Service difficulty report · Rib · Boeing 747422

Difficulty date
July 16, 2004
Submitted
March 15, 2005
Operation
Air carrier
Aircraft
N187UA
Make and model
Boeing 747422
Aircraft serial
26876
Aircraft time
45,700 hours, 5,553 cycles
Engine
Pwa PW4056
System (JASC)
5751 · Ailerons
Part
Rib
Part number
65B0813044
Condition
Cracked
Location
Aileron
Part time
45,701 hours, 5,554 cycles
Stage of operation
CL
How discovered
O
Nature of condition
E
Precautionary procedure
O

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

What was found

SIGNIFICANT SHUDDER ON CLIMBOUT WITH RIGHT O/B AIL. *S/D* THE NR 2 RIGHT OUTBOARD AILERON HINGE FITTING WAS FOUND CRACKED DUE TO FATIGUE. THE CRACKED FITTING WAS REPLACED.