# SDR ASAA2015121114209

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 11, 2015
- Submitted: December 14, 2015
- Operation: Air carrier
- Aircraft: [N491AS](https://openairdocs.org/aircraft/N491AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44109
- Aircraft time: 58 hours, 25 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Module
- Part number: 90195002
- Part serial: 8025
- Condition: Failed
- Location: Fire Detection
- Part time: 82 hours, 32 cycles
- Stage of operation: CL
- 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/ASAA2015121114209

## Discrepancy

APU DETECTOR INOPERATIVE LIGHT, ALONG WITH OVERHEAT/DETECTOR MASTER CAUTION LIGHT FLASHES CONTINUOUSLY AFTER REACHING TOP OF CLIMB.  ACFT GROUNDED.  DVI ON C403 C/B, NO DEFECTS NOTED.  DUE TO C/B FOUND OUT.  R & R M279 ENGINE/APU OVERHEAT DETECTION MODULE REF AMM 26-10-01. GVI APU FIRE DETECTOR LOOP, FOUND WIRE W7538-6001R-18 AT UPPER DETECTOR LOOSE ENOUGH THAT WIRE LUG CAN SLIDE ON DETECTOR STUD, CONNECTOR SECURED REF WDM 26-11-31. ENGINE AND APU FIRE TEST NORMAL.

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