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5-44
PM-121
Original
Learjet 31A
Pilot's Mamal
AUDIO CONTROL SYSTEM
The audio control system is used to select the desired audio inputs for
broadcast through the speakers or headphones. The audio control system
is also used to select the desired transmitter to which microphone
inputs will be directed . A separate audio control system is provided
for pilot and copilot. Each system consists of an audio amplifier and
audio control panel. The audio control system operates on 28 VDC
supplied through the 5-amp L and R AUDIO circuit breakers on the
pilot's and copilot's circuit breaker panels respectively. The audio
control systems will operate during EMER BUSmode.
AUDIO CONTROL PANEL
An audio control panel is installed at the outboard end of the pilot's
and copilot's instrument panels . Each panel provides the controls necessary
to direct audio signals and adjust volume levels. Each panel is
used in conjunction with the on-side microphone, headphone and
cockpit speaker.
TRANSMIT SELECT SWITCH
The TRANSMTr SELECT Switch is a multi-position rotary-type
switch labeled VHF l, VHF 2, HF and PASS SPKR This switch provides
the proper microphone audio inputs for the respective functions.
VHF 1, VHF 2, and BY Positions -When any of these positions are
selected, microphone inputs are provided for the respective transceiver.
Microphone must be keyed to transmit.
PASS SPKR Position - When this position is selected, the pilot or
copilot, utilizing this function, may speak to the passengers through
the passenger speaker. Microphone must be keyed to transmit. PASS
SPKR should not be selected on both audio control panels simultaneously
as degradation of the volume level mayresult .
PM-121
5- 45
Change l
Pilot's Manual
Learjet 31A
MIC SELECT SWITCH
NORM Position -When the switch is in this position, voice transmissions
are accomplished with the headset microphone or handheld
microphone.
OXY Position -When the switch is in this position, voice transmissions
are accomplished with the oxygen mask microphone. Both cockpit
speakers, phone and interphone function (see MDCERSWITCHES)
will be active . Themicrophone must be keyed to transmit to the passengers
or via a communications radio.
VOLUME CONTROLS
MASTER VOL-This control regulates the volume level of all audio
outputs.
PASS VOL-This control regulates the volume level of the passenger
speaker audio.
SPEAKER SWITCH
Speaker Off Position -When the switch is pushed in and any mixer
switch is on, audio is fed to the on-side headphones only. Rotating the
knob will adjust the volume level to the headphones.
Speaker On Position-When the switch is pulled out and any mixer
switch is on, audio is fed to the on-side headphones and on-side cockpit
speaker. Rotating the knob will adjust the volume level to the
headphones and cockpit speaker. The On (pulled) position is indicated
as follows:
" During daylight-A white ring on the switch stem will be exposed.
" During darkness -The switch will be illuminated.
5-46
PM-121
Change l
Learjet 31A
Pilot's Manual
MIXER SWITCHES
All mixer switches have a volume control which is rotated to
the volume level of individual audio inputs . The On (pulled) position
of each mixer switch is indicated as follows:
" During daylight -A white ring on the switch stem will be exposed.
" During darkness-The switch will be illuminated.
Mixer switches on the audio control panel are labeled and perform
the following functions:
VHF 1 and VHF 2 Switches -When in the On (pulled) position,
provide audio from theVHF 1 andVHF2 transceivers respectively.
BY Switch-When in the On (pulled) position, provides audio from
HF transceiver (if installed).
INPH Switch - When in the On (pulled) position, provides audio
from the interphone. The interphone employs a voice activated hot
microphone.
NAV 1 and NAV 2 Switches - When in the On (pulled) position,
provide audio from theNAV 1 and NAV2 receivers respectively.
ADF 1 and ADF2Switches-When in theOn (pulled) position, provide
audio from the ADF 1 and ADF2 (if installed) receivers respectively.
MKR 1 and MKR 2 Switches -When in the On (pulled) position,
provide "marker" audio from the MKR 1 andMKR2 receivers respectively.
DME 1 and DME 2 Switches - When in the On (pulled) position,
provide audio identification signals from the DME receiver(s). DME 1
switch controls audio for the DME channel tuned by the NAV 1 receiver
and DME 2 switch controls audio for the DME channel tuned
by the NAV 2 receiver.
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