# SDR CALA2026070117497

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 29, 2026
- Submitted: July 1, 2026
- Operation: Air carrier
- Aircraft: [N654UA](https://openairdocs.org/aircraft/N654UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 25392
- Aircraft time: 129,835 hours, 20,009 cycles
- System (JASC): [2121 · Air Distribution Fan](https://openairdocs.org/jasc/2121)
- Part: Fan
- Condition: Faulted
- Location: Zone 200
- Stage of operation: NR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026070117497

## Discrepancy

AT TOP OF DESCENT LOUD POPPING NOISE FOLLOWED BY LOUD AIR SURGE SOUND FOLLOWED BY A BURNING SMELL FOR ONE MINUTE THEN THE SOUND OF THE CIRCUIT BREAKER POPPED.FWD EQ EXH FAN EICAS S THE FORWARD EQUIPMENT EXHAUST FAN HAS A FAILURE.FWD EQUIPMENT CIRCUT BREAKER AUDIBLE POP AND STATUS MESSAGE REQUESTING MEL 2158F FOR FWD EQUIP COOLING EXHAUST FAN, INSUFFICIENT GROUND TIME TO WORK. QUICK TURN. CB PULLED AND EQUIPMENT COOLING SWITCH IS STANDBY. AS REPORTED BY CREW, REPORTED BURNING SMELL FOLLOWING CB POPPING. SMOKE/ODOR FORM REQUIRED. APPROVED DEFER FWD EQ EXH FAN PER MEL 2158F.

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