# SDR ASAA2018032824058

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 28, 2018
- Submitted: March 29, 2018
- Operation: Air carrier
- Aircraft: [N590AS](https://openairdocs.org/aircraft/N590AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35687
- Aircraft time: 39,096 hours, 11,827 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning Message
- Condition: False Activation
- Location: Rt A/C Pack
- Stage of operation: NR
- How discovered: 9
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018032824058

## Discrepancy

RIGHT PACK LIGHT ILLUMINATED ON RECALL,  EXTINGUISHED ON RESET.  ACFT GROUNDED.  INDICATED RT PACK LIGHT BUT LT PACK CONTROLLER WAS DEFERRED. PERFORMED PACK/ZONE TEMPERATURE CONTROLLER BITE TEST ON BOTH THE LT & RT CONTROLLERS IAW AMM 21-61-00-700-806-002.  NR 1 LT ZONE TEMP CONTROLLER SHOWS RED FAULT RAM AIR ACTUATOR ON BITE & PREVIOUS FLIGHT TEST.  CLEARED AND GREEN.  SUBSEQUENT TEST SHOWS FAULT CLEARED & INTERMITTENT IAW FIM 21-62 TASK 837.

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