Aerial platform controls include two control stations; the lower control station shall be capable of overriding platform controls and both stations are operable at either location.

• A. The platform controls and lower control station operate independently and cannot override each other.
• B. There are two control stations but the lower control cannot override the platform controls.
• C. The lower control station must be located on the platform.
• D. The lower control station shall be capable of overriding platform station controls; both stations are operable at both locations.

Answer: (D)

The key idea is safe, flexible control of the aerial platform through redundancy with an override capability. The lower control station must be able to override the platform’s own controls, so if commands from the platform could create unsafe motion or conflict, the operator at the lower station can take precedence and bring the system under safe control. At the same time, both control stations being operable at both locations means you can operate the platform from either place—whether you’re at the base or on the platform—providing reliable control during setup, operations, or in an emergency. Other descriptions that omit the override capability or limit where stations can operate fail to ensure safe and versatile control in real-world use.