What is the primary purpose of the Inertia Reel Lock?

The primary purpose of the Inertia Reel Lock is to prevent the incapacitated pilot from falling into flight controls. This safety mechanism ensures that in the event of sudden deceleration or a crash, the pilot's seatbelt will lock in place, restraining movement and allowing the pilot to maintain control of the aircraft as much as possible. This function is particularly important in maintaining the integrity of flight control during critical moments, such as turbulence or emergency situations, thereby enhancing overall flight safety.

The other potential functions mentioned in the choices do not align with the specific design and purpose of the Inertia Reel Lock, which is primarily focused on passenger and pilot safety during in-flight incidents.