# SDR ASAA2023010321338

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 29, 2022
- Submitted: January 3, 2023
- Operation: Air carrier
- Aircraft: [N937AK](https://openairdocs.org/aircraft/N937AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44100
- Aircraft time: 2,189 hours, 651 cycles
- System (JASC): [3010 · Airfoil Anti/De-ice System](https://openairdocs.org/jasc/3010)
- Part: Warning Light
- Condition: False Activation
- Location: Anti-Ice Valve
- Stage of operation: NR
- How discovered: 9
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023010321338

## Discrepancy

WING ANTI - ICE (L) VALVE STAYED ILLIUMINATED AFTER TURNING WING ANTI - ICE ON. CYCLED SWITCH AND VALVE REMAINED CLOSED AFTER SECOND ATTEMPT. ADDED POWER AS WELL AND L VALVE LIGHT REMAINED ILLUMINATED WITH WING ANTI - ICE SWITCH ON. GROUNDED - YES. C/W WING TAI LEFT VALVE HEALTH CHECK, AFTER CYCLING L WING TAI VALVE 3 TIMES = NO FAULTS FOUND. WING TAI OPS CHECKS OK. REF B737-9 AMM 30-11-11-200-801.

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