# SDR ASAA2017042320517

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 23, 2017
- Submitted: April 25, 2017
- Operation: Air carrier
- Aircraft: [N478AS](https://openairdocs.org/aircraft/N478AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44105
- Aircraft time: 7,193 hours, 2,400 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Actuator
- Part number: 676000141
- Part serial: 676000143198
- Condition: Failed
- Location: Lt A/C Pack
- Part time: 7,205 hours, 2,405 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017042320517

## Discrepancy

PACK LIGHT ILLUMINATED, EXTINGUISHES ON RESET.  ACFT GROUNDED.  PERFORMED LEFT PZTC BITE IAW AMM TASK 21-61-00.  FOUND LEFT INLET ACTUATOR FAILED.  REPLACED LEFT INLET ACTUATOR AND RAM AIR CONTROL TEMP SENSOR. PZTC BITE TESTED GOOD. LT PACK CONTROL OPS NORMAL.

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