# Service difficulty reports: JASC 4940

A list on [JASC 4940](https://openairdocs.org/jasc/4940.md).

Reports filed under 4940 · APU Start/Ignition System, newest first.

Page 1 of 29 · 1,424 reports

- [SDR IXXA20261016100](https://openairdocs.org/sdr/IXXA20261016100.md): Starter · faulted · Oct 16, 2026 · N571AZ · Boeing 767332
  > AFTER ARRIVAL CREW REPORTED MELTING PLASTIC ODOR/SMOKE COMING FROM FLIGHT DECK CIRCUIT BREAKER PANEL AREA AND VENTS. SAME SMELL/SMOKE OBSERVED BY FIRE FIGHTERS AND CREW IN AIRCRAFT FOOTPRINT DOWNWIND OF APU VENT AND REAR BULK COMPARTMENT. HAD TO LEAVE FLIGHT D
- [SDR JR2R20260921477](https://openairdocs.org/sdr/JR2R20260921477.md): Block · debonded · Sep 21, 2026 · N88327 · Emb ERJ170200LR
  > RT APU IGNITOR CABLE BLOCK DISBONDED. REPAIRED
- [SDR SIMA20260814001](https://openairdocs.org/sdr/SIMA20260814001.md): Controller · faulted · Aug 14, 2026 · N788CJ · Emb ERJ170100SE
  > APU FAILED TWICE IN FLIGHT. FIRST RESTART WAS SUCCESSFUL, RAN FOR ABOUT 15 MINUTES. FAILED AGAIN. WITH IDG 2 OUT, DIVERTED TO CVG. EMERGENCY DECLARED, T/S IAW FIM 49-10-00-810-810-A. R & R ELECTRONIC STARTER CONTROLLER IAW ERJ 170 AMM 49-42-01. OPS CHECK GOOD.
- [SDR YENA2026081700685](https://openairdocs.org/sdr/YENA2026081700685.md): Starter · leaking · Aug 13, 2026 · N715JB · Airbus A320232
  > FLT # 234, BOS-MCO. OIL SMELL FORM 15000FT TO THE GROUND DID ISOLATION CHECKLIST WAITED 3 MIN TURNED ON AND ODOR WAS AT THE SAME LEVEL 2; COMPLIED WITH INFO NOTICE 2017-T015M. ITEM DEFERED PER MEL 49-10-01. M PROCEDURE C/W C/B L41 AND L42 PULLED AND COLLAR. R
- [SDR I5PA2026081119304](https://openairdocs.org/sdr/I5PA2026081119304.md): Ecu · faulty · Aug 11, 2026 · N193AN · Boeing 757223
  > APU FAILED TO START TWICE AFTER LANDING. REPLACED APU ECU IAW APPLICABLE AMM.
- [SDR DALA2026072104275](https://openairdocs.org/sdr/DALA2026072104275.md): Exciter · faulted · Jul 20, 2026 · N327DN · Airbus A321213
  > DIVERSION, DISPATCHED WITH RT IDG ON MEL, APU AUTO SHUTDOWN IN CRUISE AT FL330. RESTART ATTEMPTS NO HELP. DIVERTED TO JAX. REPLACED ECU. NO HELP. REPLACED EXCITER, LEAD AND IGNITER PLUG. CHECKS OK. REPLACED #2 ENGINE IDG. (LP 8739534 - AIRCRAFT WAS GROUNDED)
- [SDR I5PA2026062275706](https://openairdocs.org/sdr/I5PA2026062275706.md): Pressure Switch · faulted · Jun 23, 2026 · N757QM · Boeing 75729J
  > FLIGHT MGE301, APU INFLIGHT START FAILED. FOUND APU DIFF PRESSURE SWITCH FAULTY. R & R DIFFERENTIAL PRESSURE SWITCH IAW AMM. OPS CHECK NORMAL, APU VERIFICATION FLIGHT SUCCESSFUL.
