Do not place INSTALLATION switch in the INT ONLY
position when the AM-1780 is connected to a radio system
(3) Turn INSTALLATION SWITCH on the AM-1780 to OTHER.
(4) Intercom only operation is now possible using the control boxes and the
audio accessories connected to them.
(5) TO turn off the AM-1780, place the MAIN PWR and POWER CKT BKR
switches to OFF.
c. Normal Radio and Intercom Operation with Crew Members Control Box. See