# SDR SWIA202505140012

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 12, 2025
- Submitted: May 14, 2025
- Operation: Air carrier
- Aircraft: [N920EV](https://openairdocs.org/aircraft/N920EV), registered now
- Make and model: Cndair CL6002B19
- Aircraft serial: 7810
- Aircraft time: 41,692 hours, 40,966 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Condition: Overtemp
- Location: Zone 100
- Stage of operation: DE
- How discovered: O
- Nature of condition: M, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWIA202505140012

## Discrepancy

D: DURING DESCENT NOTICED A STRANGE SMELL IN THE COCKPIT AS WELL AS A SMALL PUFF OF SMOKE OUT OF THE FO?S AIR VENT.  AFTER LANDING WE CHECKED THE ECS PAGE AND SAW THE LEFT PACK UNCONTROLLABLY INCREASING. WE SHUT DOWN THE LEFT PACK AROUND 110 C. PACK COOLED DOWN TO 60 C AND WE TURNED IT BACK ON WITH THE TEMPERATURE SET AS LOW AS POSSIBLE AND THE PACK TEMPERATURE CONTINUED TO INCREASE UNCONTROLLABLY.C: MEL 21-51-1BCAT C DUE 05/22/25**SMOD APPROVAL REQUIRED FOR RTS**DURING DESCENT NOTICED A STRANGE SMELL IN THE COCKPIT AS WELL AS A SMALL PUFF OF SMOKE OUT OF THE FO€™S AIR VENT.  AFTER LANDING WE CHECKED THE ECS PAGE AND SAW THE LEFT PACK UNCONTROLLABLY INCREASING. WE SHUT DOWN THE LEFT PACK AROUND 110 C. PACK COOLED DOWN TO 60 C AND WE TURNED IT BACK ON WITH THE TEMPERATURE SET AS LOW AS POSSIBLE AND THE PACK TEMPERATURE CONTINUED TO INCREASE UNCONTROLLABLY.   (FLIGHT 5023 - FILED CLOSED)MAY 12, 2025  STATION: DDC--DEFERRED PER MEL 21-51-1BLOCATION: AIR-CONDITIONING PACK - LEFT PACK INOPERATIVENO MAINTENANCE ACTION REQUIRED MAY 13, 2025  STATION: COS -- SEE CAMP 30133654 AND CP 30133674 FOR MX ACTION ON L/H ACM REPLACEMENT, L/H HEAT EXHANGER REPLACEMENT. OPS CHECK GOOD AT THIS TIME. REMOVED DMI PLACARD .

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