# SDR ASAA2019071930112

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 19, 2019
- Submitted: July 30, 2019
- Operation: Air carrier
- Aircraft: [N587AS](https://openairdocs.org/aircraft/N587AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35684
- Aircraft time: 45,201 hours, 13,157 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Terminal
- Condition: Broken
- Location: Fire Warning
- Stage of operation: TX
- 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/ASAA2019071930112

## Discrepancy

#1 FIRE SWITCH DOES NOT TEST. GROUNDED - YES. VERIFIED DISCREPANCY. RESISTANCE AT D1002 PIN 24 TO 25 READING 3.7K OHMS SHOULD READ <3 OHMS. AT PINS 25 TO 2 READING 2.35K OHMS. SHOULD READ 862 OHMS. INSPECTED AND FOUND BROKEN TERMINAL AT M1758. AFTER NEW TERMINAL INSTALL READINGS WERE PINS 24 TO 25 1.9 OHMS. PINS 25 TO 2 READINGS WAS 859 OHMS. PERFORMED FIRE DETECTION OPS TEST REF AMM 26-11-00/501. SYS CHKS NML.

---
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.