- [SDR SWAA2026061511911](https://openairdocs.org/sdr/SWAA2026061511911.md): Starter Gen · failed · Jun 12, 2026 · N437WN · Boeing 7377H4
  > DURING PUSH, AFTER ENGINE START, AUDIBLE POP, POWER LOSS, & SMOKE ODOR IN COCKPIT & AFT GALLEY. CREW REPORTED ACFT WAS STILL ON APU GEN AT THE TIME OF POWER LOSS. INSPECTED APU GENERATOR AND FOUND DAMAGE & MELTED PLASTIC AT TERMINAL BOX. R & R APU STARTER
- [SDR DALA2026042902734](https://openairdocs.org/sdr/DALA2026042902734.md): Ecu · failed · Apr 26, 2026 · N998AT · Boeing 717200
  > APU AUTO SHUTDOWN PROCESS BEGAN. RAN THE QRH WITH NO FIRE VISIBLE. APU WAS SHUT DOWN. THERE WAS AN ELECTRICAL SMELL IN THE AFT CABIN. R/R APU ECU REF B717 AMM 49-61 (8304376) (AIRCRAFT GROUNDED)
- [SDR DALA2026040502160](https://openairdocs.org/sdr/DALA2026040502160.md): Starter · odor · Apr 4, 2026 · N103DY · Airbus A321211
  > DURING TAXI IN, AFTER TURNING ON APU BLEED AIR, WE NOTICED A STRONG ELECTRICAL BURNING ODOR. TURNED APU BLEED OFF & ODOR DISSIPATED. REPLACED APU STARTER IAW AMM 49-42. OPS CHECK GOOD. (LP 8560146)
- [SDR U5QA202603180168](https://openairdocs.org/sdr/U5QA202603180168.md): Apu · faulted · Mar 18, 2026 · N350VJ · Bombdr BD1001A10
  > APU FAILED TO START ON PAST 2 APPROACHES. CYAN APU SHUTDOWN CAS POSTED. ON SUBSEQUENT ATTEMPT AFTER LANDING THERE WAS A VERY STRONG SMELL OF FUEL IN THE CABIN. MX C/A: INSPECTED APU INLET AND APU IGNITER, APU INLET WAS CLEAR AND APU IGNITER WAS WITHIN LIMITS
- [SDR I5PA2026020888801](https://openairdocs.org/sdr/I5PA2026020888801.md): Brushes · worn · Feb 8, 2026 · N888LT · Boeing 757230
  > APU INOPERATIVE. FOUND APU STARTER BRUSHES WORN. R & R APU STARTER IAW AMM, OPS CHECKED NORMAL.
- [SDR I5PA2026012768802](https://openairdocs.org/sdr/I5PA2026012768802.md): Starter · faulty · Jan 27, 2026 · N688SL · Boeing 757230
  > APU FAULT. R & R APU STARTER IAW AMM 49-41-01. OPS CHECKED NORMAL.
- [SDR AALA202601293423](https://openairdocs.org/sdr/AALA202601293423.md): Starter · burned out · Jan 21, 2026 · N306RC · Boeing 7378
  > AIRCRAFT WAS GROUNDED: FLIGHT DECK AND CABIN CREW NOTICED A VERY POTENT SMELL THROUGHOUT AIRCRAFT. NOTICED IT BELOW 10K FEET ON DESCENT AND REMAINED UNTIL SHUTDOWN AT GATE. WHAT COULD BE DESCRIBED AS "BURNING PLASTIC" SMELL. **SUPPLEMENTAL REPORT FOR (AALA2026
- [SDR I5PA2025101375702](https://openairdocs.org/sdr/I5PA2025101375702.md): Ecu · faulty · Oct 13, 2025 · N757QM · Boeing 75729J
  > APU PNEUMATICS INOPERATIVE. R & R APU ECU PER AMM. OPS CHECKED NORMAL.
- [SDR CALA2025092909368](https://openairdocs.org/sdr/CALA2025092909368.md): Contactor · missing · Sep 25, 2025 · N664UA · Boeing 767322
  > APU CRANK CONTACTOR U/S ON FIT. APU CRANK CONTACTOR FOUND TO BE MISSING END STOP CAUSING CONTACTS TO BE MADE, NOTICED AFTER UNCOMMANDED APU START ON APU BATTERY CONNECTION. DEFECTIVE ON FIT APU CONTACTOR REPLACED AS PER AMM TASK 49-41-05-404-005. APU CRANK C
- [SDR HALA20250918281](https://openairdocs.org/sdr/HALA20250918281.md): Exciter · faulted · Sep 17, 2025 · N218HA · Airbus A321271N
  > ETOPS - APU AUTO SHUTDOWN ON TAXI IN. REMOVED AND REPLACED EXCITER - IGNITION BOX PER AMM 49-41-00. OPS CHECK GOOD. OK TO CONTINUE.
