Which cockpit lighting can only be turned on from the trim control panel?

The correct answer is that the flood lights can only be turned on from the trim control panel in the T-6B cockpit. This is because the design and functionality of the cockpit lighting systems prioritize operational efficiency and ease of access for crucial controls.

The flood lights serve a specific purpose, primarily illuminating the cockpit area to enhance visibility for the pilot during low-light conditions, such as night flying or when operating in a confined space. By locating the control for the flood lights on the trim control panel, the T-6B design ensures that the pilot can manage these lights without diverting attention away from critical flight controls or instruments, which is essential for maintaining situational awareness.

Other lighting systems in the T-6B, such as landing lights, knee board lights, and NAV lights, are designed to be activated from different controls or panels, contributing to a more intuitive operational layout. This separation allows pilots to use various lighting systems depending on the specific flight phase without inadvertently activating systems that are not needed at that moment.