# SDR ASAA2017042920553

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 29, 2017
- Submitted: May 1, 2017
- Operation: Air carrier
- Aircraft: [N478AS](https://openairdocs.org/aircraft/N478AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44105
- Aircraft time: 7,223 hours, 2,415 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Controller
- Part number: 510901601
- Part serial: 5109016001945
- Condition: Failed
- Location: Ram Air Exhaust
- Part time: 7,222 hours, 2,414 cycles
- Stage of operation: CR
- 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/ASAA2017042920553

## Discrepancy

DURING CRUISE AT FL 400,  RECALL PUSHED AND LT PACK LIGHT ILLUMINATED WITH MASTER CAUTION AIR CONDITIONING,  ALL TEMPS AND PRESSURES NORMAL. ACFT GROUNDED.  REMOVED & REPLACED THE NR 1 TEMP CONTROLLER. OPS CHECKED GOOD IAW AMM 21-61-20.  REMOVED & REPLACED THE LT RAM AIR EXHAUST ACTUATOR IAW AMM 21-51-27-000-801, & 21-51-27-400-801. OPS CHECKED GOOD.

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