Clock
Serves the same function as the CHR button for the associated Clock.

Panel
Turn on and control intensity of integral lighting in the associated pilot's Instrument Panel. Captain's knob also controls Center main panel, Standby Magnetic Compass and first observer side panel integral lighting.

Chart
Turn on and control intensity of associated pilot's Chart light.

Flood
Turn on and control intensity of associated pilot's main panel Flood lights. Captain's knob also controls Center main panel Flood lights.

Map
Turn on and control intensity of associated pilot's ceiling-mounted Map light.

PTT Switch
Key transmitter selected with the microphone selector switches on the associated Audio control panel.