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Table 2 Statistics for the MdO (man hours required for repair) of several components

From: Scheduling the repair of aircraft components - a case study

Aircraft component

N

Mean

Lower

Median

Upper

Trimean

Trimmed

Trimmed

Standard

Coefficient

   

quartile (Q 1)

(Q 2)

quartile (Q 3)

\({\frac {Q_{1}+2Q_{2}+Q_{3}}{4}}\)

mean (25 %)

mean (5 %)

deviation

of variation

(a) Valve Ckeck (HTE400115)

12

5

3.51

5.03

6.41

5

4.98

 

2.28

0.46

(b) Valve control wing anti-ice (SAS911-002A)

72

11

5.19

7.47

14.36

8.62

9.2

10.96

10.25

0.9

(c) Flow control valve (1303A0000-04)

79

14

7.33

11.7

17.74

12.12

12.42

13.36

10.54

0.76

(d) Valve engine anti-ice (324195-1)

16

25

6.46

25.85

34.89

23.26

22.07

 

21.85

0.86

(e) Valve starter shutoff (3290064-17)

46

13

5.64

12.19

18.73

12.18

11.95

12.72

9.1

0.7

(f) Valve starter shutoff (3290064-20)

88

14

6.65

12.26

17.38

12.13

12.18

13.14

10.76

0.77

(g) Valve starter shutoff (3291556-3)

14

10

7.64

9.19

11.05

9.26

9.79

 

5.1

0.49

(h) Thermostat control temperature (342B040000)

65

6

0.75

1.5

11.75

3.88

4.67

6.02

7.64

1.21

(i) Auxiliary power unit (3800278-4)

25

15

6.08

10.93

17.57

11.38

11.44

15.49

19.27

1.24

(j) Actuator (65-20892-13)

82

9

1.65

8.7

13.89

8.24

8.28

8.67

7.42

0.82

(k) Bleed pressure regulating valve (6714D070000)

10

22

5.55

12.62

41.66

18.11

20.91

 

19.46

0.89

(l) Bleed pressure regulating valve (6774E010000)

87

4

0.75

3.14

5.73

3.19

3.36

3.97

4.16

0.99

(m) Exchanger heat (753A0000-03)

11

24

5.62

9.94

42.69

17.05

21.28

 

22.33

0.93

(n) Element filter (856504-5)

10

3

2.12

2.83

3.58

2.84

3.05

 

2.11

0.64

(o) Valve pneu press regulator (898626-3)

11

38

14.95

22.97

49.65

27.63

30.67

 

37.77

0.98

  1. N is the sample size