# SDR ASAA2020022863302

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 26, 2020
- Submitted: February 28, 2020
- Operation: Air carrier
- Aircraft: [N440AS](https://openairdocs.org/aircraft/N440AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41705
- Aircraft time: 25,184 hours, 8,109 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: 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/ASAA2020022863302

## Discrepancy

RT PACK LIGHT ON WITH RECALL. EXTINGUISHED WITH MASTER CAUTION RESET. GROUNDED - YES. PERFORMED PZTC BITE IAW B737-900 FIM 21-62 TASK 801 ON ZONE TEMP CONTROLLER 2. PREV FLT SHOWS THIS PACK TCV FAULT. NO CURRENT FAULTS. RAN R/H PACK AT VARYING TEMPS FOR 10 MINUTES, NO LIGHTS ILLUMINATED, NO LIGHTS ON RECALL. PZTC BITE PASSES WITH NO RED LIGHTS.

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