The estimation of weight, fuel weight etc. is done by ____ process.

Correct Answer : Option (C) :   planning

Explanation : First order sizing is nothing but a three vie drawing base on initial estimated data. The three vie drawing can highlight vital information such as undercarriage location etc.

Correct Answer : Option (A) :   To provide data for initial layout

Explanation : During the conceptual stage we make a rough sketch called a conceptual sketch. With the help of it we can provide initial estimation of some parameters such as aerodynamics, weight etc. This initial estimation will provide data for the initial layout. Thus, it is called as first order sizing.

Correct Answer : Option (D) :   sizing

Explanation : Sizing is the process to calculate some performance parameters of aircraft. Lofting is modelling of skin. Drafting and drawing are linked together.