Service difficulty report · Rib · Boeing 747422

Difficulty date
April 21, 2002
Submitted
May 8, 2002
Operation
Air carrier
Aircraft
N177UA
Make and model
Boeing 747422
Aircraft serial
24384
Aircraft time
52,494 hours, 6,558 cycles
Engine
Pwa PW4056
Part
Rib
Condition
Cracked
Location
Lt Wing
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

LT WING TRAILING EDGE WBL 445.95 RIB LOWER TEE CHORD 65B08150-99 HAS A CRACK IN THE VERTICAL FLANGE BETWEEN 2 FASTENERS. DAMAGE CAN BE VIEWED FROM OUTBOARD END OF INBOARD FLAPWELL BELOW 65B07818 MIDFLAP DEFLECTOR RAMP. MAJOR REPAIR WAS ACCOMPLISHED ON THE LEFT HAND WING TRAILING EDGE RIB LOWER TEE CHORD.