# SDR ASAA2020032532535

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 23, 2020
- Submitted: March 25, 2020
- Operation: Air carrier
- Aircraft: [N536AS](https://openairdocs.org/aircraft/N536AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35203
- Aircraft time: 31,703 hours, 9,048 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: 22064002
- Part serial: 8736
- Condition: Failed
- Location: Ac Bay
- Part time: 31,711 hours, 9,051 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/ASAA2020032532535

## Discrepancy

RIGHT PACK TRIP OFF CAUTION MESSAGE TRIED TO RESET PER QRH AND FAILED AGAIN. PACK TEMP WAS 58 DEGREES DURING FAILURE DURING CLIMB OUT. GROUNDED - YES. FOUND ACM TO BE GRINDING. REPLACED ACM REF B737-800 AMM 21-51-04. PERFORMED PACK/ZONE BITE TEST - RAM SENSOR DISPLAYS FAULT ON BITE BOX. RIGHT PACK REMAINS ON MEL 21-1F.  ACCOMPLISHED B737-800 FIM 21-62 TASK 820 RESET PACK TEMP CONTROLLER. RAN PACKS FOR 2 HRS AT VARIOUS SETTINGS. PERFORMED MULTIPLE BITE TESTS IN PERIOD & NO FAULTS NOTED. ALL OPS NORMAL. SUSPECT FAULT WAS SET WHILE ACCOMPLISHING TSR7804970. THIS CLEARS MEL 21-1F.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.