Excerpt from Aeroplane Construction and Assembly

An aeroplane is designed to withstand the strains put upon it by the work which it is called upon to do.

It is a machine of accurate yet delicate construction and great care must be taken that no undue strains are put upon it. An aeroplane rigger must necessarily have a fine conception of where any heavy strains may be placed upon it without causing distortion or breakages to its structural parts.

To the average layman, an aeroplane is a solid mechanical structure, and he has no preference in lifting any part of it, other than that of convenience. Some machines are marked with ar rows denoting the points at which loads may be applied, but it is necessary for any aeroplane rigger to have a thorough knowledge of all these points and the reasons why loads may be applied at same. Frequently the machines have no load marks whatever and the aviation mechanic must naturally use his own judgment.

In climbing into the passenger's or pilot's seat, care must be taken not to place any weight on the trailing edge or unsupported fabric of the plane. There is a reenforced section called the sidewalk on the wing next to the fuselage generally covered with corrugated rubber, upon which the weight may be placed. There is also a step in the side of the fuselage.

In turning a machine around by hand, it is necessary to lift the tail post off the ground. In doing this, care must be taken to apply the lift under the load points. These points are the inter section points of the fuselage struts with the longerons and If not marked their positions must be determined before an attempt is made to raise the tail.

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