# SDR ASAA2019102193043

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 19, 2019
- Submitted: October 22, 2019
- Operation: Air carrier
- Aircraft: [N472AS](https://openairdocs.org/aircraft/N472AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60580
- Aircraft time: 18,211 hours, 5,835 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning Light
- Condition: False Activation
- Location: Lt 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/ASAA2019102193043

## Discrepancy

LH PACK LIGHT ON RECALL RESETS WITH MASTER CAUTION RESET. GROUNDED - YES. PERFORMED B737-900 FIM 21-53 TASK 820 AND FOUND TCV FAULT. RAN FIM 21-62 TASK 830, FAULT WAS NOT ACTIVE AND CLEARED . THIS CLEARS MEL 21-33D.

---
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.