# SDR CA130422011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 12, 2013
- Submitted: September 14, 2015
- Operation: General aviation
- Make and model: Piper PA-31-350
- Registry model: [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Aircraft time: 5,512 hours
- Engine: Lyc TIO540J2BD
- Propeller: Hartzl HCE3YR2A
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Controller
- Part number: 4708869002
- Condition: Faulty
- Stage of operation: TO
- How discovered: O
- Nature of condition: R, J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA130422011

## Discrepancy

(CAN) ON TAKEOFF, THE PILOT REPORTED THE ACFT VEERING VERY HARD TO 1 DIRECTION, THE TAKEOFF WAS ABORTED.  FURTHER INSPECTION REVEALED THAT THE RT ENGINE WAS ACCELERATING NORMAL UNTIL 30" MANIFOLD PRESSURE AND THEN DROPPING OFF POWER BACK TO IDLE.   MAINTENANCE DISCOVERED A FAULTY DIFF PRESSURE CONTROLLER,  THE ENGINE WAS CHOKING OUT BEING RUN TO RICH AS A RESULT OF THE WASTE GATE NOT CLOSING. THE CONTROLLER WAS REPLACED AND THE ACFT WAS FOUND SERVICEABLE.

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