# SDR ASAA2019031428609

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 14, 2019
- Submitted: March 15, 2019
- Operation: Air carrier
- Aircraft: [N423AS](https://openairdocs.org/aircraft/N423AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 35206
- Aircraft time: 23,236 hours, 7,635 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: NR
- 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/ASAA2019031428609

## Discrepancy

LEFT "PACK" LIGHT ILLUMINATES WHEN MASTER CAUTION RECALL PUSHED. EXTINGUISHES WHEN SYSTEM IS RESET. GROUNDED - YES. REF FIM TASK 21-53 TASK 809, NR 1 PZTC LOGGED RAM AIR ACTUATOR FAULT, RESET FAULT. GVI LEFT RAM AIR DUCT, NO OBSTRUCTIONS NOTED. NR 1 AND NR 2 PZTC BITE TESTED GOOD WITHOUT FAULTS. LEFT PACK OPS CHECKED NORMAL ON GND W/O DEFECTS.

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