FO PUT MASK ON AS PRECAUTION. EMERGENCY DECLARED. C/A: INSPECTED. OIL PRESENT IN APU COMPARTMENT. APU DEFERRED ON LOG 8423667. C/W MSI PREVENTION 2172. A- CREW NOT AApr 5, 2026 · N373NW · Airbus A320212SDR DALA2026040802227Apu · odorCREW REPORTS ON TAXI IN APU START HAD FUEL FUMES THROUGHOUT CABIN. REPLACED APU. (1528181) (AIRCRAFT GROUNDED)Apr 4, 2026 · N948AT · Boeing 717200SDR WX0A2026033032772Apu · odor(AIRCRAFT NOT GROUNDED) AFT FA'S REPORT A CHEMICAL OR DIRTY SOCK OR DIRTY SOCK SMELL ON APPROACH INTO KJKA. THEY REPORTED THE SMELL WAS NOTICABLE IN THE AFT GALLEY AND LAST FOR APPX 10 MIN / PERFORMED TC 21-000-001 AND FOUND SOURCE OF SMELLÏ¿½COMING FROM THEMar 27, 2026 · N320NV · Airbus A319111SDR YENA2026032300330Apu · contaminatedFLT 610. SDQ-JFK, ( APU BLEED AIR SUPPLY SYSTEM ) FA'S REPORTED FUMES SIMILAR TO HYD FLUID ON T/O FROM SDQ THAT STARTED IN THE AFT SEC OF D/C. SAME THING OCCURED ON FINAL APP. THE APU WAS OFF IN BOTH OCCURANCES NO PHYSICAL SYMPTONS REPORTED BY CREW. THE ODOMar 21, 2026 · N652JB · Airbus A320232SDR WX0A2026031632756Apu · odor(AIRCRAFT NOT GROUNDED) DIRTY SOCK SMELL ASCENDING THRU FL 210. DISSIPATED ON ITS OWN WITHIN A FEW MINUTES / PERFORMED TC A32X-21-000-001 AND FOUND SOURCE OF ODOR COMING FROM THE APU. PERFORMED LEVEL II DECONTAMINATION REF TASKCARD A32X-21-000-002. REMOVED & RMar 16, 2026 · N206NV · Airbus A320214SDR YENA2026031600307Apu · contaminatedFLT 259 BDL-FLL. DURING BOARDING ODOR IN CABIN AFTER TURNING APU BLEED ON.; COMPLIED WITH I/N 2017-T015 M. IDENTIFIED SOURCE OF ODOR TO APU. FOUND OIL SATURATION. PERFORMED LVL A ECS DECON (NO 30 DAY HISTORY). CABIN AIR QUALITY GOOD AFTER ECS DECON.Mar 13, 2026 · N561JB · Airbus A320232SDR SWIA2026031175509A/C Pack · odorINTERMITTENT ENGINE OIL ODOR IN CABIN/COCKPIT DURING CRUISE/DESCENT FROM VENTS. WENT AWAY AFTER BLEED SOURCE SWAPPED TO APU DURING DESCENT (FLIGHT 6068). TROUBLESHOT PER FIM 79-20-01 FOR ODORS IN INTERIOR OF THE ACFT. PERFORMED OPS CHECK OF BOTH PACKS IAW AMMar 11, 2026 · N983SW · Cndair CL6002B19SDR AALA202603131549Pressure Switch · fault messageAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO ICT DUE TO THE FLIGHT CREW REPORTING THAT DURING CRUISE APU FAILED IN FLIGHT AS IT WAS BEING USED AS A SECONDARY ELECTRICAL POWER SOURCE FOR AN INOPERATIVE #1 IDG CONFIGURATION (PER Mar 10, 2026 · N933AM · Airbus A321231SDR AALA202603121549Apu · abnormalAIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO ICT DUE TO THE FLIGHT CREW REPORTING THAT DURING CRUISE APU FAILED IN FLIGHT AS IT WAS BEING USED AS A SECONDARY ELECTRICAL POWER SOURCE FOR AN INOPERATIVE #1 IDG CONFIGURATION (PER Mar 10, 2026 · N933AM · Airbus A321231SDR YENA2026031100286Apu · odorFLT 1142 PBI-BDL, AFTER ROTATION AND THROUGHOUT THRUST REVOLUTION OIL ODOR IN COCKPIT. CABIN CREW DID NOT NOTICE THE ODOR. COMPLIED WITH INFO NOTICE 2017-T015, STEPS 1 AND 2. INDENTIFIED ODOR TYPE 1- APU DECONTAMINATION LEVEL C WAS ACCOMPLISHED PER AMM 36-10Mar 