# SDR ASAA20181126956

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 19, 2018
- Submitted: November 27, 2018
- Operation: Air carrier
- Aircraft: [N403AS](https://openairdocs.org/aircraft/N403AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41730
- Aircraft time: 24,119 hours, 7,943 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 20980
- Condition: Failed
- Location: Rt A/C Pack
- Part time: 15,898 hours, 5,885 cycles
- Stage of operation: DE
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA20181126956

## Discrepancy

PRIOR TO DESCENT MASTER CAUTION AIR COND R PACK LIGHT EXTINGUISHED CHECK LIGHT NO FURTHER ACTION. GROUNDED - YES. CONFIRMED FAULT R/H PACK/ZONE TEMP CONTROLLER BITE SHOWS HARD FAIL FLIGHT DECK TCV (V143) & INTERMITTENT R/H RAM AIR INLET ACTUATOR FAULT. REMOVED & REPLACED FLIGHT DECK TCV & R/H RAM AIR INLET ACTUATOR REF B737-900 AMM 21-61-21 & AMM 21-51-21, LK CK & OPS CK NML REF AMM 21-61-00-700-806-002.

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