# SDR ASAA2020121233674

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 12, 2020
- Submitted: December 15, 2020
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 53,983 hours, 15,775 cycles
- System (JASC): [3150 · Central Warning](https://openairdocs.org/jasc/3150)
- Part: Warning Light
- Condition: False Activation
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020121233674

## Discrepancy

ELEC LIGHT ILLUMINATED UPON MASTER CAUTION RECALL, AFTER ENGINE START AND TRANSFER BUSSES COVERED BY RESPECTIVE ENGINE GEN.  GROUNDED-YES.  PERFORMED ELEC LIGHT BITE TEST, PER B737-800 FIM 24-31 TASK 801, FAULT CLEARED.  FOUND FAULTS APU BATTERY AUX CHARGER, STAT INV, & SPCU MESSAGE.  ACCOMPLISHED FAULT RESET ALL FAULTS CLEARED NO OTHER ACTIONS NOTED.  A/C OK FOR SERVICE.

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