Before starting the engine, which action should be taken?

Setting the parking brake and holding the foot pedal brakes before starting the engine is essential for safety and control during the engine start-up process. This action ensures that the aircraft does not move unexpectedly when the engine is started, allowing the pilot to have full control over the aircraft's position.

When the engine starts, it can cause vibrations and sudden thrust that may lead the aircraft to move if the brakes are not engaged effectively. By applying the brakes and ensuring the parking brake is set, the pilot can mitigate any risks associated with unwanted movement, maintaining safety for both the pilot and anyone nearby.

While checking fluid levels, conducting fuel flow checks, and adjusting the throttle are important pre-flight procedures, these actions do not directly prevent movement of the aircraft during engine start. Prioritizing the engaging of foot pedal brakes and the parking brake establishes the necessary control over the aircraft and supports the overall safety protocol before engine operation.