3, 2026 · N519JB · Airbus A320232SDR CALA2026030314213Apu · smokeAPU WILL NOT HOLD ELECTR ICAL POWER, GROUND CREW SAW A PUFF OF SMOKE FROM APU. FUMES IN FLT DECK STARTED APU IAW 49-11-00. VERIFIED NO SMOKE OR FUMES ON START. REMOVED GROUND POWER, APU CONTINUED TO RUN WITH NO ISSUES NO FOUL ODOR DETECTED.Mar 1, 2026 · N36280 · Boeing 737824SDR YENA2026022500238Apu · contaminatedFLT #1367 HPN-PBI. "AFT INFLIGHT SMELLED DIRTY SOCK SMELL AS SOON AS WE TOUCHED DOWN AND TAXIED TO THE GATE. THIS WAS AFTER APU STARTED CLEARING THE RUNWAY.;INSPECTED APU AREA FOUND SATURATED WITH TYPE 1 DE-ICE FLUID TO INCLUDE INTAKE & PLENUM. C/W INFO NOTICEFeb 25, 2026 · N562JB · Airbus A320232SDR HNAA2026022500157Apu · odorAFTER LANDING DURING APU START, JET FUEL SMELL IN FLT DECK AND IN CABIN FOR APPROX 20 SECONDS. APU AUXILIARY POWER UNIT FACT 25FEB26 04:09 PHL OPERATED APU AND ENGINES. NO JET FUEL SMELL PRESENT IN FLIGHT DECK AND CABIN IRT AMM 71-00-01. A/C OK FOR SEFeb 24, 2026 · N690AE · Emb EMB145LRSDR DALA2026030801598Apu · odorON TAXI IN, FLT ATTENDANTS NOTIFIED PILOTS OF A SMOKEY HAZE IN THE CABIN. IT WAS DESCRIBED AS SMELLING "FRUITY" AND LIKE " ANTI-FREEZE". PILOTS THEN GOT A CONDITION HOT AIR FAULT ECAM MESSAGE. APU WAS ON WITH, APU BLEED OFF. SHUT DOWN APU + ENGINES AND DISAPATFeb 23, 2026 · N370NW · Airbus A320212SDR KC8A202602230014Apu · odor5 MINUTES AFTER TAKEOFF, AIRCRAFT CABIN FILLED WITH WHITE SMOKE. SMOKE SMELLED LIKE OIL. NOT ELECTRICAL. AIRCRAFT RETURNED TO KYIP. SUSPECT APU OIL LEAK CAUSING THE SMOKE AND OIL ODOR TROUBLESHOOTING THE APU TO DETERMINE THE CAUSE AND CORRECTIVE ACTION.Feb 22, 2026 · N453CK · Lear 45LEARSDR YENA2026022300234Apu · odorFLT # 1169 JFK-JFK. " AFTER ENG 1 START ODOR DETECTED IN AFT GALLEY AND ROW 16. DIRTY SOCK SMELL. SMELL PERSISTED ON APU AND ENG BLEED.; REF L/P 4498623 ITEM #2 APU PLACED ON MEL DUE TO ODOR EVENT FOLLOWED BY A LEVEL B DECONTAMINATION OF THE BLEED AIR SYS. REFFeb 20, 2026 · N703JB · Airbus A320232SDR WX0A2026022032735Apu · odor(AIRCRAFT NOT GROUNDED) DIRTY SOCKS SMELL ON DECENT @ 12/L FT APU OFF AT TIME CONTINUED TO LAND. PERFORMED TASK CARD 21-000-002 COMPLETED THIS CLEARS MEL 48-10-01A MDDR 227029 PLACARDS REMOVED A/C OKAY FOR SERVICEFeb 19, 2026 · N309NV · Airbus A319111SDR YENA2026021700208Apu · odorFLT 438, MCO-BDL . STRONG OIL ODOR DURING CLIMBOUT & CRUISE, WENT AWAY FROM 35000 FT TO LANDING ,SMELLED A LEVEL 2 OIL ODOR. THIS PLANE HAS HISTORY. ( APU BLEED AIR SUPPLY SYSTEM ). RESOLVED ON W/O: 1477336 TASKCARD: NR-00002 PREVIOUSLY C/W ON LOGPAGE 44629Feb 17, 2026 · N643JB · Airbus A320232SDR YENA2026021700206Apu · odorFLT 994, DEN-BOS. DURING TAXI IN FLIGHT CREW AND CABIN CREW SMELLED ELECTRICAL/METALLIC ODOR. THIS WAS SHORTLY AFTER APU START UP. NO ABNORMAL INDICATIONS ASSOCIATED. ( AUXILIARY POWER UNIT (APU) SYSTEM ). FAULT ISOLATION PROCEDURES J21-22-00. INSPECTED APUFeb 14, 2026 · N3289J · Airbus BD5001A11
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