# SDR ASAA2018120627267

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 6, 2018
- Submitted: December 11, 2018
- Operation: Air carrier
- Aircraft: [N464AS](https://openairdocs.org/aircraft/N464AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40714
- Aircraft time: 18,491 hours, 6,020 cycles
- System (JASC): [4960 · APU Controls](https://openairdocs.org/jasc/4960)
- Part: Ecu
- Part number: 707208601
- Part serial: 6505150200804
- Condition: Noise
- Location: Apu
- Part time: 18,505 hours, 6,024 cycles
- Stage of operation: NR
- 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/ASAA2018120627267

## Discrepancy

FA'S REPORT ABNORMAL NOISE COMING FROM AFT (GALLEY) AREA OF AIRCRAFT . GROUNDED - YES. REVIEWED HISTORY. ACCOMPLISHED FIM 49-55-808 NO CURRENT FAULTS. MAX APU EGT DURING MES WAS 475 DEGREES. NO OTHER DEFECTS NOTED. ACCOMPLISHED FIM 36-10-806. NO FAULTS WITH INITIAL EVAL. ISOLATION VALVE OPS CK GOOD. REMOVED AND REPLACED ECU REF B737-900 AMM 49-61-12/401. OPS CHECK GOOD. ACCOMPLISHED FIM 49-55-808 AND FIM 36-10-806. NO FAULTS.

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