# SDR ASAA12511568

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 15, 2012
- Submitted: May 30, 2012
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 21,507 hours, 6,527 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Valve
- Part number: 32895626
- Part serial: 10480
- Condition: Failed
- Location: Nr 1 Engine
- Part time: 16,738 hours, 5,225 cycles
- Stage of operation: CL
- 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/ASAA12511568

## Discrepancy

RUNNING A DUCT PRESSURE SPLIT DURING CLIMB AND CRUISE.  DURING CLIMB, DUCT SPLIT 25PSI LEFT, DUCT LOW 21PSI.  DURING CRUISE AT FL 360, RIGHT DUCT 44PSI, LEFT DUCT 21PSI.  ACFT GROUNDED.  COMPLETED T/C NG 36WC-0001 FOR ENGINE BLEED AIR HEALTH SYS CHECK. FOUND PCV STICKING, HSV STICKING AND PRSOV LEAKING.  REPLACED PCV REF AMM 36-12-02. CHECKED GOOD.  REPLACED HSV NR 1 REF AMM 36-11-06.  CHECKED GOOD.  REPLACED PRSOV REF AMM 36-11-04, CHECKED GOOD. BLEED AIR SYS HEALTH CHECKED GOOD.

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