# SDR CA190430007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 28, 2019
- Submitted: August 17, 2020
- Operation: General aviation
- Make and model: Aerosp ATR 42-300
- Registry model: [Aerosp ATR 42-300](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-300) (OpenAirDocs)
- Aircraft time: 42,550 hours
- Engine: Pwa PW120A
- Propeller: Hamstd 14SF5
- System (JASC): [2750 · Trailing Edge Flap Control System](https://openairdocs.org/jasc/2750)
- Part: Feedback Unit
- Part number: 70313
- Condition: Shorted
- Location: Te Flaps
- Stage of operation: LD
- How discovered: O
- Nature of condition: F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA190430007

## Discrepancy

(CAN) AFTER LANDING, THE FLIGHT CREW WAS UNABLE TO REPOSITION THE FLAPS FROM 30 DEGREES. ANY MOVEMENT OF THE FLAP HANDLE TO A DIFFERENT POSITION WOULD RESULT IN THE CIRCUIT BREAKER TRIPPING. IT WAS DISCOVERED THAT THE FLAP FEEDBACK UNIT HAD AN INTERNAL SHORT TO GROUND ON PIN `T`, CAUSING THE FLAP SYSTEM TO BECOME UNRESPONSIVE. THE UNIT WAS REPLACED AND NO FURTHER FAULTS WERE FOUND WITH THE FLAP SYSTEM.

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