What is the correct term for the 18 inches extending below and above a landing for an elevator car?

The correct term for the 18 inches extending below and above a landing for an elevator car is the landing zone. This area is critical for ensuring safe and efficient operation of the elevator system. The landing zone is designed to accommodate the elevator car's position when it is at the floor level, providing a buffer for passengers entering and exiting the elevator.

This space is essential for safety, as it allows for some movement in case the car does not align perfectly with the landing. The dimensions of the landing zone are specified to guarantee that there is enough clearance for users, especially those with mobility challenges. Additionally, adhering to the requirements for landing zones helps in complying with safety standards and building codes.

Other terms like inching zone or service zone do not accurately describe this specific area related to elevator landings. The inching zone typically refers to the operational limits of movement control within a close distance to the landings, while the service zone does not specifically pertain to the space needed for safe passenger access. Access zone might suggest areas that are accessible but does not specifically define the important landing parameters for elevator operations.