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Table 3 Statistics for the TAT (turn-around-time in days) 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 43 6 22 57.75 26.94 37.6   48.26 1.13
(b) Valve control wing anti-ice (SAS911-002A) 72 23 3 9.5 20.25 10.56 12.81 20.3 37.1 1.64
(c) Flow control valve (1303A0000-04) 79 16 3 6 20 8.75 11.43 15.23 20.7 1.28
(d) Valve engine anti-ice (324195-1) 16 56 7.5 24.5 77.5 33.5 40.17   68.53 1.22
(e) Valve starter shutoff (3290064-17) 46 11 4.25 7 17 8.8 10.03 10.8 9.72 0.86
(f) Valve starter shutoff (3290064-20) 88 11 4 7 14.25 8.06 8.83 10.39 11.26 1
(g) Valve starter shutoff (3291556-3) 14 8 4.25 7 8.75 6.75 6.75   5.83 0.76
(h) Thermostat control temperature (342B040000) 65 32 21 24 35 26 27.78 31.7 22.87 0.71
(i) Auxiliary power unit (3800278-4) 25 48 6 17 51 22.75 28.16 48.08 77.80 1.62
(j) Actuator (65-20892-13) 82 68 22.5 49 75 48.88 51.47 62.24 71.09 1.05
(k) Bleed pressure regulating valve (6714D070000) 10 32 7 24 61.25 29.06 31.13   29.86 0.92
(l) Bleed pressure regulating valve (6774E010000) 87 32 22.5 35 42 33.63 31.93 31.77 18.19 0.56
(m) Exchanger heat (753A0000-03) 11 39 28.5 35 52 37.63 38.33   21.89 0.56
(n) Element filter (856504-5) 10 57 45.75 56.5 70.75 57.38 57.5   14.97 0.26
(o) Valve pneu press regulator (898626-3) 11 147 56 132 150 117.5 111.56   155.24 1.05
  1. N is the sample size