# JASC 4940: APU Start/Ignition System

- Type: JASC system/component code (FAA)
- ATA chapter: 49 Airborne Auxiliary Power
- Title in the code table: APU START/IGNITION SYSTEM
- Service difficulty reports: 1,424
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=44
- Page: https://openairdocs.org/jasc/4940

## What it covers

The system units used to start the APU engine. Including the unit which provides a power source to the igniter during the starting cycle. Typical parts are ignition unit, magneto, igniter, starter, etc.

## Latest service difficulty reports

- [SDR IXXA20261016100](https://openairdocs.org/sdr/IXXA20261016100), Oct 16, 2026: STARTER, FAULTED (N571AZ)
- [SDR JR2R20260921477](https://openairdocs.org/sdr/JR2R20260921477), Sep 21, 2026: BLOCK, DEBONDED (N88327)
- [SDR SIMA20260814001](https://openairdocs.org/sdr/SIMA20260814001), Aug 14, 2026: CONTROLLER, FAULTED (N788CJ)
- [SDR YENA2026081700685](https://openairdocs.org/sdr/YENA2026081700685), Aug 13, 2026: STARTER, LEAKING (N715JB)
- [SDR I5PA2026081119304](https://openairdocs.org/sdr/I5PA2026081119304), Aug 11, 2026: ECU, FAULTY (N193AN)
- [SDR DALA2026072104275](https://openairdocs.org/sdr/DALA2026072104275), Jul 20, 2026: EXCITER, FAULTED (N327DN)
- [SDR I5PA2026062275706](https://openairdocs.org/sdr/I5PA2026062275706), Jun 23, 2026: PRESSURE SWITCH, FAULTED (N757QM)
- [SDR SWAA2026061511911](https://openairdocs.org/sdr/SWAA2026061511911), Jun 12, 2026: STARTER GEN, FAILED (N437WN)
- [SDR DALA2026042902734](https://openairdocs.org/sdr/DALA2026042902734), Apr 26, 2026: ECU, FAILED (N998AT)
- [SDR DALA2026040502160](https://openairdocs.org/sdr/DALA2026040502160), Apr 4, 2026: STARTER, ODOR (N103DY)
- [SDR U5QA202603180168](https://openairdocs.org/sdr/U5QA202603180168), Mar 18, 2026: APU, FAULTED (N350VJ)
- [SDR I5PA2026020888801](https://openairdocs.org/sdr/I5PA2026020888801), Feb 8, 2026: BRUSHES, WORN (N888LT)
- [SDR I5PA2026012768802](https://openairdocs.org/sdr/I5PA2026012768802), Jan 27, 2026: STARTER, FAULTY (N688SL)
- [SDR AALA202601293423](https://openairdocs.org/sdr/AALA202601293423), Jan 21, 2026: STARTER, BURNED OUT (N306RC)
- [SDR I5PA2025101375702](https://openairdocs.org/sdr/I5PA2025101375702), Oct 13, 2025: ECU, FAULTY (N757QM)
- [SDR CALA2025092909368](https://openairdocs.org/sdr/CALA2025092909368), Sep 25, 2025: CONTACTOR, MISSING (N664UA)
- [SDR HALA20250918281](https://openairdocs.org/sdr/HALA20250918281), Sep 17, 2025: EXCITER, FAULTED (N218HA)
- [SDR YENA2025090900921](https://openairdocs.org/sdr/YENA2025090900921), Sep 7, 2025: IGNITER, FAULTED (N4048J)
- [SDR I5PA2025082219301](https://openairdocs.org/sdr/I5PA2025082219301), Aug 22, 2025: STARTER, FAILED (N193AN)
- [SDR HALA20250814247](https://openairdocs.org/sdr/HALA20250814247), Aug 13, 2025: BLANKET, DAMAGED (N5879K)
- [SDR NACA2025071600001](https://openairdocs.org/sdr/NACA2025071600001), Jul 25, 2025: APU, FAULTED (N379CX)
- [SDR DALA2025072405565](https://openairdocs.org/sdr/DALA2025072405565), Jul 22, 2025: STARTER GEN, FAILED (N3768)
- [SDR YENA2025072300753](https://openairdocs.org/sdr/YENA2025072300753), Jul 21, 2025: APU, MALFUNCTIONED (N4077J)
