Service difficulty report · Structure · Boeing 747422

Difficulty date
March 10, 2013
Submitted
March 13, 2013
Operation
Air carrier
Aircraft
N179UA
Make and model
Boeing 747422
Aircraft serial
25158
Aircraft time
91,132 hours, 10,946 cycles
Engine
Pwa PW4056
Part
Structure
Condition
Gouged
Location
Rudder
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

UPPER RUDDER CONTROL MODULE MOUNT TRUNNION LOWER RIGHT ATTACH BORE IS GOUGED AND SCORED. CHIPPED AREA DIMENSIONS, .250 X .150 WITH A DEPTH OF .140. BLENDED GOUGED AREA FROM BOLT THREADS OUT TO .015" OVER FROM .312", DEPTH INTO BORE .312". NEEDS EDDY CURRENT INSP AND EG APPROVAL TO CONTINUE FOR RUD PCU INSTALLATION. ACCOMPLISHED EDDY CURRENT OF INNER BORE PER NDT MANUAL PART 6, 51-00-00, PROCEDURE 11.