SDR S03J72100

Service difficulty report · Compressor Wheel · Boeing 747400

Difficulty date: December 22, 2003
Submitted: December 26, 2003
Operation: Air carrier
Make and model: Boeing 747400
Aircraft serial: 30765
Engine: Ge CF680C2*
System (JASC): 7230 · Turbine Engine Compressor Section
Part: Compressor Wheel
Condition: Damaged
Location: Nr 4 Engine
Stage of operation: TX
How discovered: O
Nature of condition: R, J
Precautionary procedure: D

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

What was found

DURING TAXING TO RUNWAY, NR 4 ENGINE SPOOLED DOWN, AND COULD NOT ACCELERATE TO IDLE WITH AUTOSTART. NR 3 ENGINE SPOOLED DOWN AND EGT RAISED TO 977 DEGREE DURING AIRCRAFT TAXING BACK TO PARKING SPACE. BORESCOPE INSPECTION FOUND BOTH ENGINES, HPC WERE DAMAGED. AOG TEAM, SPARE ENGINES, TOOL AND REQUIRED MATERIAL WAS LEAVING FOR ENGINE REPLACEMENT.

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