# SDR ASAA2020012161894

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 16, 2020
- Submitted: January 22, 2020
- Operation: Air carrier
- Aircraft: [N588AS](https://openairdocs.org/aircraft/N588AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35685
- Aircraft time: 46,331 hours, 13,881 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning Light
- Condition: False Activation
- Location: Rt A/C Pack
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020012161894

## Discrepancy

PACK LIGHT ON MASTER CAUTION RECALL. GROUNDED - YES.  FIM 21-53 TASK 821, BOTH PZTC'S HAVE NO PREVIOUS FLT FAULTS LOGGED. OPS CHECKED RIGHT PACK WITH NR 2 ENG BLEED, UNABLE TO DUPLICATE FAULT. VERIFIED RIGHT PACK OPS CHECKED NORMAL ON GND WITH ENGINE AND APU BLEED SOURCES. BOTH PTZC BITE VERIFY TEST NORMAL WITHOUT FAULTS.

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