# SDR ASAA2020013072015

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 27, 2020
- Submitted: January 31, 2020
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 46,747 hours, 14,187 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Blade
- Condition: Damaged
- Location: Lt Acm
- Part time: 46,777 hours, 14,194 cycles
- Stage of operation: TX
- 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/ASAA2020013072015

## Discrepancy

LEFT PACK TRIP LIGHT CAME ON WHEN TRYING TO USE APU FOR A/C ON THE GROUND. IT WOULD NOT RESET WITH MASTER CAUTION. GROUNDED - YES. CONFIRMED FAULT. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE TEST BOTH LEFT & RIGHT SIDE REF B737-800 AMM 21-61-00-700-806-002, NO FAULTS. DISCONNECTED (D532) FROM COMPRESSOR DISCHARGE OVERHEAT SWITCH REF B737-800 FIM 21-53 TASK 801 "LEFT PACK LIGHT ILLUMINATED & WILL NOT RESET" FAULT ISOLATION, LEFT PACK TRIP LIGHT STAYS OFF. REMOVED L/H ACM REF AMM 21-51-04, FOUND TURBINE BLADES BROKEN & A PIECE DISLODGED TO THE SIDE OF THE INTERIOR WALL & ACM FROZEN. INSTALLED NEW LEFT ACM IAW AMM 21-51-04. ABLE TO CONTROL LT PACK TO 20C DEGREE.

---
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.