88M Red Book AIT Practice Test

The appropriate hand signal to start the engine during daylight hours is moving a fist in a circular motion at waist level. This signal is universally recognized and clearly communicates to others that the operator intends to start the engine, ensuring safety and coordination among team members and any nearby personnel. By using this specific movement, the operator provides a distinct visual cue that can be easily observed from a distance, fostering an understanding of the actions being taken within the working environment, especially in potentially noisy areas where verbal communication might be challenging. The clarity and simplicity of this gesture make it the standard practice for initiating engine start-up procedures.