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Correct Answer : weight at end of the phase to that of at the begin
Explanation : Mission leg is nothing but the individual mission segment or phase. Mission leg fuel fraction is weight of the fuel at end of the phase to that of at beginning of that mission leg.
Correct Answer : Option (C) : 4430kg
Explaination : Given crew weight = 150kg, payload weight = 600kgFuel weight fraction Wf / W0 = 1.06[1 – Wx/W0],Now from fuel fraction method,Wx / W0 = multiplication of each phase fraction= 0.975*0.98*0.96*0.8*0.96*0.97= 0.6833Now,Wf / W0 = 1.06 * [1 – (Wx / W0)] = 0.3357Empty weight fraction We / W0 = 0.481Gross weight of aircraft is,W0 = Wcrew + Wpayload + Wfuel + WemptyBy re-arranging,W0 = Wcrew + Wpayload / [1 – (Wf/ W0) – (We / W0)] = 150 + 600 / [1-0.3357-0.495] = 4430kg
Correct Answer : Option (C) : fuel, crew, payload and empty weight
Explanation : Total take-off gross weight is nothing but the sum of all the possible aspects of an aircraft. Hence, it will depend on fuel weight, crew and payload weight and also on empty weight.
Correct Answer : Option (D) : 2157lb
Explanation : Given crew and payload = 180kg,Empty weight fraction We / W0 = 0.48Fuel weight is 0.7 times empty weight.Hence, Wf = 0.7*WeHence, Wf / W0 = 0.7*We / W0 = 0.7*0.48 = 0.336Gross weight of aircraft is,W0 = Wcrew + Wpayload + Wfuel + WemptyBy re-arranging,W0 = Wcrew + Wpayload / [1 – (Wf/ W0) – (We / W0)] = 180 / [1-0.336-0.48] = 978.26kg = 2157.06lb.
