# SDR P5CA2016030100062

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 29, 2016
- Submitted: March 3, 2016
- Operation: Air carrier
- Aircraft: [N857GT](https://openairdocs.org/aircraft/N857GT), registered now
- Make and model: Boeing 747-87UF
- Registry model: [Boeing 747-87UF](https://openairdocs.org/model/boeing-747-87uf) (OpenAirDocs)
- Aircraft serial: 37568
- Aircraft time: 17,685 hours, 3,042 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Pneumatic System
- Condition: Malfunctioned
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P5CA2016030100062

## Discrepancy

STARTER CUTOUT EICAS MESSAGE 1.5 HRS AFTER TAKEOFF.  ON RETURN TO DEPARTURE  MESSAGE WENT AWAY BUT GOT BLEED 4.  CYCLING ON/OFF WITH 10-15 PSI DUCT PRESSURES ON ISOLATED SIDE.  FOUND ENGINE 4 PRSOV PARTLY OPEN ON ENGINE SHUTDOWN CAUSING BACK PRESSURE AND STARTER CUT OUT MESSAGE.  PRSOV DEACTIVATED ACCORDING TO MEL 36-11-01.

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