# SDR ASAA2015032211061

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 22, 2015
- Submitted: March 24, 2015
- Operation: Air carrier
- Aircraft: [N435AS](https://openairdocs.org/aircraft/N435AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43292
- Aircraft time: 5,443 hours, 1,802 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Valve
- Part number: 3989084
- Part serial: 20364
- Condition: Malfunctioned
- Location: Rt A/C Pack
- Part time: 5,443 hours, 1,802 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2015032211061

## Discrepancy

FWD SUPPLY DUCT INTERMITTENTLY, UNCONTROLLABLE TEMPERATURE VARIES FROM 16-60 DEGREE C.  F/A REPORTED TEMP FLUCTUATIONS IN CABIN.  ACFT GROUNDED.  RAN PACKS FOR 45 MINUTES, WAS ABLE TO VERIFY FWD SUPPLY DUCT TEMP FLUCTUATES.  BITE TEST BOTH CONTROLLERS NR 2 SHOWS "TCV" FAULT RT SIDE.  REF FIM 21-61, TASK 864, FIN 21-62 TASK 801.  FWD CABIN FROM ROW 15 FORWARD WAS NOTICEABLY HOTTER WHEN ABLE TO DUPLICATE HIGH END FAILURE.  REPLACED NR 2 PACK TEMP CONTROL VALVE, REF AMM 21-51-10, OPS AND LEAK CHECK GOOD.

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