# SDR UIEA2025062700816

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 27, 2025
- Submitted: June 30, 2025
- Operation: Air carrier
- Aircraft: [N405KZ](https://openairdocs.org/aircraft/N405KZ), registered now
- Make and model: Boeing 747-4KZF
- Registry model: [Boeing 747-4KZF](https://openairdocs.org/model/boeing-747-4kzf) (OpenAirDocs)
- Aircraft serial: 36132
- Aircraft time: 61,797 hours, 11,472 cycles
- System (JASC): [2121 · Air Distribution Fan](https://openairdocs.org/jasc/2121)
- Part: Cooling Fan
- Part number: 4100149C
- Part serial: 1054
- Condition: Failed
- Location: Zone 100
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: G, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2025062700816

## Discrepancy

ELECTRICAL BURNING SMELL, SMOKE IN COCKPIT ON INITIAL CLIMB. EQUIP COOLING EICAS FOLLOWED, THEN EICAS SCREEN BLANKED AFTER APPROX 60 SEC.  PERFORMED AMM 05-51-56 SMOKE INSPECTION. FOUND COOLING FAN AT FAULT.  REPLACED E/E COOLING FAN PER AMM 21-58-01. CMC TEST PASSED.

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