# SDR ASAA2019081213356

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 11, 2019
- Submitted: August 12, 2019
- Operation: Air carrier
- Aircraft: [N419AS](https://openairdocs.org/aircraft/N419AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41734
- Aircraft time: 25,356 hours, 8,250 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3966081
- Part serial: 6518
- Condition: Failed
- Location: Rt A/C Pack
- Part time: 25,353 hours, 8,249 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019081213356

## Discrepancy

WHILE ACCOMPLISHING TROUBLESHOOTING FOR L/H PACK, DISCREET FOR R/H PACK SHOWED "ON" WHEN SHOULD HAVE SHOWN "OFF.". GROUNDED - YES. REMOVED & REPLACED FLOW CONTROL VALVE ON R/H PACK REF B737-900 AMM 21-51-01. OPS CHECK GOOD. ETOPS GROUND VERIFICATION PASSED.

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