Service difficulty report · Fuse · Boeing 7377H4

Difficulty date
October 21, 2026
Submitted
October 23, 2026
Operation
Air carrier
Aircraft
N477WN
Make and model
Boeing 7377H4
Aircraft serial
33988
Aircraft time
73,506 hours, 44,168 cycles
Part
Fuse
Condition
Faulted
Location
Zone 100
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

LEADING EDGE FLAPS AND SLATS, ONE OR MORE LEADING EDGE DEVICES 123 AND 4 SLATS 5678 SHOWED IN TRANSIT DURING FLIGHT. TROUBLESHOT PER FIM 27-81 TASK 812. CHECKED FOR BYPASSING LE ACTUATORS AND LE UCM VALVE NO BYPASSING NOTED. RANG OUT WIRES A11 AND D12 IN CONNECTOR D728A NO DEFECTS NOTED. SUSPECT LE RETRACT FUSE TO BE INTERMITTENTLY FAULTY REMOVED AND REPLACED LE RETRACT FUSE REF AMM 27-81-61 OPS AND LEAK CHECKS GOOD. LE SLATS OPERATE NORMALLY.

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