# SDR ASAA2014022607004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 26, 2014
- Submitted: March 3, 2014
- Operation: Air carrier
- Aircraft: [N558AS](https://openairdocs.org/aircraft/N558AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35177
- Aircraft time: 29,469 hours, 8,678 cycles
- System (JASC): [3150 · Central Warning](https://openairdocs.org/jasc/3150)
- Part: Warning Light
- Condition: Illuminated
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2014022607004

## Discrepancy

WITH APU ON AND PROVIDING POWER EXTERNAL POWER DISCONNECTED CAUSED ALL POWER TO BE LOST. BATTERY PROVIDING POWER.  APU GEN OFF BUSS LIGHTS ON,  RECONNECTED APU TO BUSSES AND CDS FAULT LIGHT ILLUMINATED FOR APPROX 3 TO 4 MIN.  THEN WENT AWAY.  ACFT GROUNDED.  PERFORMAED APU OPS TEST, START, REF AMM 49-11-00-800-801.  BLUE LIGHT EXTINGUISHED.  NO FAULTS NOTED. CDS LIGHT NORMAL DURING DEU BOOT PROCESS REF FIM TASK 31-62, TASK 801,  PARA B.

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