# SDR QKPR06003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 29, 2006
- Submitted: December 19, 2006
- Operation: General aviation
- Filed by: [Piedmont Aviation Component Services, LLC, repair station QKPR504X](https://openairdocs.org/faa-repair-station/QKPR504X/piedmont-aviation-component-services-llc.md) (OpenAirDocs)
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Fcu
- Part number: 38828406
- Part serial: A567C
- Condition: Leaking
- Location: Engine
- Component: Apu, Honeywell, GTCP36150RR
- Component part number: 38005141112
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QKPR06003

## Discrepancy

FUEL PRESSURE IN THE DIFFERENTIAL PRESSURE VALVE IS CAUSING SEVERE PITTING INSIDE THE FCU HOUSING.  THIS PITTING EVENTUALLY BECOMES A PIN HOLE IN THE HOUSING.  THIS PIN HOLE ALLOWS A STREAM OF FUEL, AT IDLE AND WHEN PRESSURE IS APPLIED, TO EXIT THE FCU.  POTENTIALLY, IF THIS PROBLEM IS NOT CORRECTED, IT COULD CREATE A FIRE HAZZARD.    ORIGINAL DIFFICULTY DATE 6/29/01.

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