# SDR ASAA2021072635531

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 26, 2021
- Submitted: July 28, 2021
- Operation: Air carrier
- Aircraft: [N592AS](https://openairdocs.org/aircraft/N592AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35190
- Aircraft time: 49,009 hours, 14,597 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989083
- Part serial: 9899
- Condition: Faulty
- Location: Left Ecs Bay
- Part time: 45,129 hours, 14,630 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/ASAA2021072635531

## Discrepancy

LEFT PACK LIGHT ILLUMINATES ON RECALL RESET EXTINGUISHES LIGHT. GROUNDED - YES. PERFORMED PACK TEMP CONTROL BITE TEST PER B737-800 FIM 21-62 TASK 801. ISOLATED FAULT, LEADING TO REMOVAL & REPLACEMENT OF (LEFT) TCV 139 IAW FIM TASK 21-62 & B737-800 AMM 21-51-10. OPS CK & LEAK CK GOOD.

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