# SDR CALA2013111492931

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 13, 2013
- Submitted: December 30, 2013
- Operation: Air carrier
- Aircraft: [N663UA](https://openairdocs.org/aircraft/N663UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 27160
- Aircraft time: 87,234 hours, 13,939 cycles
- Engine: Pwa PW4060
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Valve
- Condition: Malfunctioned
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2013111492931

## Discrepancy

LT & RT DUCT PRESSURE SPLIT DURING CRUISE, WITH ENGINES RUNNING.  LT & RT ISOLATION VALVES CLOSED & BLEED SWITCH ON.  LT PRESSURE 35 PSI & RT PRESSURE 20 PSI,  CRUISE FL 370 LEPR 1.17 REPAIR 1.22.     PERFORMED AIR SUPPLY DISTRIBUTION SYSTEM TEST PER AMM 36-11-00-501. BLEED PRESSURES AND BLEED SHIFT POINTS NORMAL. SYSTEM TEST ACCOMPLISHED.

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