Service difficulty report · Turbine Case · Boeing 7478F

Difficulty date
April 3, 2026
Submitted
April 6, 2026
Operation
Air carrier
Aircraft
N606UP
Make and model
Boeing 7478F
Aircraft serial
64253
Aircraft time
33,022 hours, 4,808 cycles
Engine
Ge GENX2B67B
Part
Turbine Case
Condition
Cracked
Location
Nr 1 Engine
Component
Engine · Ge
Component part number
GENX2B67PG01
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

OPENED NR 1 ENG TO ACCESS FAMV, FOUND ENGINE 1 HEAVILY SOILED WITH SOOT AND HYD FLUID. SIGNS OF OVERHEATING FOUND MELTED CLAMPS OF WIRE HARNESSES. HYD CONNECTION BOX THROWS HEAT BUBBLES. CONTINUED T/S IAW FIM: G75-23-00-810-805. FOUND CRACK IN TOP FUEL MANIFOLD. IDG FEEDER CABLE OUTER ISOLATION BURNED OFF IN FAMV AREA AND CLAMPS BURNED OFF. FOUND HEAT BUBBLES AND SOOT ON INBOARD FWD ENGINE STRUT STRUCTURE, FWD OF THE FAMV DUE TO OVERHEAT CONDITION. HYD SUPPLY HOSE AT RACEWAY SERVICE DISONNECT PANEL AREA LEAKING & HEAT BUBBLES ON SPRAY BLANKET. FOUND ELECTRICAL CONNECTOR ON FAMV DAMAGED. OPENED SEPERATE FAULTS FOR FINDINGS. CONFIRMED ALL TOOLS AND PARTS REMOVED FROM AIRCRAFT.

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