- [SDR DALA2025072405576](https://openairdocs.org/sdr/DALA2025072405576), Jul 20, 2025: ECU, FAULTED (N550NW)
- [SDR HALA20250721226](https://openairdocs.org/sdr/HALA20250721226), Jul 20, 2025: INSERT, DAMAGED (N396HA)
- [SDR HALA20250721224](https://openairdocs.org/sdr/HALA20250721224), Jul 18, 2025: PIN, OUT OF LIMITS (N209HA)
- [SDR DALA2025071405271](https://openairdocs.org/sdr/DALA2025071405271), Jul 11, 2025: STARTER GEN, INOPERATIVE (N895DN)
- [SDR I5PA2025070429301](https://openairdocs.org/sdr/I5PA2025070429301), Jul 2, 2025: EXCITER, FAULTED (N193AN)
- [SDR I5PA2025062768806](https://openairdocs.org/sdr/I5PA2025062768806), Jun 27, 2025: IGNITER, FAULTED (N688SL)
- [SDR I5PA2025062768805](https://openairdocs.org/sdr/I5PA2025062768805), Jun 27, 2025: EXCITER, FAULTY (N688SL)
- [SDR NACA2025062400001](https://openairdocs.org/sdr/NACA2025062400001), Jun 24, 2025: STARTER, FAILED (N563NC)
- [SDR NACA2025072800001](https://openairdocs.org/sdr/NACA2025072800001), Jun 11, 2025: APU, HUNG START (N565NC)
- [SDR HALA20250609171](https://openairdocs.org/sdr/HALA20250609171), Jun 7, 2025: EXCITER, FAULTED (N389HA)
- [SDR HALA20250609168](https://openairdocs.org/sdr/HALA20250609168), Jun 6, 2025: STARTER, FAULTED (N214HA)
- [SDR HALA20250602160](https://openairdocs.org/sdr/HALA20250602160), Jun 1, 2025: IGNITER, FAULTED (N396HA)
- [SDR HALA20250602157](https://openairdocs.org/sdr/HALA20250602157), May 30, 2025: IGNITER, FAULTED (N226HA)
- [SDR HALA20250527151](https://openairdocs.org/sdr/HALA20250527151), May 24, 2025: IGNITER, FAULTED (N209HA)
- [SDR YENA2025052700534](https://openairdocs.org/sdr/YENA2025052700534), May 23, 2025: IGNITER, FAILED (N4048J)
- [SDR CALA2025052604938](https://openairdocs.org/sdr/CALA2025052604938), May 22, 2025: STARTER, FAULTED (N14120)
- [SDR HALA20250520143](https://openairdocs.org/sdr/HALA20250520143), May 19, 2025: EXCITER, FAULTED (N205HA)
- [SDR HALA20250519139](https://openairdocs.org/sdr/HALA20250519139), May 17, 2025: SHAFT, SHEARED (N375HA)
- [SDR HALA20250507128](https://openairdocs.org/sdr/HALA20250507128), May 6, 2025: ECB, FAILED (N382HA)
- [SDR HALA20250505122](https://openairdocs.org/sdr/HALA20250505122), May 2, 2025: IGNITER, FAULTED (N382HA)
- [SDR HALA20240421109](https://openairdocs.org/sdr/HALA20240421109), Apr 18, 2025: IGNITER, FAULTED (N205HA)
- [SDR HALA20250416108](https://openairdocs.org/sdr/HALA20250416108), Apr 15, 2025: IGNITER, FAILED (N208HA)
- [SDR HALA20250404099](https://openairdocs.org/sdr/HALA20250404099), Apr 3, 2025: FUSE, INOPERATIVE (N375HA)
- [SDR NACA2025022300001](https://openairdocs.org/sdr/NACA2025022300001), Feb 23, 2025: IGNITER, FAILED (N566NC)
- [SDR CALA2025020702230](https://openairdocs.org/sdr/CALA2025020702230), Feb 3, 2025: APU, FAULTED (N17312)
- [SDR NACA2025012300001](https://openairdocs.org/sdr/NACA2025012300001), Jan 23, 2025: IGNITION LEAD, FAILED (N565NC)
- [SDR HALA20250121027](https://openairdocs.org/sdr/HALA20250121027), Jan 20, 2025: MOTOR, FAULTY (N384HA)

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From OpenAirDocs.org, an independent open copy of FAA data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.