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Single Turbine Engine Aircraft
Is Two safer than One? No!
Is Two safer than One? No!
Accident Data
1.0 Fatal accident rates following Power Loss (Commercial Operations continued)
Fatal Accidents
Hours (Millions)
Actual figure
accident rate
/million hours
accident rate
/million hours
90% Confidence
that the true figure
does not exceed:
that the true figure
does not exceed:
90% Confidence
that the true figure
Is not lower than:
that the true figure
Is not lower than:
UK all light Multi
Airline operations
Piston
Turboprop
Combined
Airline operations
Piston
Turboprop
Combined
1
0
1
0.133
0.052
0.185
7.52
0
5.41
29.2
44.2
21.0
0.79
0
0.57
French Light twins
Plus taxi operations *
Piston
Turboprop
Combined
Plus taxi operations *
Piston
Turboprop
Combined
1
0
1
0.043
0.333
0.376
23.2
0
2.66
90.5
6.9
10.3
2.45
0
0.28
Green. Fatal accident rate the same or less than Single Turbine Engine Aircraft
Red. Fatal accident rate worse than Single Turbine Engine Aircraft
Red. Fatal accident rate worse than Single Turbine Engine Aircraft
* DGAC state that their estimates of utilisation likely to be too low
The JAA SE-IMC Working Group were only asked to include accidents to aircraft that weighed less than 5400kgs, if they have moved the weight to include the Commuter category aircraft such as the Bandeirante and Shorts 330 series then the UK twin turbine engine aircraft figures would have been significantly worse.
Cont/