PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010
Page 3-7
Rev. 29, Sept. 2021
In a standard dual installation, the pilot and copilot can select TEL (Com 5) mode independently by press-
ing their respective COM5 Xmt button. The passengers are on the phone only when the pilot has selected
Com 5 mode and his ICS mode switch is in the ALL position.
The copilot cannot put the passengers on the phone, and the passengers can only get on the phone when the
pilot is on the phone.
In an observer dual installation, the crew box works like a single installation. The observer is treated like a
passenger, so he would be on the phone line when COM5 Xmt is selected and the intercom switch is in
ALL mode. The observer cannot select telephone mode independently. The observer is on the phone if the
crew system is in ALL and the observer is not in ISO.
Note: Because the cell phone uses an intercom circuit, all stations on that circuit will lose
intercom capability when the cell phone is in use.