Type of aircraft

Period

Probability distribution

Exponential

Lognormal

Beta

Gamma

Airplane (large/small)

Entire period

29.90

34.50

40.80

33.80

I

8.59

40.70

13.10

18.50

II

10.30

10.60

8.21

8.43

III

3.43

3.77

6.85

5.48

Small airplane

Entire period

18.10

38.10

28.10

29.60

I

6.80

12.80

21.20

15.80

II

11.90

10.70

17.00

20.70

III

6.76

5.26

11.50

9.40

Large airplane

Entire period

5.83

13.70

2.66

10.60

I

4.22

3.35

2.91

4.22

II

0.97

1.78

3.14

1.51

III

1.75

2.75

0.25

1.25

Helicopter

Entire period

39.30

35.10

60.70

39.60

I

14.40

8.74

21.20

11.60

II

19.40

15.70

15.20

17.80

III

12.70

5.37

16.20

16.70