- [SDR YENA2025090900921](https://openairdocs.org/sdr/YENA2025090900921.md): Igniter · faulted · Sep 7, 2025 · N4048J · Airbus A321271NX
  > FLT#1621, LHR-BOS. (ETOPS), APU AUTO SHUTDOWN ON TAXI IN; REPLACED THE IGNITER PLUG IAW AMM 49-41-41. OPS TEST WAS PERFORMED IAW AMM 49-00-00.A/C IS OK FOR SVC.
- [SDR I5PA2025082219301](https://openairdocs.org/sdr/I5PA2025082219301.md): Starter · failed · Aug 22, 2025 · N193AN · Boeing 757223
  > APU STARTER FAILED. R & R APU STARTER PER AMM.
- [SDR HALA20250814247](https://openairdocs.org/sdr/HALA20250814247.md): Blanket · damaged · Aug 13, 2025 · N5879K · Airbus A330343
  > ETOPS - FOUND APU SURGE AIR DUCT THERMAL BLANKET DAMAGED. REMOVED AND REPLACED APU SURGE AIR DUCT THERMAL BLANKET IAW A330 AMM 49-41-52-420-050-A STEP 9K.
- [SDR NACA2025071600001](https://openairdocs.org/sdr/NACA2025071600001.md): Apu · faulted · Jul 25, 2025 · N379CX · Boeing 767323
  > APU WILL NOT START, AUTO ABORTS AT 45%
- [SDR DALA2025072405565](https://openairdocs.org/sdr/DALA2025072405565.md): Starter Gen · failed · Jul 22, 2025 · N3768 · Boeing 737832
  > (LOG 7394804) AT GATE APU GEN DROPPED OFFLINE ACCOMPANIED WITH AN ACRID ODOR/ BURNING SMELL IN COCKPIT + CABIN. REPLACED APU STARTER GEN REF B737 AMM 49-41.
- [SDR YENA2025072300753](https://openairdocs.org/sdr/YENA2025072300753.md): Apu · malfunctioned · Jul 21, 2025 · N4077J · Airbus A321271NX
  > FLT#834, SFO-BOS. (ETOPS) APU FAILED TO START IAW A49-00-01A 2 START ATTEMPS MADE OAT- 44 FL350; REMOVED AND REPLACED APU IGNITION EXCITER REF AMM 49-41-38 OPS CHECK GOOD.
- [SDR DALA2025072405576](https://openairdocs.org/sdr/DALA2025072405576.md): Ecu · faulted · Jul 20, 2025 · N550NW · Boeing 757251
  > SHIP 5650 - ATO - REJECTED TAKEOFF BELOW 80 KTS DUE TO APU FAULT DURING NO BLEED TAKEOFF. CORRECTIVE ACTION: APU PLACED ON MEL FOR DC POWER LOSS FAULT. PERFORMED HIGH ENERGY STOP INSPECTION. NO DEFECTS FOUND. LATER, REPLACED APU ECU AND APU BATTERY BUS CIRCUIT
- [SDR HALA20250721226](https://openairdocs.org/sdr/HALA20250721226.md): Insert · damaged · Jul 20, 2025 · N396HA · Airbus A330243
  > ETOPS - APU FAULT UPON APU START. REMOVED AND REPLACED ECB AND CONDITION SAME. RE-INSTALLED THE ORIGINAL ECB PER AMM 49-71-04. REMOVED/REPLACED IGV ACTUATOR PER AMM 49-23-51. UPON REPLACEMENT OF IGV ACTUATOR, FOUND PNEUMATIC LINE TO THE TOTAL PRESSURE PROBE LO
- [SDR HALA20250721224](https://openairdocs.org/sdr/HALA20250721224.md): Pin · out of limits · Jul 18, 2025 · N209HA · Airbus A321271N
  > ETOPS - APU AUTOSHUTDOWN ON TAXI INTO GATE. FOUND STARTER WEAR PIN BEYOND LIMITS. REMOVED AND REPLACED STARTER PER AMM 49-42-51. OPS CHECK GOOD. OK FOR SVC.
