# SDR ASAA2023032442698

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 24, 2023
- Submitted: April 4, 2023
- Operation: Air carrier
- Aircraft: [N469AS](https://openairdocs.org/aircraft/N469AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41702
- Aircraft time: 32,425 hours, 10,305 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Module
- Part number: 41310203
- Part serial: 6033
- Condition: Faulty
- Location: Apu
- Part time: 14,370 hours, 22,635 cycles
- Stage of operation: CR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023032442698

## Discrepancy

PERFORMED CSS APU START. FIRST TWO ATTEMPTS FAILED AT FL350, FAULT LIGHT ON FIRST, LOW OIL PRESSURE ON SECOND. APU STARTED ON 3RD ATTEMPT AT FL310. GROUNDED - YES. REMOVED AND REPLACED APU LUBE MODULE. REF B737-900 AMM 49-91-11.

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