# SDR ASAA12511492

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 30, 2012
- Submitted: May 3, 2012
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 14,408 hours, 4,589 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [4960 · APU Controls](https://openairdocs.org/jasc/4960)
- Part: Ecu
- Part number: 2118966222
- Part serial: 20G0765
- Condition: Failed
- Location: Apu
- Part time: 4,035 hours, 1,258 cycles
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA12511492

## Discrepancy

ATTEMPTED T/C NG 49, EO 03483 1 "NG APU ECU SOFTWARE UPDATE TO VERSION 5". UPDATED FAILED SOFTWARE, LOCKED UP AND WON'T RESET APU IS NOW INOPERATIVE DUE TO APU ECU LOCKED UP.  ACFT GROUNDED.  R & R APU ECU & OPS CHECKED GOOD REF AMM 49-61-12.

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