# SDR ASAA2019010727705

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 7, 2019
- Submitted: January 10, 2019
- Operation: Air carrier
- Aircraft: [N535AS](https://openairdocs.org/aircraft/N535AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35200
- Aircraft time: 31,180 hours, 9,059 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Unknown
- Condition: Malfunctioned
- Location: Ac Bay
- Stage of operation: DE
- 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/ASAA2019010727705

## Discrepancy

LEFT PACK LT CAME ON AT T/D DESCENT CHECK. WOULD NOT RESET. WENT OUT DURING DESCENT OMITS OWN NO PRESSURE CHANGE NOTED. GROUNDED - YES. C/W PACK/ZONE TEMPERATURE CONTROLLER BITE TEST FOR NR 1 CONTROLLER. ON (BIT) SHOWED RAM AIR ACT, ON ( PREV FLT) SHOWED RAM AIR ACT, ON (VERIFY) NO FAULTS WERE NOTED, NO HISTORY 90 DAYS PREVIOUSLY. OPS NORMAL AT THIS TIME. REF. AMM 21-51-00-700-803.

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