# SDR SWAA111901

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 16, 2011
- Submitted: March 18, 2011
- Operation: Air carrier
- Aircraft: [N901WN](https://openairdocs.org/aircraft/N901WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 32545
- Aircraft time: 11,777 hours, 7,017 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Control Valve
- Part number: 32895625
- Part serial: 104925958
- Condition: Faulty
- Location: Bleed Air Sys
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B, G, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA111901

## Discrepancy

NR 2 ENGINE PNEUMATIC BLEED TRIP INDICATION, 10 MINUTES LATER NR 1 ENG PNEUMATIC BLEED TRIPPED, DID EMERGENCY DESCENT AND PAX O2 MASKS DROPPED PER QRH.  C/W PNEU BLEED SYS CONFIDENCE CHECKS PER SWA MT'S.  REMOVED AND REPLACED BOTH ENGINES PNEU BLEED PRECOOLER CONTROL VALVES, HIGH STG REGULATORS & HIGH STG VALVES PER MM.

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