# SDR ASAA2021122937050

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 29, 2021
- Submitted: January 4, 2022
- Operation: Air carrier
- Aircraft: [N924AK](https://openairdocs.org/aircraft/N924AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43333
- Aircraft time: 613 hours, 151 cycles
- System (JASC): [3010 · Airfoil Anti/De-ice System](https://openairdocs.org/jasc/3010)
- Part: Valve
- Part number: 632160683
- Part serial: 6321606810486
- Condition: Stuck
- Location: Left Wing
- Part time: 607 hours, 150 cycles
- Stage of operation: DE
- 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/ASAA2021122937050

## Discrepancy

ON ARRIVAL INTO SEA 15000' WING ANTI ICE WAS SWITCHED ON L VALVE CAUTION LIGHT INDICATED VALVE WAS STUCK CLOSED. GROUNDED - YES. VERIFIED VALVE NOT OPENING, REMOVED & REPLACED L/H WING A/I VALVE REFB737-9 AMM 30-11-11 OPS & LK CK GOOD.

---
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.