# SDR UPS03240955

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 8, 2003
- Submitted: July 9, 2003
- Operation: Air carrier
- Aircraft: N941UP
- Make and model: Boeing 727-22C
- Registry model: [Boeing 727-22C](https://openairdocs.org/model/boeing-727-22c) (OpenAirDocs)
- Aircraft serial: 19196
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Check Valve
- Condition: Leaking
- Location: Hyd System
- Stage of operation: CL
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS03240955

## Discrepancy

INSPECTION TYPE: N/A SMOKE IN COCKPIT - ATB.   A/C LANDED WITHOUT INCIDENT. T/S IN PROGRESS.  REMOVED AND REPLACED THE A SYS AIR PRESSURE REGULATOR IAW MM 2912. FOUND EVIDENCE OF HYD FLUID IN THE RES AIR PRESS CHECK VALVE ASSY.  REMOVED AND REPLACED ALL 3 CHECK VALVES PERFORMED LK CHECK AND RAN ALL 3 ENGINES APPROX 10 MINS 2 PACKS ON NO DEFECTS FOUND.

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