Service difficulty report · Blades · Boeing 747422

Difficulty date
November 12, 2004
Submitted
November 23, 2004
Operation
Air carrier
Aircraft
N174UA
Make and model
Boeing 747422
Aircraft serial
24381
Aircraft time
56,783 hours, 6,386 cycles
Engine
Pwa PW4056
Part
Blades
Condition
Failed
Location
Nr 4 Engine
Stage of operation
CL
How discovered
O
Nature of condition
R, J
Precautionary procedure
E, J, A

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

What was found

NR 4 ENGINE SHUT DOWN DUE TO HIGH EXHAUST GAS TEMPERATURE & LOSS OF POWER. ENGINE EXPERIENCED SURGE AFTER TAKEOFF. UPON INVESTIGATION FOUND MASSIVE HPC DAMAGE. ROOT CAUSE OF THE FAILURE WAS THE 6TH STAGE BLADE DETACHMENT THIS IS AN INDUSTRY ISSUE WITH THE FRONT END DURABILITY BEING WORKED BY THE OEM.