Types of aircraft

Period

Probability distribution

Mean value

Exponential

Lognormal

Beta

Gamma

(Actual measurement)

Beta (1/λ)

Mu (μ)

Sigma (σ)

p

q

Alpha

Beta

Airplane (large/small)

Entire period

29.0

29.0

2.8

1.2

0.8

27.6

1.1

26.4

I

21.4

21.4

2.6

1.1

1.0

7.6

1.3

17.1

II

30.2

30.2

2.9

1.2

0.8

3.9

1.1

27.5

III

40.6

40.6

3.2

1.2

1.0

9.3

1.1

37.2

Small airplane

Entire period

38.6

38.6

3.1

1.2

0.9

10.7

1.0

36.8

I

27.8

27.8

2.9

1.1

1.1

9.0

1.2

23.2

II

40.6

40.6

3.2

1.2

0.9

10.7

1.1

37.2

III

55.9

55.9

3.5

1.2

0.8

3.6

1.0

53.8

Large airplane

Entire period

113.0

113.0

4.2

1.2

0.8

2.3

1.1

100.8

I

91.2

91.2

4.1

1.2

0.8

1.4

1.2

72.9

II

118.1

117.1

4.3

1.1

0.8

1.7

1.2

98.2

III

138.6

134.6

4.5

1.2

0.8

1.3

1.3

104.1

Helicopter

Entire period

32.5

32.5

2.8

1.3

0.8

8.9

0.8

38.7

I

22.8

22.8

2.5

1.2

0.8

4.6

1.0

23.4

II

32.2

32.2

2.8

1.3

0.8

17.5

0.9

37.0

III

55.4

55.4

3.3

1.3

0.8

10.2

0.8

65.8