Question

A jet airliner aircraft is flying with crew load of 150kg, payload of 520lb and fuel weight of 500lb. Find out the empty weight if design take-off gross weight of the aircraft is given 1525lb.

(a) 79kg

(b) 79lb

(c) 170lb

(d) 355lb

I got this question during a job interview.

My doubt is from Conceptual Sketch Sizing in portion Conceptual Sketch Sizing of Aircraft Design

Answer 1

Right answer is (a) 79kg

To explain I would say: Given,

Design take-off gross weight, W0 = 1525lb

Crew load = 150kg = 150*2.205lb = 330.693lb

Payload weight = 520lb, fuel weight = 500lb

Now the design take – off gross weight is given by,

W0 = Wcrew + Wpayload + Wfuel + Wempty

1525 = 330.693 + 520 + 500 + Wempty

So, Wempty = 174.307lb = 79 kg.