# SDR ASAA2026040465308

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 4, 2026
- Submitted: April 6, 2026
- Operation: Air carrier
- Aircraft: [N472AS](https://openairdocs.org/aircraft/N472AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60580
- Aircraft time: 41,134 hours, 12,596 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Test Switch
- Condition: Dirty
- Location: Zone 100
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2026040465308

## Discrepancy

WHEEL WELL FIRE TEST FAILED SWITCH IN WHELL WELL DOES NOT EXTINGUISH LIGHT OR BELL. GROUNDED - YES. TRANSFERED TO MIG-5 S/N OK464651 CLEANED WHEEL WELL FIRE TEST SWITCH OPS CHECK GOOD IAW B737-900 AMM 26-15-00-710-801 AND 20-60-02-100-801.

---
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.