# SDR ABXA20260502184

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 2, 2026
- Submitted: May 4, 2026
- Operation: Air carrier
- Aircraft: [N744AX](https://openairdocs.org/aircraft/N744AX), registered now
- Make and model: Boeing 767232
- Aircraft serial: 22221
- Aircraft time: 105,159 hours, 47,004 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Circuit Card
- Part number: 644501
- Part serial: 1059
- Condition: Defective
- Location: Zone 400
- Part time: 9,960 hours, 3,453 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ABXA20260502184

## Discrepancy

L ENG FIRE LP1 STATUS MSG. MEASURED RESISTANCE FROM M681 FIRE LOOP 1 DETECT CARD THROUGH PINS 19 AND 20  1.5K OHMS RESISTANCE CHECK GOOD IAW B767 SSM 26-11-01 REMOVED AND REPLACED M681 FIRE DETECT CARD IAW B767 AMM 26-11-01 OPS CHECK GOOD CLEANED UPPER AND LOWER AFT FIRE DETECT ELEMENTS IAW AMM 26-11-02 AIRCRAFT NO ETOPS. A/C RETURNED TO SERVICE.

---
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.