# SDR ASAA2017080521531

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 5, 2017
- Submitted: August 9, 2017
- Operation: Air carrier
- Aircraft: [N457AS](https://openairdocs.org/aircraft/N457AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36355
- Aircraft time: 14,031 hours, 4,647 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 1495
- Condition: Failed
- Location: Rt A/C Pack
- Part time: 79,284 hours, 42,086 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/ASAA2017080521531

## Discrepancy

RIGHT PACK LIGHT ILLUMINATED DURING DESCENT,  MASTER CAUTION RESET.  LIGHT EXTINGUISHED.  ACFT GROUNDED.  REMOVED AND REPLACED RIGHT PACK TCV IAW AMM 21-51-10-000-801, AND AMM 21-51-10-400-801 UP TO PAR 3 E. (2).  RIGHT PACK BITES GOOD.  PERFORMED LEAK CHECK OF THE RT TEMP CONTROL VALVE, LEAK CHECKED GOOD IAW AMM 21-51-10. VERIFIED RIGGING AND OPS TEST OF RT RAM AIR INLET ACTUATOR, NO DEFECTS NOTED IAW AMM 21-51-21.

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