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Single Turbine Engine Aircraft
Is Two safer than One? No!

Accident Data

Fatal
Accidents

Hours
(Millions)

Actual Figure
Accident rate
/million hours

90% Confidence
that the true figure
does not exceed:

90% Confidence
that the true figure
Is not lower than:

Single Engine
Turboprops

0*Note

1*Note

5.43

5.43

0

0.184

0.424

0.716

0

0.019

Single Engine
Turboprops
FAA Data Non scheduled

1.049

2.19

Cessna 402 ,421
Piston Twins US(NTSB)

0.816

3.68

8.18

1.35

US Light Twins FAA data
Non scheduled
Piston
Turboprop
Combined

35
5
40

15.844
5.6180
21.462

2.21
0.89
1.86

2.77
1.65
2.30

1.75
0.43
1.50

Green. Fatal accident rate the same or less than Single Turbine Engine Aircraft
Red. Fatal accident rate worse than Single Turbine Engine Aircraft

Cont/

1.0 Fatal accident rates following Power Loss (Commercial Operations)

*Note: The one fatal accident in Western commercial operations involved a take-off with the fuel cocks from both tanks off. This resulted in a design change and modification making that cause highly unlikely to occur again. The result in a twin would be likely to be no different. This accident might reasonably be discounted as regards an indicator for future operations. The commercial accident rate would then be zero. Data for one fatal accident has also been included for

Table 1.0 Fatal accident rates following Power Loss (Commercial Operations)

Table 2.0 Overall Fatal accident rates (Commercial Operations)
Table 3.1 Loss of power events: Cessna C208 Caravan (US Operations)
Table 3.2 Fatal Accidents events: Cessna C208 Caravan (US Commercial Operations)
Table 4.0 Loss of power events: Pilatus PC-12