# SDR AALA2020082439029

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2020
- Submitted: August 24, 2020
- Operation: Air carrier
- Aircraft: [N932AN](https://openairdocs.org/aircraft/N932AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29530
- Aircraft time: 58,687 hours, 24,647 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Valve
- Part number: 632921461
- Part serial: 65445
- Condition: Defective
- Location: Bleed System
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA2020082439029

## Discrepancy

AIRCRAFT WAS GROUNDED: WHEN LEVELING OFF AT FL3700 FROM CLIMB AT CONTINUOUS POWER, AS POWER THRUST IS RETARED CABIN  CLIMBS AT 500-1000 FPM - CABIN AUTO FAIL DID NOT ILLUMINATED - SUSPECT BLEED ISSUE LEFT DUCT  PSI ZERO PSI. REPLACED LEFT ENGINE PRECOOLER VALVE AND THE VALVE SENSOR AND ACCOMPLSHED A SATISFACTORY OPERATIONAL CHECK PER AMM 36-12-03.

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