# SDR ASAA2017110322417

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 3, 2017
- Submitted: November 6, 2017
- Operation: Air carrier
- Aircraft: [N407AS](https://openairdocs.org/aircraft/N407AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41731
- Aircraft time: 19,701 hours, 6,383 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 24600
- Condition: Failed
- Location: Lt A/C Pack
- Part time: 7,866 hours, 2,638 cycles
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017110322417

## Discrepancy

WHILE PERFORMING PACK TEMPERATURE CONTROL BITE TESTS,  FOUND THE LEFT PACK TCV FAULT LOGGED.  ACFT GROUNDED. REMOVED AND REPLACED LEFT PACK TEMPERATURE CONTROL VALVE IAW  AMM 21-51-10-000-801. PERFORMED BITE TEST IAW AMM 21-61-00-700-806-002. TEST PASSED,  LEAK CHECKED GOOD.

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