- [SDR DALA2025071405271](https://openairdocs.org/sdr/DALA2025071405271.md): Starter Gen · inoperative · Jul 11, 2025 · N895DN · Boeing 737932ER
  > (LOG 7444640) FUMES AND SMOKE DETECTED. A/C WAS ON APU PWR/AIR AND APU PWR DROPPED AS SMOKE WAS DETECTED. REMOVED AND REPLACED APU STARTER GENERATOR PER B737 AMM 49-41. OPS CHECK GOOD. REMOVED AND REPLACED RE-CIRC FILTERS.
- [SDR I5PA2025070429301](https://openairdocs.org/sdr/I5PA2025070429301.md): Exciter · faulted · Jul 2, 2025 · N193AN · Boeing 757223
  > FLT NO: MGE 402, APU FAULT ON THE GROUND, UNABLE TO START APU. PERFORMED ECU BITE TEST, MINI FLAGS 28 AND 91. ISOLATED ISSUE TO APU EXCITER. MX R/R APU EXCITER, OPS CHECK.
- [SDR I5PA2025062768806](https://openairdocs.org/sdr/I5PA2025062768806.md): Igniter · faulted · Jun 27, 2025 · N688SL · Boeing 757230
  > FLT: MGE 300, ESI. APU FAULT ON TAXI IN. TROUBLESHOT PER FIM 49-11 FT 852. R & R APU IGN PLUG. OPS CHK OK.
- [SDR I5PA2025062768805](https://openairdocs.org/sdr/I5PA2025062768805.md): Exciter · faulty · Jun 27, 2025 · N688SL · Boeing 757230
  > FLT: MGE 300, ESI. APU FAULT ON TAXI IN. TROUBLESHOT PER FIM 49-11 FT 852. R/R APU IGN EXCITER. OPS CHK OK.
- [SDR NACA2025062400001](https://openairdocs.org/sdr/NACA2025062400001.md): Starter · failed · Jun 24, 2025 · N563NC · Boeing 7673BG
  > APU WILL NOT START. REMOVED AND REPLACED APU STARTER IAW AMM 49-41-01 OPS CHECK NORMAL.
- [SDR NACA2025072800001](https://openairdocs.org/sdr/NACA2025072800001.md): Apu · hung start · Jun 11, 2025 · N565NC · Boeing 7673BG
  > TROUBLESHOOT APU HUNG START AT 51% N1. REMOVED AND REPLACED APU IAW AMM 49-11-01-404-085
- [SDR HALA20250609171](https://openairdocs.org/sdr/HALA20250609171.md): Exciter · faulted · Jun 7, 2025 · N389HA · Airbus A330243
  > ETOPS - ON START UP ECAM APU FAULT AUTO SHUTDOWN. REPLACED FLOW DIVIDER ASSY PER AMM 49-31-51. CONDITION SAME. REMOVED AND REPLACED EXCITER BOX QND IGNITOR PLUGS PER AMM 49-41-38 AND 49-41-41. OPS CHECK GOOD. NO FAULTS FOUND. OK FOR SVC.
