# SDR ASAA2017112522677

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 25, 2017
- Submitted: November 27, 2017
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 41,560 hours, 12,357 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Detector
- Condition: Malfunctioned
- Location: Fwd Cargo
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017112522677

## Discrepancy

FWD CARGO FIRE DETECTOR LOOP B WILL NOT TEST.  ACFT GROUNDED.  AFTER PERFORMING CARGO BAY SMOKE DETECTOR OPS TEST IAW AMM 26-16-00-710-801 AND CEU INSTALLATION TEST IAW AMM 26-16-02-710-801, BEING UNSUCCESSFUL IN DUPLICATING THE FAULT, AND HAVING NO HISTORY OF FAILING, DETERMINED THAT FWD CARGO FIRE DETECTOR LOOP B HAD AN INTERMITTENT FAULT.  MOVED FWD CARGO FIRE DETECTOR SELECTOR BACK TO NORMAL POSITION.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.