# SDR 2024FA0000939

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 25, 2024
- Submitted: December 5, 2024
- Operation: General aviation
- Aircraft: [N555GT](https://openairdocs.org/aircraft/N555GT), registered now
- Make and model: Piper PA-31-350
- Registry model: [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Aircraft serial: 317952148
- Aircraft time: 10,600 hours
- Engine: Lyc LTIO540J2B
- Engine time: 411 hours
- System (JASC): [8560 · Reciprocating Engine Supercharger](https://openairdocs.org/jasc/8560)
- Part: Wastegate Valve
- Part number: LW1684085
- Part serial: HYK000122
- Condition: Perforated
- Location: Zone 400
- Part time: 411 hours
- Stage of operation: CL
- How discovered: C
- Nature of condition: R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2024FA0000939

## Discrepancy

DENSITY CONTROLLER FAILED.  RESULTED IN ROLLBACK OF ENGINE POWER TO ~30" MANIFOLD PRESSURE.  LOSS OF TURBO BOOST.  SUSPECTED PART WAS RETURNED TO LYCOMING FOR TESTING AND FOUND TO BE DEFECTIVE.

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