Service difficulty report · Transmission · Boeing 7572T7

Difficulty date
August 30, 2024
Submitted
August 30, 2024
Operation
Air carrier
Aircraft
N937FD
Make and model
Boeing 7572T7
Aircraft serial
23895
Aircraft time
75,914 hours, 34,511 cycles
Part
Transmission
Part number
251N402227
Part serial
FX0007
Condition
Dirty
Location
Te Flaps
Part time
12,320 hours, 7,882 cycles
Stage of operation
AP
How discovered
O
Nature of condition
F
Precautionary procedure
O

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

What was found

TE FLAP DISAGREE ON APPROACH. FLAPS STUCK BETWEEN 20-25 DEGREES. EMERGENCY DECLARED. PERFORMED TROUBLESHOOTING PER FIM. FOUND FAULT CODE 305 (FLAP DISAGREE) ON FSEU-1. PERFORMED VISUAL INSPECTION OF ALL FLAP DRIVE TRANSMISSIONS AND JACKSCREWS. FOUND FLAP #5 (LH I/B) OVERLOAD INDICATOR TRIPPED. ALL OTHER GEARBOX'S CHECKED GOOD. DRAINED AND REPLENISHED GEARBOX OIL AND GREASED ENTIRE JACKSCREW AND TRANSMISSION. FOUND #5 GIMBAL DRY OF GREASE. RESET OVERLOAD INDICATOR. PERFORMED OPS TESTS OF FLAP SYSTEMS. WHILE CYCLING FLAPS UP AND DOWN MULTIPLE TIMES, FOUND NO BINDINGS, OR FAULTS. OPS TESTS GOOD.

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