# SDR ASAA2019101431016

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 13, 2019
- Submitted: October 16, 2019
- Operation: Air carrier
- Aircraft: [N478AS](https://openairdocs.org/aircraft/N478AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44105
- Aircraft time: 16,936 hours, 5,531 cycles
- System (JASC): [3030 · Pitot/Static Anti-Ice System](https://openairdocs.org/jasc/3030)
- Part: Warning Light
- Condition: False Activation
- Location: Lt Alpha Vane
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019101431016

## Discrepancy

"L ALPHA VANE" LIGHT ILLUMINATED WITH SWITCH IN ON POSN. C/B CONFIRMED IN. NOTE- AFTER SHUTDOWN AND CYCLING SWITCH, LIGHT REMAINED EXTINGUISHED WITH SWITCH IN "ON" POSITION. GROUNDED - YES. C/W B737-900 FIM 30-31 TASK 804 GROUND VERIFICATION CHECKED GOOD.

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