# SDR J7SA201812275001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 25, 2018
- Submitted: January 15, 2019
- Operation: Air carrier
- Aircraft: N521FX
- Make and model: Bombdr BD1001A10
- Aircraft serial: 20057
- Aircraft time: 12,728 hours, 7,866 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Sensor
- Condition: Malfunctioned
- Location: Apu Bay
- Stage of operation: CL
- How discovered: O
- Nature of condition: N
- Precautionary procedure: E, F, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/J7SA201812275001

## Discrepancy

DIVERTED DUE TRIPLE CHIME WITH APU FIRE WARNING IN FLIGHT. FIRED NR 2 FIRE BOTTLE AND CAS CLEARED.  AIRCRAFT LANDED WITHOUT INCIDENT. R&R NR 2 FIRE BOTTLE. OPS CHECK OF FIRE DETECT AND EXTINGUISHING SYSTEM GOOD. INSPECTED APU FOR SIGNS OF FIRE. NO DEFECTS NOTED. INSTALLED 3 DISCARGE CARTRIDGES. R&R APU EDUCTOR SENSING ELEMENTS.

---
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.