# SDR ASAA2020082093043

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 19, 2020
- Submitted: August 20, 2020
- Operation: Air carrier
- Aircraft: [N442AS](https://openairdocs.org/aircraft/N442AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43293
- Aircraft time: 25,947 hours, 8,339 cycles
- System (JASC): [4997 · APU System Wiring](https://openairdocs.org/jasc/4997)
- Part: Connector
- Part number: UNKNOWN
- Condition: Loose
- Location: Apu Compartment
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020082093043

## Discrepancy

APU FAULT LIGHT ON AFTER ATTEMPTED RESTART.  GROUNDED - YES.  VERIFIED APU INOP, FAULT CODE 49-15217 (INLET DOOR SWITCH POWER SHOWS HIGH CURRENT), REF B737-900 FIM 49-10 TASK 809.  APU BITE SHOWS NO CURRENT FAULTS.  FOUND BACKSHELL LOOSE AND WIRE W4726-1003-20 CHAFING ON BACKSHELL AT CONNECTOR D1246.  RETERMINATED ALL THREE WIRES AT CONNECTOR D1246 AND RESECURED BACKSHELL REF B737-900 WDM 49-62-11 P.4 SH.3 AND B737 SWPM 20-61-11.  WIRING CHECKS GOOD, PER FIM 49-10 TASK 809.  APU SHOWS NO FAULTS IN CURRENT STATUS. RAN AND STOPPED APU, REF B737-900 AMM 49-11-00-860-802.  OPS CK GOOD WITH NO FAULTS.  GROUND VERIFICATION SUCCESSFUL.

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