# SDR ASAA2019081293357

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 9, 2019
- Submitted: August 12, 2019
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 42,094 hours, 12,557 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning Light
- Condition: False Activation
- Location: Lt A/C Pack
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019081293357

## Discrepancy

LEFT PACK LITE ILLUMINATED DURING AFTER START RECALL, FOLLOWED QRH LITE WENT OUT ON MASTER CAUTION RESET. GROUNDED - YES. FOUND PZTC 1 TCV FAULT. PER B737-800 FIM 21-62 TASK 830 FAULT CLEARED ON VERIFY. RAN PACK WITH NO DEFECTS NOTED.

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