Before checking the position and angle of the main components on aircraft?

What should a mechanic do before checking the position and angle of the main components on any type of aircraft?

It’s related to a longitudinal datum line parallel to the aircraft center line and a lateral datum line parallel to a line joining the wing tips. So, before checking that the aircraft must be jacked and leveled.

Reference: FAA-8083-31 Volume-1, Page: 2-48

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