# SDR ASAA2020081753027

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 15, 2020
- Submitted: August 18, 2020
- Operation: Air carrier
- Aircraft: [N469AS](https://openairdocs.org/aircraft/N469AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41702
- Aircraft time: 23,204 hours, 7,485 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Lubrication Unit
- Part number: 41310203
- Part serial: 7638
- Condition: Failed
- Location: Apu
- Part time: 6,985 hours, 13,089 cycles
- Stage of operation: CR
- 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/ASAA2020081753027

## Discrepancy

APU FAILED TO START AT FL370; 1ST ATTEMPT EGT ROSE TO 600 FAULT LIGHT ILLUMINATED APU SHUT DOWN ON ITS OWN, 2ND ATTEMPT 10 MINUTES LATER NO EGT, FAULT LIGHT, NO START.  GROUNDED - YES. REPLACED APU LUBE MODULE AND FUEL CONTROL UNIT, REF B737-900 AMM 49-91-11-000-803, 49-91-11-400-803, 49-31-11-000-801 AND 49-31-11-400-801.  OP'S AND LEAK CHECK GOOD.

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