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he desires by using the audio selector switch but without isolation or
speaker operation. The headset must be used in this mode.
B. SPK Switch:
The SPK switch controls use of the speaker or headset. Depressing the
SPK switch connects the speakers to the system (headphones will remain
operational). Releasing the SPK switch (switch extended) disconnects the
speakers from the system.
C. S.T. Switch:
The S.T. switch controls transmitter sidetone. When the S.T. switch is
depressed, sidetone is heard regardless of which pilot makes the
transmission. When the switch is released (extended), no sidetone is
heard.
D. VOL Control Knob:
The volume (VOL) control knob selects an audio level for all receivers
feeding into the audio system and automatically maintains the selected
level on all receivers with one exception: ADF receivers in the unfiltered
position (voice and identifier) are neither automatically level-controlled nor
affected by the VOL knob.
In the filtered position (voice remaining only), ADF receivers are
automatically audio level controlled and under the control of the VOL knob.
The marker receiver, however, is neither automatically level-controlled nor
regulated by the VOL knob. This permits the pilot to detect audio build or
fade as approach to, or departure from, the marker occurs.
E. AUTO Switch:
The AUTO switch enables the auto select feature when depressed. When
depressed, each receiver’s AUDIO is automatically selected when the
receiver’s MICROPHONE switch is selected. When not depressed, each
receiver’s AUDIO and MICROPHONE switch must be selected individually.
F. FILT Switch:
When depressed, the FILT switch filters out or removes the 1020 Hz code
identifier signal of its associated NAV or ADF receiver leaving only the
voice signal. In the released position, identifier and voice are both heard on
OPERATING MANUAL
2A-23-00 PRODUCTION AIRCRAFT SYSTEMS
Page 38
May 30/02
Revision 7
selected receiver.
G. AUDIO Switches:
The NAV1, NAV2, DME1, DME2, VHF1, VHF2, VHF3, HF1, HF2, ADF1,
ADF2, MKR1, MKR2, ILS1 and ILS2 pushbutton switches select their
respective receiver audio when in the depressed position.
H. VHF1, VHF2, VHF3, HF1 and HF2 MICROPHONE Switches:
These switches connect both the hand and boom or hand and mask
microphones to the desired transmitter for communications. Microphone
selection is accomplished by interlocking switches, permitting only one
button at a time to be depressed.
I. H’MIC Switch:
The H’MIC switch is an orange push-push type switch and is not
interlocked with the other MICROPHONE selector switches. When
depressed, the pilot and copilot may communicate on the intercom system
through the boom microphone circuit without depressing the ICS key on
the control yoke. The desired transmitter may remain selected on the
MICROPHONE section while the H’MIC switch remains depressed. In this
configuration, it is only necessary to depress the RADIO key on the control
yoke to make a transmission. Upon releasing the RADIO key, crew
intercom operation immediately returns without further keying. With the
H’MIC switch released, interphone communications between pilot and
copilot will only take place when the ICS button on the control yoke is
depressed.
J. MASK Switch:
The MASK switch is an orange push-push type switch and is not
interlocked with the other MICROPHONE selector switches. When
depressed, the pilot and copilot may communicate on the intercom system
through the mask microphone circuit. The desired transmitter may remain
selected on the MICROPHONE section while the MASK switch remains
depressed.
K. PAGE Switch:
The PAGE switch connects the microphones to the paging system in order
to page personnel or make announcements on the cabin speaker system.
When the PAGE switch is depressed, all audio from the radio receiver to
the cockpit speakers or headphones is silenced to prevent crosstalk or
receiver audio going to the cabin.
L. CABIN Switch:
The CABIN switch connects the audio system to the cabin two-way hand
telephone for communications with the cabin. When the CABIN switch is
depressed, all audio from the radio receiver to the cockpit speakers or
headphones is silenced to prevent crosstalk or receiver audio going to the
cabin.
M. Circuit Breakers:
The audio control / amplifier No. 1 is powered from the 28 Vdc emergency
bus via CKPT AUDIO #1 circuit breaker. The audio control / amplifier No. 2
is powered from the 28 Vdc main bus via CKPT AUDIO #2 circuit breaker.
Both circuit breakers are located on the copilot circuit breaker panel.
　
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