# SDR F3LA2009080300124

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 31, 2009
- Submitted: August 3, 2009
- Operation: Air carrier
- Aircraft: N935FR
- Make and model: Airbus A319-111
- Registry model: [Airbus A319-111](https://openairdocs.org/model/airbus-a319-111) (OpenAirDocs)
- Aircraft serial: 2318
- Aircraft time: 17,387 hours, 8,587 cycles
- System (JASC): [2213 · Flight Controller](https://openairdocs.org/jasc/2213)
- Part: Control Unit
- Part number: C12850AC02
- Part serial: C12850004248
- Condition: Defective
- Location: Zone 200
- Stage of operation: CR
- How discovered: O
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/F3LA2009080300124

## Discrepancy

CREW MADE AN AIR RETURN, DUE TO THE ALTITUDE SELECTOR KNOB ON THE FLIGHT CONTROL UNIT BEING STUCK ON AN ALTITUDE, RENDERING THE AUTO-PILOT, AUTO-THRUST AND FLIGHT DIRECTORS TO AN UNAVAILABLE STATE. MX REMOVED AND REPLACED THE FLIGHT CONTROL UNIT AND PERFORMED OPS TEST, BITE TEST AND CAT III LAND TEST IAW AMM 22-81-12 PB401, 22-96-00-710-001 AND 22-97-00-710-001.

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