PS Engineering PAC24 Pilot’s Guide - Manual (Page 4)

Page 4 PAC24-Series Pilot Guide
select switch determines who is on the phone:
ISO - pilot,
CREW - pilot and copilot,
ALL - pilot, copilot, passengers
In a standard dual installation, the pilot and copilot can select TEL
mode independently by pressing their respective COM 5 button. The
passengers are on the phone only when the pilot has selected TEL mode
and his switch is in the ALL position. The copilot cannot put the pas-
sengers 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 instal-
lation. The observer is treated like a passenger, so he would be on the
phone line when COM5X is selected and the intercom switch is in ALL
mode. The observer cannot select telephone mode independently.
Stuck Microphone Protection
The PAC24 has a function designed to prevent unintentional radio
transmissions and blocked frequencies. After 35 seconds of continuous
PTT on any input, the PTT line is lifted, and will remain unkeyed until
the PTT input is recycled.
NOTE: Selecting the COM 5 –TEL– mode will disable pilot and copilot
intercom, as the intercom circuit is transferred to the telephone use. In
crew or ISO mode, selecting TEL mode removes the passengers access
to the telephone.
Swap Mode (Remote transfer of com transceivers)
With a yoke mounted, normally open, momentary switch, the pilot can
change from the current Com transceiver another by depressing this
switch. Activating the swap switch will select the next transceiver, cy-
cling from 1 to 2 to 3 etc.
Observer transmit selection (part number –040X).
If the installation uses a dual panel, observer configuration, the crew
panel serves the pilot and copilot, while the second audio panel serves
the observer.
The pilot and copilot have access to all transceivers. The observer can
access any radio that the crew does not have selected for transmit. If the
crew selects a radio for transmit that the observer has previously se-
lected, all parties can transmit, but the pilot, copilot, have priority over
the observer (in that order). If the observer selects a different radio, and
then attempts to re-select a radio in use by the crew, the observer will