# SDR ASAA2018032123997

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 21, 2018
- Submitted: March 22, 2018
- Operation: Air carrier
- Aircraft: [N530AS](https://openairdocs.org/aircraft/N530AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 36578
- Aircraft time: 30,991 hours, 9,222 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989083
- Part serial: 5670
- Condition: Failed
- Location: Nr 2 Pack
- Part time: 59,919 hours, 19,844 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018032123997

## Discrepancy

CONTROL CABIN ZONE TEMP LIGHT ILLUMINATES DURING RECALL. THE ZONE TEMP LIGHT EXTINGUISHED ON MASTER CAUTION RESET.  ACFT GROUNDED. CONFIRMED FAULT,  THE NR 2 PACK/ZONE TEMP CONTROLLER BITE IAW AMM 21-61-00-700-806-002,  SHOWS HARD FAIL FLIGHT DECK TCV V143.   REPLACED THE TCV AMM 21-61-21, OPS CHECKED NORMAL. NR 1 PACK/ZONE TEMP CONTROLLER SHOWS NO FAULTS.

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