Service difficulty report · Cooling Fan · Boeing 757224

Difficulty date
February 21, 2025
Submitted
February 24, 2025
Operation
Air carrier
Aircraft
N19141
Make and model
Boeing 757224
Aircraft serial
30354
Aircraft time
85,482 hours, 20,376 cycles
Part
Cooling Fan
Part number
731376A
Part serial
2251
Condition
Shorted
Location
Zone 100
Part time
61,082 hours, 1,586,500 cycles
Stage of operation
CR
How discovered
O
Nature of condition
B
Precautionary procedure
H

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

What was found

STRONG ELECTRICAL BURN SMELL IN FLIGHT FOUND CB FWD EQUIP COOL SUPPLY FAN 1 (F17) ON THE P6 PANEL POPPED. RESET CB PER GMM 05-30-05 AND PERFORMED OPS TEST OF FWD EQUIP COOL SUPPLY FAN REF AMM 21-58-06. CB IMMEDIATELY POPS WHEN EQUIP COOLING SWITCH IS DEPRESSED IN THE NORMAL POSITION ALON WITH FWD EQ SUP FAN 1 MESSAGE AND OVERHEAT STATUS ON SWITCH. COMPLIED WITH STEP 1A AND 1B OF AMM 05-51-58-910-801-C1 AND CONFERRED WITH TOMC AFTER THEY RECEIVED THE FLIGHT CREW AND CABIN CREW QUESTIONAIRES. TOMC AGREES THAT DUE TO THE HISTORY OF THE EQUIPMENT COOLING FAN AND THE FINDING OF THE EQUIPMENT COOLING SUPPLY FAN CB NOT STAYING IN, IT IS NOT NECCESSARY TO CONTINUE WITH NEXT STEPS OF AMM 05-51-58-910-801-C1. VERIFIED EQUIPMENT COOLING SUPPLY FAN M&E # 19-2158-9-0001 IS IN STOCK AT ORD. UNLOCKED. ITEM TO BE CLEARED UNLOCKED REMOVED EQUIPMENT COOLING FAN CONNECTER FROM FAN MOTOR AND OPERATED EQUIPMENT COOLING AND CIRCUIT BREAKER STAYED CLOSED , RECONNECTED CONNECTOR AND CB POPPED,REMOVED AND REPLACED RT FWD EQUIPMENT COOLING FAN IAW 21-58-06-414-007, OP CHECK AS ADVERTIZED NO FURTHER DEFECT NOTED,