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Single Turbine Engine Aircraft
Is Two safer than One? No!
Is Two safer than One? No!
Accident Data
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:
Single Engine
Turboprops
Turboprops
18
3.62
4.97
6.84
3.54
US Light Twins FAA data Non scheduled
Piston
Turboprop
Piston
Turboprop
161
34
15.844
5.618
10.16
6.05
11.2
7.61
9.15
4.77
UK all light Multi
Airline operations
Piston
Turboprop
Combined
Airline operations
Piston
Turboprop
Combined
3
1
4
0.133
0.052
0.185
22.5
19.3
21.7
50.2
74.8
43.2
8.29
2.03
9.41
From CAA, NTSB, FAA
Twin Otter
Scheduled only
Twin Otter
Scheduled only
2
0.8460
2.36
6.29
0.63
French Light twins
Plus taxi operations *
Piston
Turboprop
Combined
Plus taxi operations *
Piston
Turboprop
Combined
3
4
7
0.043
0.333
0.376
69.6
12.0
18.6
155.4
24.0
31.3
25.6
5.2
10.4
Table 2.0 Overall Fatal accident rates (Commercial Operations)
* Based on year 2000 utilisation
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
