NONE · BOEING 757-251 · 1989-10-09 · SAN FRANCISCO, CA, USA
Event
NTSB number
CHI90IA006
Event ID
20001213X29555
Type
Incident
Date
1989-10-09
Location
SAN FRANCISCO, CA, USA
Coordinates
37.799781, -122.399513
Injuries
Highest injury
NONE
Fatal
0
Serious
0
Minor
0
Uninjured
147
Total aboard
147
Aircraft
Make
BOEING
Model
757-251
Registration
N512US
FAR Part
121
Engines
2
Damage
MINR
Conditions
Light
DAYL
Weather
VMC
Probable cause
THE EXTREME WEAR AND EVENTUAL FAILURE OF A TORQUE TUBE IN THE INBOARD TRAILING EDGE FLAP SYSTEM. INSPECTION AND LUBRICATION INTERVALS WERE A FACTOR, AS WAS THE PHYSICAL LOCATION OF THE TORQUE TUBE WITH REFERENCE TO EXTERNAL FACTORS.