# SDR ASAA2023080544523

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 5, 2023
- Submitted: August 11, 2023
- Operation: Air carrier
- Aircraft: [N948AK](https://openairdocs.org/aircraft/N948AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44090
- Aircraft time: 3,361 hours, 967 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Power Unit
- Part number: 1152464265
- Part serial: 115246407870
- Condition: Faulty
- Location: E/E Shelf E2-2
- Part time: 3,361 hours, 967 cycles
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023080544523

## Discrepancy

TECHNICAL SERVICES REQUEST APU FAULT REVIEW----(#PRI2/ETOPS)----. GROUNDED - YES. 49 FAULT HISTORY: FAULT 49-41255, START POWER UNIT SHOWS HIGH TEMP DETECTED BY APU CONTROLLER. ON  LEGS 1 THROUGH 12.  PER B737-9 FIM 49-40-00-810-819. REMOVED AND REPLACED APU START POWER UNIT REF B737-9 AMM 49-41-71/401. ALL OP TESTS PASS. FAULT CODE 49-41255 DOES NOT SHOW IN EXISTING FAULTS. ETOPS GROUND VERIFICATION SUCCESSFUL.

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