- [SDR HALA20250609168](https://openairdocs.org/sdr/HALA20250609168.md): Starter · faulted · Jun 6, 2025 · N214HA · Airbus A321271N
  > ETOPS - APU AUTOSHUTDOWN 3 TIMES. REMOVED AND REPLACED STARTER ON APU PER AMM 49-42-51. REPLACED CLUTCH PER AMM 49-42-51. REPAIRED DAMAGED WIRE PER E105 -C30086-INI OPS CHECK GOOD OK TO CONTINUE
- [SDR HALA20250602160](https://openairdocs.org/sdr/HALA20250602160.md): Igniter · faulted · Jun 1, 2025 · N396HA · Airbus A330243
  > ETOPS - APU FAULT ON TAXI INTO GATE. APU AUTO SHUTDOWN. BITE TEST SHOWS CLASS 2 IGN PLUG/ IGN EXCITER MESSAGE, REMOVE AND REPLACE BOTH APU IGN PLUG PER AMM 49-41-41/201 & OPS CHECK GOOD, CYCLED 4 TIMES WITH NO DEFECTS NOTED, BITE TEST OK, NO MESSAGES DISPLAYED
- [SDR HALA20250602157](https://openairdocs.org/sdr/HALA20250602157.md): Igniter · faulted · May 30, 2025 · N226HA · Airbus A321271N
  > ETOPS - APU AUTO SHUT DOWN TWICE CALLED MX, SHUT DOWN THRID TIME ALSO NOTICED FUEL SLOWLY DRIPPING FROM APU DRAIN MAST. REMOVED AND REPLACD APU IGNTIER PLUG PER AMM 49-41-41 AND APU IGNITION UNIT PER AMM 49-41-38. OPS AND LEAK CHK GOOD. OK FOR SVC
- [SDR HALA20250527151](https://openairdocs.org/sdr/HALA20250527151.md): Igniter · faulted · May 24, 2025 · N209HA · Airbus A321271N
  > ETOPS - APU AUTO SHUTDOWN. REMOVED AND REPLACED APU IGNITER PLUG PER AMM 49-41-41. REMOVED AND REPLACED IGNITION UNIT PER AMM 49-41-38. OP'S CHECK GOOD. NO DEFECTS NOTED. OK FOR SERVICE.
- [SDR YENA2025052700534](https://openairdocs.org/sdr/YENA2025052700534.md): Igniter · failed · May 23, 2025 · N4048J · Airbus A321271NX
  > FLT#1908, CDG-JFK. (ETOPS) 'ON START AFTER LANDING APU AUTO SHUTDOWN. HUNG AT 20%. NO EGT INCREASE; REMOVED AND REPLACED APU IGNITER PLUG W/REF TO AMM 49-41-41. PERFORMED OPS CHECK OF APU, NO FAULT NOTED. A/C OK FOR SVC.'
- [SDR CALA2025052604938](https://openairdocs.org/sdr/CALA2025052604938.md): Starter · faulted · May 22, 2025 · N14120 · Boeing 757224
  > APU FAULT NO START APU WILL NOT START. WHILE INSPECTING APU FOUND BLOWN BOOT LT SIDE OF APU FROM SURGE VALE. FOUND APU COLD SOAKED, STARTER EXTREMELY HOT TO TOUCH. STRONG ODOR POSSIBLE STARTER ISSUE. *DM* REFERENCE FIM 49-11 FAULT TREE 875 AND DOCUMENT RESULT
- [SDR HALA20250520143](https://openairdocs.org/sdr/HALA20250520143.md): Exciter · faulted · May 19, 2025 · N205HA · Airbus A321271N
  > ETOPS - APU START FAILED 3 TIMES WHEN ATTEMPTING TO START AFTER LANDING. ECAM VERIFIED AUTO SHUTDOWN EACH TIME. FOLLOWED TSM 49-00-81-810-825,REMOVED AND REPLACED IGNITION EXCITER PER AMM 49-41-38 AND REMOVED & REPLACED IGNITER PLUG PER AMM 49-41-41. OPS CHECK
- [SDR HALA20250519139](https://openairdocs.org/sdr/HALA20250519139.md): Shaft · sheared · May 17, 2025 · N375HA · Airbus A330243
  > ETOPS - APU FAULT. FOUND STARTER SHAFT SHEARED. REMOVED AND REPLACED STATER PER AMM 49-42-51. REPLACED STARTER CLUTCH MODULE AS PRECAUTIONARY PER AMM 49-42-41. OPS AND LEAK CHECK GOOD.
- [SDR HALA20250507128](https://openairdocs.org/sdr/HALA20250507128.md): Ecb · failed · May 6, 2025 · N382HA · Airbus A330243
  > ETOPS - APU FAILED TO START. REMOVED AND REPLACED APU ECB PER AMM 49-61-34. OPS CHECK GOOD, NO DEFECTS NOTED. OK FOR SERVICE.
