# SDR ASAA2023041942929

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 19, 2023
- Submitted: April 20, 2023
- Operation: Air carrier
- Aircraft: [N921AK](https://openairdocs.org/aircraft/N921AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43337
- Aircraft time: 5,743 hours, 1,657 cycles
- System (JASC): [3000 · Ice/Rain Protection System](https://openairdocs.org/jasc/3000)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: NR
- 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/ASAA2023041942929

## Discrepancy

WING ANTI ICE "L VALVE" LIGHT ILLUMINATED WHEN THE WING ANTI ICE WAS TURNED ON. LIGHT TURNNED OFF WHEN WING ANTI ICE WAS TURNED OFF. GROUNDED - YES. PERFORMED LEFT WING THERMAL ANIT ICE VALVE HEALTH CHECK REF B737-9 AMM 30-11-11. OPS CHECK GOOD, AND INLET TUBE CLEAR. NO HISTORY 30 DAYS. A/C OK FOR SERVICE.

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