# SDR ASAA2013070395455

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 3, 2013
- Submitted: July 5, 2013
- Operation: Air carrier
- Aircraft: [N570AS](https://openairdocs.org/aircraft/N570AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35185
- Aircraft time: 24,503 hours, 7,301 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Diaphragm
- Condition: Failed
- Location: Shutoff Valve
- Component: Shutoff Valve
- Component part number: 32895625
- 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/ASAA2013070395455

## Discrepancy

DUCT PRESSURE SPLIT IN CLIMB EXCEDED 20 PSI -CLIMB/CRUISE. FL 350 N1-101.9, DUCT PRESS L- 28, R-47. FL 390 N1-99.6, DUCT PRESS  L-26, R-47. FL 400 N1-99.1, DUCT PRESS L-26, R-47. FL 400 N1-87.6, DUCT PRESS L-30, R-35.  ACFT GROUNDED.  PERFORMED T/C NG-36WC-00001 BLEED AIR SYS HEALTH CK ON NR 1 ENG PRECOOLER VALVE AND BLEED AIR REGULATOR FAILED.  R & R PRECOOLER VALVE IAW AMM 36-12-02.  R & R BLEED AIR REGULATOR IAW AMM 36-11-03. WHILE PERFORMING OPS & LEAK CHECKED,  FOUND PRSOV DIAPHRAM LEAKING.  R & R PRSOV IAW AMM 36-11-04 1. PERFORMED ENGINE RUN IAW AMM 36-10-00.  OPS CK GOOD NO DUCT SPLIT.

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