PRIMUS
r
1000 Integrated Avionics System
A28--1146--112--00
PRIMUS
â
II Radio System
C--38
D
Transmit (TX) Annunciator
-- This annunciator indicates when the
copilot’s COM transmitter is transmitting.
D
NAV AUDIO On/Off Switch
-- This alternate action button is used
to toggle NAV audio on or off to the audio panel in in the EMER
mode.
D
Squelch On/Off Switch
-- This alternate action button is used to
toggle COM squelch on or off.
D
Norm/Emergency MODES Switch
-- This rotary switch knob
selects the normal and emergency modes.
D
Transfer Key (
Y
y
B
)
-- The transfer key alternately selects either the
COM frequency (top) or the NAV frequency (bottom) to be
connected to the tuning knobs.
D
Radio Tuning Annunciators
-- These four annunciations are lit
individually to identify source of the frequencies on the top and
bottom lines.
D
System Installation Annunciator (2)
-- Annunciates the radio
system to which the tuning backup control head is connected. For
the Embraer 145, aircraft wiring selects the No. 2 radio system.