# SDR ASAA2021112536715

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 25, 2021
- Submitted: November 30, 2021
- Operation: Air carrier
- Aircraft: [N487AS](https://openairdocs.org/aircraft/N487AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44108
- Aircraft time: 22,490 hours, 7,000 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 6835
- Condition: Unknown
- Location: Right Ecs Bay
- Part time: 62,064 hours, 22,335 cycles
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021112536715

## Discrepancy

ON RECALL RT PACK LIGHT ILLUMINATES. EXTINGUISHES ON MC RESET. GROUNDED - YES. REMOVED AND REPLACED RH PACK TEMP CONTROL VALVE AS REQUIRED OPS CKD GOOD, LEAK CKD GOOD NO LEAKS NOTED. PERFORMED PACK/ZONE TEMP CONTROLLER TEST NO FAULTS FOUND REF B737-900 AMM 21-51-10-400-801.

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