# SDR ASAA2017110922511

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 9, 2017
- Submitted: November 13, 2017
- Operation: Air carrier
- Aircraft: [N487AS](https://openairdocs.org/aircraft/N487AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44108
- Aircraft time: 8,221 hours, 2,676 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989085
- Part serial: 25090
- Condition: Faulted
- Location: Lt A/C Pack
- Part time: 8,237 hours, 2,685 cycles
- Stage of operation: TX
- 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/ASAA2017110922511

## Discrepancy

ON TAXI AFTER MASTER CAUTION RECALL RECEIVED A ZONE TEMP LIGHT ON THE CONT CABIN CONTROLLER.  ACFT GROUNDED.   NR 1 & 2 PACK/ZONE TEMP CONTROLLER BITE SHOWS HARD FAIL FLIGHT DECK TCV (V143).  REMOVED & REPLACED TCV IAW AMM 21-61-21, GROUND FUNCTIONAL CK & LEAK CHECKED NORMAL IAW AMM 21-61-00-700-806-002.

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