# SDR AALA202501225598

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 17, 2025
- Submitted: January 22, 2025
- Operation: Air carrier
- Aircraft: [N822NN](https://openairdocs.org/aircraft/N822NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31085
- Aircraft time: 44,849 hours, 18,883 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Control Valve
- Part number: 213A12023
- Condition: Failed
- Location: Zone 100
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202501225598

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: RIGHT PACK TRIP OFF LIGHT CAME ON, STAYED ON EVEN WITH PACK RESET, HAD TO DESCENDED TO 10,000 WOULD NOT HOLD PRESSURE; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT BOS. REMOVED AND REPLACED RIGHT HAND PACK ACM (AALA202501215685), PER AMM 21-51-04. REMOVE AND REPLACED PRIMARY (AALA202501229903) AND SECONDARY (AALA202501229679) HEAT EXCHANGER, PER J/C 08L13221001. REMOVE AND REPLACED DIFFUSER ASSEMBLY (AALA202501224784), PER AMM 21-51-03. REMOVE AND REPALCED FLOW CONTROL VALVE (AALA202501225598), PER AMM 21-51-01. RAN PACK NO LEAKS OPERTIONAL CHECK NORMAL.

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