# SDR DALA2026040702218

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 7, 2026
- Submitted: April 7, 2026
- Operation: Air carrier
- Aircraft: [N946DZ](https://openairdocs.org/aircraft/N946DZ), registered now
- Make and model: Boeing 737-9GPER
- Registry model: [Boeing 737-9GPER](https://openairdocs.org/model/boeing-737-9gper) (OpenAirDocs)
- Aircraft serial: 38730
- Aircraft time: 32,114 hours, 17,937 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Sleeve
- Condition: Split
- Location: Acm
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2026040702218

## Discrepancy

ATB/PRESS- RETURNED MCI DUE TO AIRCRAFT WOULD NOT MAINTAIN CABIN PRESSURIZATION. LEFT PACK ON MEL.   FOUND RUBBER SLEEVE BETWEEN ACM AND HEAT EXCHANGER SPLIT. REPLACED SAME. PERFORMED SINGLE PACK CONFIDENCE CHECK. OPS CHECK GOOD. (LOG 8323450 - AIRCRAFT WAS GROUNDED)

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