Because usually the heated air bypasses the air filter, therefore it is possible for dust to enter the engine and so exposing the engine to unnecessary engine wear.

SOP's are Standard Operating Procedures, they provide safety, uniformity and work ethics.

A line of shortest distance between two points on a sphere.

A free turbine is a turbine that is not directly connected to the compressor. This allows the compressor to rotate at a different speed than the turbine. Since the turbine speed is coupled with the propeller, this allows for the propeller to be maintained at a constant ideal speed.

Another advantage is that free turbine engines can be designed to be more compact than their single shaft counterparts

An aerofoil is a body shaped to produce an aerodynamic reaction (lift) perpendicular to its direction of motion, for a small resistance (drag) force in that plane. It achieves this by accelerating the flow passing over it, and decelerating the flow passing under it. This change in velocity causes a change in pressure, which in turn generates lift.

Decreasing speed, by reducing engine power or pitching up.

From West to East

East to West (In Africa during the summer)

5000 litres

(4 tonnes / 0.8 = 5000 litters)

Downward inclination of a wing from the root to the tip.