# SDR CALA2013112593239

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 21, 2013
- Submitted: December 19, 2013
- Operation: Air carrier
- Aircraft: [N477UA](https://openairdocs.org/aircraft/N477UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 1514
- Aircraft time: 40,678 hours, 17,558 cycles
- Engine: Iae V2527A5
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Loop
- Part number: 455001
- Condition: Warning Message
- Location: Apu Bay
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2013112593239

## Discrepancy

APU FIRE LOOP 'B' FAULT.  RAN APU FIRE LOOP SELF TEST, NO FAULTS NOTED. DUE TO PREVIOUS HISTORY REPLACEMENT OF APU FIRE LOOP B REQUIRED REPLACED 'B' LOOP PER AMM, OPS CHECKED OKAY.

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