# SDR CALA2026082118770

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 15, 2026
- Submitted: August 21, 2026
- Operation: Air carrier
- Aircraft: [N27959](https://openairdocs.org/aircraft/N27959), registered now
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft serial: 36407
- Aircraft time: 51,620 hours, 4,948 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: 7110121H01
- Part serial: 4547884
- Condition: Faulted
- Location: Zone 100
- Stage of operation: TX
- How discovered: O
- Nature of condition: B, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026082118770

## Discrepancy

AFTER ENG SHUTDOWN RT PACK ACM FIM DMC-B787-A-21-50-F2-69A-421A-A, FOLLOWED, MAINT MSG 21-65213 LATCHED. RAN SYSTEM TEST IAW FIM AND RT ACM HAS FAILED. STARTING MEL PROCEDURE 2152DB DEACTIVATED RT PACK ACM IAW DDG 21-52-03, AMM DMC-B787-A-21-00-00-58A-721B-A.   MX CONFIRMED NO ACRID ODOR PRESENT ONCE ACM LOCKED OUT & PACK OPERATED. COMPLIED WITH MEL 2152DB.    R & R RT PACK ACM IAW AMM DMC-B787-A-21-52-02-02A-520A-A, & DMC-B787-A-21-52-02-02A-720A-A. OPS CHKD GOOD. GROUND TEST PASSED. LEAK CHKD GOOD. OK TO CONTINUE IN SERVICE. REVERSED MEL. NO STATUS OR MMSG'S.P

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