Service difficulty report · Cooling Fan · Boeing 767323

Difficulty date
October 27, 2025
Submitted
October 28, 2025
Operation
Air carrier
Aircraft
N457AZ
Make and model
Boeing 767323
Aircraft serial
25448
Aircraft time
114,664 hours, 20,899 cycles
Part
Cooling Fan
Part number
732591A
Part serial
0224
Condition
Inoperative
Location
Zone 200
Part time
114,664 hours, 20,899 cycles
Stage of operation
IN
How discovered
V
Nature of condition
B
Precautionary procedure
K

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

What was found

DURING PRE-FLIGHT NOTICABLE SMELL OF BURNT WIRE IN THE FIGHT DECK. PLACED ON DEFERRAL 67357 MINIMUM EQUIPMENT LIST 21-58-03-01 CATEGORY C. DUE 06 NOVEMBER 2025. FLIGHT CREW DEBRIEFED AND FOUND THAT FORWARD EQUIPMENT SUPPLY FAN 1 EICAS MESSAGE AND EQUIPMENT COOLING SUPPLY FAN 1 BREAKER WAS OUT. IN ACCORDANCE WITH B767 FAULT ISOLATION MANUAL 21-58 FAULT TREE 904 PUSHED IN BREAKER. REMOVED AND REPLACED FORWARD SUPPLY FAN IN ACCORDANCE WITH B767 AIRCRAFT MAINTENANCE MANUAL 21-58-06. OPERATIONAL CHECK GOOD. DEFERRAL 67357 CLEARED.