# SDR ASAA2020032332490

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 18, 2020
- Submitted: March 24, 2020
- Operation: Air carrier
- Aircraft: [N564AS](https://openairdocs.org/aircraft/N564AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35103
- Aircraft time: 51,181 hours, 15,378 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: DE
- How discovered: O
- Nature of condition: N
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020032332490

## Discrepancy

LEFT PACK ILLUMINATED DURING "MASTER CAUTION RECALL" DURING DESCENT CHECK. GROUNDED - YES. REF B737-800 FIM 21-53 TASK 807, #1 PZTC PREV FLT BITE LOGGED "RAM ACT" FAULT. BITE VERIFY TESTED GOOD W/O FAULT. GVI, NO OBSTRUCTIONS IN RAM AIR INLET DUCT. VERIFIED LEFT PACK OPS CHECKED NORMAL ON GND W/O FAULT LIGHTS.

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