# SDR CALA2026031814655

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 11, 2026
- Submitted: March 18, 2026
- Operation: Air carrier
- Aircraft: [N14120](https://openairdocs.org/aircraft/N14120), registered now
- Make and model: Boeing 757224
- Aircraft serial: 27562
- Aircraft time: 98,643 hours, 23,994 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Exhaust Valve
- Part number: 566918
- Part serial: 5621
- Condition: Faulted
- Location: Zone 100
- Part time: 105,639 hours, 25,440 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026031814655

## Discrepancy

AFTER TAKEOFF,  PILOTS HEARD AN AUDIBLE POP, FOLLOWED BY SIGNIFICA NT VENT NOISE. PER CREW VERBAL, NOISE WAS EXTREME COMING FROM OVERHEAD IN FLIGHT COMPARTMENT, COULD NOT HEAR RADIO TRANSMISSIONS.  ACCOMP FIM 21-20 TASK 801 FOR LOUD AIR NOISE IN COCKPIT. REPLACED OVERBOARD EXHAUST VALVE IAW MM 21-58-05. OPS CHECKED NORMAL.

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