# SDR SWAA2018082024288

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 16, 2018
- Submitted: August 21, 2018
- Operation: Air carrier
- Aircraft: [N224WN](https://openairdocs.org/aircraft/N224WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 32493
- Aircraft time: 45,102 hours, 26,660 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Control Valve
- Part number: 332895625
- Part serial: 6800
- Condition: Stuck
- Location: Bleed Air Sys
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2018082024288

## Discrepancy

DIVERSION, JUST PRIOR TO LEVEL OFF LEFT "PACK TRIP OFF" ILLUMINATED. STARTED EMERGENCY DECENT. CABIN ALTITUDE WARNING HORN SOUNDED.  FOUND PRECOOLER CONTROL VALVE STUCK CLOSED. R&R RIGHT ENGINE PRECOOLER CONTROL VALVE PER AMM.

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