# SDR ASAA2017020519689

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 5, 2017
- Submitted: February 7, 2017
- Operation: Air carrier
- Aircraft: [N407AS](https://openairdocs.org/aircraft/N407AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41731
- Aircraft time: 16,759 hours, 5,386 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Controller
- Part number: 6228145
- Part serial: 62281407670
- Condition: Failed
- Location: Ee Bay
- Part time: 16,756 hours, 5,385 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017020519689

## Discrepancy

RIGHT PACK LIGHT ILLUMINATED. PERFORMED QRH WITH TRIP RESET,  PACK LIGHT REMAINED ON.  ACFT GROUNDED.  BITE OF RIGHT PACK/ZONE TEMP CONTROLLER (PZTC-2)  IAW FIM 21-62 TASK 801.  SHOWED NO FAULTS, BUT LEFT PACK/ZONE TEMP CONTROLLER (PZTC-1) SHOWED CONTROLLER FAULT - STANDBY PACK WHICH RESET WITH VERIFY TEST.  REMOVED, REPLACED, AND TESTED PZTC-1 IAW AMM 21-61-20-000-801 AND AMM 21-61-20-400-801.  OPS NORMAL.

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