# SDR ASAA2022011537189

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 15, 2022
- Submitted: January 19, 2022
- Operation: Air carrier
- Aircraft: [N596AS](https://openairdocs.org/aircraft/N596AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35688
- Aircraft time: 49,426 hours, 14,726 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Converter
- Part number: 1152426245
- Part serial: 110C1009
- Condition: Faulty
- Location: Apu
- Part time: 63,192 hours, 31,278 cycles
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022011537189

## Discrepancy

APU FAULT LT ILLUMINATED. GROUNDED - YES. REMOVED AND INSTALLED NEW SCU PER B737-800 AMM 49-41-61/401, OPS NORMAL. REMOVED AND INSTALLED NEW SPU PER AMM 49-41-71/401, OPS NORMAL, NO FAULTS FOUND. PER TECH SVC REQUEST DUE TO HISTORY REPLACED APU ENGINE HARNESS PER AMM 49-11-01. ALL OPS NORMAL GROUND VERIFICATION CHECKS GOOD.

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