Service difficulty report · Cooling Fan · Boeing 7474KZF

Difficulty date
June 27, 2025
Submitted
June 30, 2025
Operation
Air carrier
Aircraft
N405KZ
Make and model
Boeing 7474KZF
Aircraft serial
36132
Aircraft time
61,797 hours, 11,472 cycles
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

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

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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