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 |