Types of aircraft

Period

Mean value

SD

CV

All (large/small)

3 months

2.2

(6.9)

6.4

(47.8)

2.87

(6.96)

6 months

4.4

(13.7)

8.8

(67.3)

1.98

(4.90)

1 year

8.8

(27.5)

11.8

(94.3)

1.34

(3.44)

Small airplanes

3 months

1.3

(1.3)

2.0

(2.0)

1.62

(1.62)

6 months

2.5

(2.5)

2.9

(2.9)

1.15

(1.15)

1 year

5.0

(5.0)

4.4

(4.4)

0.87

(0.87)

Large airplanes

3 months

1.0

(5.6)

6.1

(47.8)

6.14

(8.52)

6 months

2.0

(11.2)

8.5

(67.4)

4.30

(6.00)

1 year

4.0

(22.5)

12.0

(94.6)

3.01

(4.21)

Helicopters

3 months

1.4

(1.4)

2.8

(2.8)

2.01

(2.01)

6 months

2.8

(2.8)

4.2

(4.2)

1.48

(1.48)

1 year

5.6

(5.6)

5.8

(5.8)

1.03

(1.03)