ENGINE RUN-UP

The before takeoff check is a systematic procedure to check our engine, controls, systems, instruments & avionics prior to flight. It may be performed before lining up on an active runway, or in a designated ‘run-up area’ in some airports.

Taxiing to this position usually allows sufficient time for our engine to warm up to at least minimum operating temperatures. This allows the engine oil temperature to reach its minimum value, ensuring adequate lubrication before operating at high power settings.

Before beginning the checklist we position our airplane clear of other aircraft. There should not be anything behind us that might be damaged by the prop blast. To minimise overheat during engine run-up it is recommended that the airplane be headed as nearly as possible into the wind.

After having properly positioned ourselves for run-up, we should roll forward slightly to align our nose wheel. During run-up, the surface underneath us should be firm and free of debris. A smooth, paved, or turf surface is preferred, otherwise the propeller may pick up pebbles, dirt, mud, sand or other loose objects and hurl them backwards. This could damage our propeller and may damage the tail. Small chips in the leading edge of the propeller form ‘stress risers’, or lines of concentrated stress. These are highly undesirable and may lead to cracks and possible propeller blade failure.

While performing the engine run-up, pilots must divide attention inside and outside of the cockpit. If the parking brake slips, or if application of the toe brakes is inadequate for the amount of power applied, we could move forward unnoticed if attention is fixed inside our airplane.