NONE · BOEING 747-451 · 2011-10-23 · Detroit, MI, USA
Event
NTSB number
ENG12IA003
Event ID
20111024X74546
Type
Incident
Date
2011-10-23
Location
Detroit, MI, USA
Coordinates
42.349647, -83.059921
Injuries
Highest injury
NONE
Fatal
0
Serious
0
Minor
0
Uninjured
394
Total aboard
394
Aircraft
Make
BOEING
Model
747-451
Registration
N661US
FAR Part
121
Engines
4
Damage
MINR
Conditions
Light
—
Weather
—
Probable cause
The penetration of turbine blade fragments through the rear turbine case, which punctured the No. 4 bearing oil pressure supply tube, allowing misted oil to contact the hot engine case and ignite the undercowl fire. Contributing to the incident was the installation of approved (but not preferred) stage 3 low pressure turbine outer transition duct segments with the riveted rear seal configuration and the failure of the engine design to comply with the engine debris containment requirements of 14 Code of Federal Regulations 33.13 and 33.75.