# SDR AALA20120112STL01

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 11, 2012
- Submitted: January 16, 2012
- Operation: Air carrier
- Aircraft: N699AN
- Make and model: Boeing 757223
- Aircraft serial: 27051
- Aircraft time: 53,400 hours, 18,314 cycles
- System (JASC): [2915 · Hydraulic Pressure Relief Valve, Main](https://openairdocs.org/jasc/2915)
- Part: Shutoff Valve
- Condition: Leaking
- Location: Hydraulic Sys
- Stage of operation: CR
- How discovered: O
- Nature of condition: K
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20120112STL01

## Discrepancy

STL - CREW REPORTED LOSS OF RIGHT HYDRAULIC SYSTEM AND PRESSURE.  EMERGENCY DECLARED FLIGHT LANDED STL WITHOUT INCIDENT.  AIRCRAFT REMOVED FROM SERVICE.  FOUND DELTA P INDICATOR AT RIGHT HYDRAULIC SYSTEM PRESSURE MODULE BLOWN OUT CAUSING HYDRAULIC FAILURE.  REPLACED VALVE.  SYSTEM GROUND CHECK NORMAL OPERATION.

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