- [SDR HALA20250505122](https://openairdocs.org/sdr/HALA20250505122.md): Igniter · faulted · May 2, 2025 · N382HA · Airbus A330243
  > ETOPS - APU FAULT. APU AUTO SHUTDOWN. REMOVED AND REPLACED FCU PER AMM 49-32-51. CONDITION SAME. REMOVED AND REPLACED IGNITER PLUGS A AND B REF AMM 49-41-41. REMOVED AND REPLACED APU IGNITION EXCITER REF AMM 49-41-38. OPS CHK GOOD. OK FOR SVC.
- [SDR HALA20240421109](https://openairdocs.org/sdr/HALA20240421109.md): Igniter · faulted · Apr 18, 2025 · N205HA · Airbus A321271N
  > ETOPS-APU AUTO SHUTDOWN X2. REPLACED IGNITION UNIT & IGNITER PLUG PER AMM 49-41-38/ AMM 49-41-41. APU ECB TEST GOOD + OPS TEST GOOD. OK FOR SVC.
- [SDR HALA20250416108](https://openairdocs.org/sdr/HALA20250416108.md): Igniter · failed · Apr 15, 2025 · N208HA · Airbus A321271N
  > ETOPS-BTB: APU FAIL. REPLACED APU IGNITOR PLUG AND LEAD REF AMM 49-41-41 AND 49-41-43, OPS TEST NORMAL. OK FOR SVC.
- [SDR HALA20250404099](https://openairdocs.org/sdr/HALA20250404099.md): Fuse · inoperative · Apr 3, 2025 · N375HA · Airbus A330243
  > ETOPS - APU AUTO SHUTDOWN (2-ATTEMPTS). FOUND FUSE FIN 6KA1 INOP-REMOVED AND REPLACED FUSE PER AMM 49-42-00 AND ACCOMPLISHED PRECAUTIONARY STARTER CHANGE DUE TO PREVIOUS SHUTDOWNS PER AMM 49-42-51. OPS CHECK GOOD.
- [SDR NACA2025022300001](https://openairdocs.org/sdr/NACA2025022300001.md): Igniter · failed · Feb 23, 2025 · N566NC · Boeing 7673BG
  > APU FAULT ON APPROACH AND ON GROUND. REMOVED AND REPLACED THE IGNITER PLUG IAW AMM 49-41-02, REMOVED AND REPLACED THE IGNITION LEAD IAW AMM 49-41-04 AND REMOVED AND REPLACED THE IGNITION UNIT IAW AMM 49-41-03.
- [SDR CALA2025020702230](https://openairdocs.org/sdr/CALA2025020702230.md): Apu · faulted · Feb 3, 2025 · N17312 · Boeing 7378
  > MAINT LIGHT ILL AS SOON AS MCD CLOSEDSTATUS PAGE SHOWS APU GEN FAULT MSG 49-41244 REQ TO MEL 4911A DISPATCH DESK: 93 NAME: NL DATE: 03-FEB-25- NOC DESK: 737 NAME: MM DATE: 03-FEB-25- MEL 4911A APPROVED. UPON CLEARING THIS MEL ITEM, CONTACT TOMC FOR
- [SDR NACA2025012300001](https://openairdocs.org/sdr/NACA2025012300001.md): Ignition Lead · failed · Jan 23, 2025 · N565NC · Boeing 7673BG
  > APU FAULT ON STARTUP. REPLACED APU IGNITION LEAD PER AMM 49-41-04, APU STARTED OPS CHECK GOOD.
- [SDR HALA20250121027](https://openairdocs.org/sdr/HALA20250121027.md): Motor · faulty · Jan 20, 2025 · N384HA · Airbus A330243
  > ETOPS - APU WILL NOT START. REMOVED AND REPLACED APU STARTER MOTOR I.A.W. AMM 49-42-51-400-801-A. NO DEFECTS NOTED AT THIS TIME. A/C OK TO CONTINUE.

Next page: https://openairdocs.org/jasc/4940/reports.md?page=2

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
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 = '4940'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/jasc/4940/reports

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