# SDR SFOA201607220001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 18, 2016
- Submitted: July 22, 2016
- Operation: Air carrier
- Aircraft: [N87SF](https://openairdocs.org/aircraft/N87SF), registered now
- Make and model: Cessna 650
- Registry model: [Cessna 650](https://openairdocs.org/model/cessna-650) (OpenAirDocs)
- Aircraft serial: 6507089
- Aircraft time: 7,192 hours, 5,807 cycles
- System (JASC): [3418 · Stall Warning System](https://openairdocs.org/jasc/3418)
- Part: Computer
- Part number: SLZ7715
- Part serial: AC1212A
- Condition: Failed
- Location: Stall Warning
- Stage of operation: CR
- How discovered: O
- Nature of condition: G
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SFOA201607220001

## Discrepancy

AT CRUISE FLIGHT MULTIPLE AMBER ANNUNCIATIONS ILLUMINATED, AOA PROBE, FLAP SPEEDBRAKE AND STALL WARNING, OFF FLAGS ALSO CAME INTO VIEW ON THE AOA INDICATOR AND BOTH FAST/SLOW INDICATORS.  CREW FOLLOWED AFM PROCEDURES AND A SAFE LANDING WAS MADE AT DESTINATION AIRPORT.  INVESTIGATION REVEALED THAT THE ANGLE OF ATTACK COMPUTER HAD FAILED. THE COMPUTER WAS REPLACED WITH AN O/H UNIT AND ALL SYSTEM CHECKS WERE NORMAL.  TIME 13 YEARS AND 2936 HRS SINCE LAST INSTALLATION AND FATIGUE ARE SUSPECTED CAUSES OF FAILURE.

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