# SDR AALA2019060319026

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 30, 2019
- Submitted: June 3, 2019
- Operation: Air carrier
- Aircraft: N938UW
- Make and model: Boeing 757-2B7
- Registry model: [Boeing 757-2B7](https://openairdocs.org/model/boeing-757-2b7) (OpenAirDocs)
- Aircraft serial: 27246
- Aircraft time: 78,071 hours, 27,726 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Control Valve
- Part number: 32896265
- Part serial: 0605
- Condition: Failed
- Location: Lt Bleed Sys
- Part time: 66,057 hours, 22,615 cycles
- 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/AALA2019060319026

## Discrepancy

AIRCRAFT WAS GROUNDED: PILOT DECLARED EMERGENCY ON ACCOUNT OF PRESSURIZATION ISSUE. LEFT ENGINE BLEED FAILURE AFTER RH BLEED ON MEL. MAINTENANCE REPLACED FAN AIR VALVE IAW AMM 36-11-16-404-096-001. OPS AND LEAK CHECK GOOD.

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