NONE · BOEING 747-136 · 1988-05-09 · CHICAGO, IL, USA
Event
NTSB number
CHI88FA110
Event ID
20001213X25642
Type
Accident
Date
1988-05-09
Location
CHICAGO, IL, USA
Injuries
Highest injury
NONE
Fatal
0
Serious
0
Minor
0
Uninjured
304
Total aboard
304
Aircraft
Make
BOEING
Model
747-136
Registration
GAWND
FAR Part
129
Engines
4
Damage
SUBS
Conditions
Light
DAYL
Weather
VMC
Probable cause
FAILURE OF THE NUMBER THREE FLAP TRACK DUE TO STRESS CORROSION CRACKING. FACTORS CONTRIBUTING TO THIS FAILURE ARE INSUFFICIENT DESIGN OF THE MEMBER AND INADEQUATE INSPECTION AND MAINTENANCE PROCEDURES TO DETECT CRACKS BEFORE THEY PROPAGATE TO A CRITICAL LENGTH.