# SDR ASAA2023082044669

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 20, 2023
- Submitted: August 24, 2023
- Operation: Air carrier
- Aircraft: [N478AS](https://openairdocs.org/aircraft/N478AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44105
- Aircraft time: 30,015 hours, 9,451 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: IN
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023082044669

## Discrepancy

RIGHT PACK LIGHT ILLUMINATES ON RECALL, EXTINGUISHES WHEN RESET. GROUNDED - YES. INITIAL EVAL, RH PACK LT ILLUMINATED ON P5 OVERHEAD WITH MASTER RECALL. PERFORMED PZTC BITE IAW FIM 21-62 TASK 801. LH PZTC, NO FAULTS. RH PZTC HAD TCV ON BIT, CLEARED GREEN ON VERIFY. PER FIM 21-62 TASK 831, NO FURTHER ACTION NECESSARY. RE RAN BITE, SAME RESULT. NO A/C HISTORY FOR RH PACK LT OR TCV. THIS CLEARS MEL 21-32B. SEAMC PETER NOTIFIED. PLACARDS REMOVED. NO A/C CONFIG CHANGES.

---
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.