# SDR ASAA2020102333401

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 23, 2020
- Submitted: October 26, 2020
- Operation: Air carrier
- Aircraft: [N534AS](https://openairdocs.org/aircraft/N534AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35202
- Aircraft time: 37,297 hours, 10,754 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Actuator
- Part number: 5416744
- Part serial: 11901
- Condition: Inoperative
- Location: Ram Air Inlet
- Part time: 47,748 hours, 14,850 cycles
- Stage of operation: CL
- 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/ASAA2020102333401

## Discrepancy

LT PACK LIGHT ILLUMINATED ON CLIMB.  RESET W/MASTER CAUTION.  SUBSEQUENTLY ILLUMINATES ON RECALL, EXTINGUISHES WITH MASTER CAUTION.  GROUNDED-YES.   PERFORMED PACK TEMP CONTROL BITE, REF B737-800 FIM 21-62 TASK 801.  FOUND NR 1 ZONE TEMP CONTROLLER FAULT "RAM AIR ACT".  PERFORMED FIM 21-62 TASK 837 TO STEP F.  REMOVED AND REPLACED LEFT PACK RAM AIR INLET ACTUATOR, REF B737-800 AMM 21-51-21.  PERFORMED BITE TASK AMM 21-61-00.  SYSTEM OPERATIONS CHECK GOOD AND NO DEFECTS NOTED.

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