# SDR ASAA2016071917424

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 19, 2016
- Submitted: July 21, 2016
- Operation: Air carrier
- Aircraft: [N581AS](https://openairdocs.org/aircraft/N581AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35188
- Aircraft time: 35,314 hours, 10,687 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Condition: Faulted
- Location: Nr 1
- Stage of operation: TX
- 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/ASAA2016071917424

## Discrepancy

LEFT PACK LIGHT ILLUMINATED ON RECALL, DURING AFTER START CHECKLIST, RESET MASTER CAUTION AND PACK LIGHT EXTINGUISHED.  ACFT GROUNDED. FIM TASK 801, 21-61, PZTC NR 1 SHOWED TCV FAULT, UNABLE TO VERIFY FAULT. RESET AND LEFT PACK LIGHT NO LONGER ILLUMINATES.

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