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 |