Illuminated – Related switch is active.  Press –

• Selects related communication system for subsequent transmission
• Only one switch may be selected at a time; pressing a second switch deselects first switch
• Reception possible over selected system regardless of whether related receiver switch is on.

SELCAL Light, Cabin Call Light, Ground Crew Call Light (C)

Illuminated – Accompanied by chime, alerts crew that communication is desired on indicated communication radio or interphone.   Will automatically reset when microphone is keyed, Control Wheel Mic Switch is pressed or R/T-I/C Switch is positioned to R/T.  Ground Crew Call Light will extinguish when ground crew releases switch.

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