# SDR ASAA2018021523575

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 15, 2018
- Submitted: February 21, 2018
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 39,444 hours, 12,032 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989085
- Part serial: 26395
- Condition: Faulted
- Location: Rt A/C Pack
- Part time: 6,200 hours, 1,858 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/ASAA2018021523575

## Discrepancy

RIGHT PACK LIGHT ILLUMINATED ON RECALL.  ACFT GROUNDED. VERIFIED THAT LIGHT WOULD NOT RESET WITH MASTER CAUTION RECALL THE LIGHT RESET.  TRIED PACK RESET,  NO HELP.  DURING RT P/Z TEMP CONTROL TEST TCV THIS PACK FAULTED.  FAULT WOULD NOT INITIALLY RESET.  RESET AND RETESTED TWICE LIGHT REMAINED OUT. RAN THE RT PACK AND FWD & AFT ZONE SUPPLY TEMPS WOULD NOT CHANGE,  SELECTORS POSITIONED WARM AND COLDER .  REMOVED AND REPLACED THE RT PACK TCV AND P/Z TEMP CONTROLLER. SYS CHECKED OK IAW AMM 21-51-10, PB 400, AND 21-61-20, PB 400.  BITE TESTED OK, AND PACKS OPS CHECKED OK. TEMPS CONTROLLABLE EACH ZONE.

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