# SDR ASAA2020122433744

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 24, 2020
- Submitted: December 29, 2020
- Operation: Air carrier
- Aircraft: [N462AS](https://openairdocs.org/aircraft/N462AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36361
- Aircraft time: 24,751 hours, 7,994 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3989085
- Part serial: 25499
- Condition: Inoperative
- Location: Lt A/C Pack
- Part time: 18,045 hours, 5,825 cycles
- Stage of operation: NR
- 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/ASAA2020122433744

## Discrepancy

ZONE TEMP (CONT CAB) ILLUMINATED ON RECALL.   EXTINGUISHES WITH MASTER CAUTION RESET.  GROUNDED-YES.  CONFIRMED FAULT, CONT CAB ZONE LIGHT ILLUMINATES ON RECALL.  NR 2 PACK/ZONE TEMP CONTROLLER SHOWS HARD FAIL FLIGHT DECK TCV (V143).  REMOVED & REPLACED TCV, REF B737-900 AMM 21-61-21.  LEAK CHECK & OPERATIONS CHECK NORMAL, REF AMM 21-61-00-700-806-002.

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