# SDR ASAA2016011114728

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 11, 2016
- Submitted: January 13, 2016
- Operation: Air carrier
- Aircraft: [N587AS](https://openairdocs.org/aircraft/N587AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35684
- Aircraft time: 31,746 hours, 9,280 cycles
- System (JASC): [2430 · DC Generating System](https://openairdocs.org/jasc/2430)
- Part: Warning Light
- Condition: False Activation
- Stage of operation: TX
- How discovered: 9
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016011114728

## Discrepancy

"ELECTRIC" LIGHT AND MASTER CAUTION ILLUMINATED AFTER SWITCHING POWER SOURCE FROM EXTERNAL TO APU.  ACFT GROUNDED.  PERFORMED FIM TASK 24-31, TASK 801, P5-13 PANEL BITE NORMAL WITHOUT FAULTS.  FOUND APU GCU UNABLE TO BITE. RERACKED APU GCU.  PERFORMED FIM TASK 24-21, TASK 801.  NO FAULTS FOUND.

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