# SDR ASAA2022060138535

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 1, 2022
- Submitted: June 3, 2022
- Operation: Air carrier
- Aircraft: [N495AS](https://openairdocs.org/aircraft/N495AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41728
- Aircraft time: 23,088 hours, 7,225 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Shutoff Valve
- Part number: 633967542
- Part serial: 179
- Condition: Faulty
- Location: Left Ecs Bay
- Part time: 21,164 hours, 6,653 cycles
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022060138535

## Discrepancy

TROUBLESHOOTING PER B737-900 FIM 21-33 TASK 802 FOR CABIN RATE OF CLIMB FLUCTUATION REF LP# 60269168 REQUIRES REPLACEMENT OF L/H PACK FLOW CONTROL & SHUT OFF VLV. GROUNDED - YES. REMOVED & REPLACED L/H PACK FLOW CONTROL & SHUTOFF VLV REF B737-900 AMM 21-51-01. OPS & LK CHECKS GOOD AT THIS TIME REF AMM 21-51-00.

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