Prior To Takeoff - Takeoffs And Departure Climb

Before taxiing onto the runway or takeoff area, the
pilot should ensure that the engine is operating properly and that all controls, including flaps and trim tabs,
are set in accordance with the before takeoff checklist.
In addition, the pilot must make certain that the
approach and takeoff paths are clear of other aircraft.
At uncontrolled airports, pilots should announce their
intentions on the common traffic advisory frequency
(CTAF) assigned to that airport. When operating from
an airport with an operating control tower, pilots must
contact the tower operator and receive a takeoff clearance before taxiing onto the active runway.

It is not recommended to take off immediately behind
another aircraft, particularly large, heavily loaded
transport airplanes, because of the wake turbulence
that is generated.

While taxiing onto the runway, the pilot can select
ground reference points that are aligned with the
runway direction as aids to maintaining directional
control during the takeoff. These may be runway
centerline markings, runway lighting, distant trees,
towers, buildings, or mountain peaks.