NONE · BOEING 747-121 · 1993-03-31 · ANCHORAGE, AK, USA
Event
NTSB number
DCA93MA033
Event ID
20001211X11963
Type
Accident
Date
1993-03-31
Location
ANCHORAGE, AK, USA
Coordinates
61.159198, -149.990325
Injuries
Highest injury
NONE
Fatal
0
Serious
0
Minor
0
Uninjured
5
Total aboard
5
Aircraft
Make
BOEING
Model
747-121
Registration
N473EV
FAR Part
129
Engines
4
Damage
SUBS
Conditions
Light
DAYL
Weather
VMC
Probable cause
THE LATERAL SEPARATION OF THE NO. 2 ENGINE PYLON DUE TO AN ENCOUNTER WITH SEVERE OR POSSIBLY EXTREME TURBULENCE THAT RESULTED IN DYNAMIC MULTI-AXIS LATERAL LOADINGS THAT EXCEEDED THE ULTIMATE LATERAL LOAD-CARRYING CAPABILITY OF THE PYLON, WHICH WAS ALREADY REDUCED BY THE PRESENCE OF THE FATIGUE CRACK NEAR THE FORWARD END OF THE PYLON'S FORWARD FIREWALL WEB.