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Table 1 Statistics for the IAT (interarrival time between repair requests) 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) \({\tfrac {Q_{1}+2Q_{2}+Q_{3}}{4}}\) mean (25 %) mean (5 %) deviation of variation
(a) Valve Ckeck (HTE400115) 12 59.45 25.5 48 96.5 54.5 55.56   49.24 0.83
(b) Valve control wing anti-ice (SAS911-002A) 72 12.77 2 5 11 5.75 6.27 10.51 28.64 2.24
(c) Flow control valve (1303A0000-04) 79 11.12 2 7 14.75 7.69 8.57 10.28 13.56 1.22
(d) Valve engine anti-ice (324195-1) 16 54.2 9 29 100.5 41.88 51.85   52.74 0.97
(e) Valve starter shutoff (3290064-17) 46 17.84 2 5 15 6.75 10 13.35 36.34 2.04
(f) Valve starter shutoff (3290064-20) 88 9.87 2 7 13.5 7.38 8.07 8.99 10.67 1.08
(g) Valve starter shutoff (3291556-3) 14 28 17 26 33 25.5 27   18.23 0.65
(h) Thermostat control temperature (342B040000) 65 11.81 1 4 13.25 5.56 7.58 11.11 16.77 1.42
(i) Auxiliary power unit (3800278-4) 25 34.58 17.5 38 43.75 34.31 33 34.58 24.23 0.7
(j) Actuator (65-20892-13) 82 12 0 0 11 2.75 4.97 8.88 27.12 2.26
(k) Bleed pressure regulating valve (6714D070000) 10 59.11 36 46 104 58 58.86   43.98 0.74
(l) Bleed pressure regulating valve (6774E010000) 87 10.42 3 7 16.75 8.44 8.89 9.83 9.93 0.95
(m) Exchanger heat (753A0000-03) 11 89.4 40.25 99 130.25 92.13 91.5   53.37 0.6
(n) Element filter (856504-5) 10 29.67 20 29 37 28.75 28.86   17.25 0.58
(o) Valve pneu press regulator (898626-3) 11 103.6 7.75 12 88.75 30.13 64.63   178.67 1.72