Service difficulty report · Bolt · Boeing 747422

Difficulty date
May 11, 2000
Submitted
October 4, 2000
Operation
Air carrier
Aircraft
N179UA
Make and model
Boeing 747422
Aircraft serial
25158
Engine
Pwa PW4056
Part
Bolt
Part number
69B136821
Condition
Cracked
Location
Trunnion
Part time
82,780 hours, 19,723 cycles
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

ON WALKAROUND, FOUND 1.125 INCH DIA H-11 BOLT BROKEN AT STATION 1480 BODY LANDING GEAR INBOARD TRUNNION SUPPORT FITTING. *S/D* CAUSE WAS DUE TO STRESS CORROSION. REPLACED BOLT (69B13682-1) AND PERFORMED ULTRASONIC INSPECTED ADJACENT (2) BOLTS COMMON TO FITTING FOR CRACKS, NONE FOUND.