# SDR ASAA2016070317229

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 3, 2016
- Submitted: July 5, 2016
- Operation: Air carrier
- Aircraft: [N479AS](https://openairdocs.org/aircraft/N479AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60576
- Aircraft time: 3,975 hours, 1,295 cycles
- System (JASC): [3000 · Ice/Rain Protection System](https://openairdocs.org/jasc/3000)
- Part: Anti-Ice Valve
- Condition: Malfunctioned
- Stage of operation: DE
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016070317229

## Discrepancy

INTERMITTENT DISPLAY ON FMC (3 TIMES IN DESCENT) TAI ON ABOVE 10DEG, TAI WAS NOT ON. NO INDICATION OF IT BEING ON - ENGINE IDLE LOW.  ACFT GROUNDED. IAW FIM 34-61 TASK 801, PERFORMED FMC DISCRETE SWITCH TEST, VERIFIED BOTH ENGINE ANTI-ICE SWITCHES DISCRETES OPS NORMAL.  CREW REPORTED ANTI-ICE VALVES OPERATED NORMAL NO FAULTS.

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