NONE · BOEING 737-201 · 1989-01-20 · CHICAGO, IL, USA
Event
NTSB number
CHI89MA046
Event ID
20001213X27558
Type
Accident
Date
1989-01-20
Location
CHICAGO, IL, USA
Injuries
Highest injury
NONE
Fatal
0
Serious
0
Minor
0
Uninjured
33
Total aboard
33
Aircraft
Make
BOEING
Model
737-201
Registration
N242US
FAR Part
121
Engines
2
Damage
SUBS
Conditions
Light
DAYL
Weather
VMC
Probable cause
PREVIOUS DAMAGE TO THE AFT CONE (ENGINE MOUNTING) BOLT, WHICH RESULTED IN MISMATCHED SURFACES BETWEEN THE BOLT AND ISOLATION MOUNT, LOSS OF TORQUE DURING CYCLIC LOADING OF THE MOUNTING BOLT, AND SUBSEQUENT FATIGUE FAILURE OF THE BOLT.