# SDR ASAA2015120714143

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2015
- Submitted: December 9, 2015
- Operation: Air carrier
- Aircraft: [N491AS](https://openairdocs.org/aircraft/N491AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44109
- Aircraft time: 26 hours, 13 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Loop
- Condition: False Activation
- Location: Apu Bay
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2015120714143

## Discrepancy

MASTER CAUTION, OVERHEAT, DETECTION LIGHT FLASHING INTERMITTENTLY WITH APU DET INOPERATIVE LIGHT.  ACFT GROUNDED.  APU FIRE DETECTION TEST NORMAL NUMEROUS TIMES, NO FAULT ON ENGINE & APU FIRE BOX.  ACCOMPLISHED APU LOOP RESISTANCE CHECKS REF AMM 26-15-00 WITHIN LIMITS.

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