# SDR BIER960034

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 23, 1996
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N27508
- Make and model: Piper PA-31-350
- Registry model: [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Aircraft serial: 317852031
- Engine: Lyc LTIO540J2BD
- System (JASC): [6120 · Propeller Controlling System](https://openairdocs.org/jasc/6120)
- Part: Diff Pres Cntrl
- Part number: LW1009885
- Condition: Inoperative
- Location: Rt Engine
- Part time: 348 hours
- Stage of operation: CR
- Nature of condition: R
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/BIER960034

## Discrepancy

MANIFOLD PRESSURE FOLLOWED PROPELLER PITCH ADJUSTMENT, MAXIMUM PRESSURE OK ON TAKEOFF, BUT DID NOT MAINTAIN CONSTANT MP IN-FLIGHT.  FOUND DIFFERENTIAL PRESSURE CONTROLLER TO BE INOPERATIVE.

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