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use VHF 2 and hear NAV 2 without volume control.
1-2-INPH SELECTOR SWITCH ^
Used for two-way communication, to select VHF 1
radio, VHF 2 radio, or interphone. Each radio must
first be switched on independently.
1 or 2—The headphones, microphone and press-totransmit
switches function with the selected radio.
Pilot can hear inputs from radios selected by monitor
switches and can hear interphone but not talk on it.
INPH—Pilot can use interphone and can hear inputs
from radios selected by monitor switches. He talks
and listens to all stations using interphone, without
selection. Press-to-transmit not used. No radio
transmission.
Pilot's or Copilot's Audio Control Unit SECTION 6
Figure 2 Page 3
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OPERATING MANUAL
NOTE
No controls on the unit. Operator talks and listens to all stations that are using the
interphone. Although units are for use on the ground, interphone is functionally
complete in the air, except that the microphone circuits of the nose wheel and APU
stations are disconnected.
Ground Crew Interphone Unit SECTION 6
Figure 3 Page 4
May 28/82
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OPERATING MANUAL
D. Ground Crew Interphone Unit (Figure 3)
Ground crew interphone units consisting of headphones and microphone jacks
are installed in the nose wheel well, in the radio rack (underfloor) and at
the APU station (rear equipment compartment).
E. YHF Communication Radio Components
The YHF radios are referred to as YHF 1 and VHF 2, and as COMM 1 and
COMM 2.
F. Radio Control Units (Figures 4 and 5)
The radio control units are mounted on the centre pedestal in the flight
compartment. One unit carries controls and digital displays for COMM 1 and
the other unit is divided between COMM 2 and NAV-2 controls and displays.
COMM 1 unit i s on the copilot's side and COMM 2/NAV-2 on the p i l o t s side.
3. POWER SUPPLY
The communication systems are powered by 28 volts dc, through the following
circuit breakers:
On the battery bus circuit breaker panel - right:
VHF N0.1
INTERCOM NO. 1
INTERCOM NO. 2
On the main bus No. 2 circuit breaker panel:
VHF NO. 2.
The VHF radio circuit breakers route power to the respective radio
transceivers.
The INTERCOM NO. 1 and NO. 2 circuit breakers route power respectively to
the pilot's and copilot's channels in the audio electronics unit.
SECTION 6
Page 5
May 28/82
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OPERATING MANUAL
TEST BUTTON
When pressed, receiver background
noise is audible.
FREQUENCY DISPLAY WINDOWS
Display frequency in megahertz. Sixth
digit (0 or 5) is not shown.
SELECT BUTTONS
Pressed to select left or right
frequency display. Green light
comes on when associated
display is in use.
VOLUME CONTROL
Switches radio on when turned out of
detent; increases volume when turned
clockwise.
Green light is on and dial lights
are on when the radio is on.
NOTE
FREQUENCY SELECTORS
Outer knobs select frequency in single
megahertz increments; inner knobs select in
25-kHz increments.
Emergency operation: if power fails in the pilot's channel of the audio electronics
unit, the pilot can still use VHF 1, but the COMM-1 volume control does not
function.
VHF 1 Radio Controls
Figure 4
SECTION 6
Page 6
May 28/82
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OPERATING MANUAL
4 . EMERGENCY OPERATION
A. Pilot's Station
I f power from INTERCOM NO. 1 circuit breaker fails or i f the pilot's
channel power circuit in the audio electronics unit fails, the pilot loses
all audio facilities except aural warning and the use of COMM 1 and NAY-1
radios without volume control.
NOTE: After failure of one channel in the audio electronics unit, the
communication and VOR navigation radio facilities available to the
pilot on the intercom are those normally used by the copilot.
B. Copilot's Station
I f power from INTERCOM NO. 2 circuit breaker fails or i f the copilot's
channel power circuit in the audio electronics unit fails, the copilot
loses all audio facilities except aural warning and the use of COMM 2 and
NAV-2 radios without volume control.
C. Ground Crew Interphone Stations
During emergency operation of the pilot's channel, power to the headphone
circuits of the nose wheel well and APU stations is off. During emergency
operation of the copilot's channel, power to the headphone circuit of the
radio rack station is off.
SECTION 6
Page 7
May 28/82
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