Learjet 60 - MIC SELECT Switch; NORM MIC;OXY MIC Switch; Volume Controls

Learjet 60

Pilot's Manual
MIC SELECT SWITCH
The MIC SELECT Switch is a mutt -position rotary-type switch labeled
VHF 1, VHF 2, HF 1,
and
14F 2, and PAR!
This switch
provides
the
proper microphone audio inputs
for the respective functions .
VHF 1, VHF 2, HF 1 and HF 2 Positions - When any of these positions
are selected, microphone inputs are provided for the respective
transceiver . Microphone must be keyed to
transmit
.
PASS 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
should v of be selected on
both audio control panels simultaneously as
degradation of the
volume level may result .
NORM MIC/OXY MIC SWITCH
NORM MIC Position - When the switch is in this position, voice
transmissions are accomplished with the headset microphone or
hand-held microphone .
OXYMIC Position
- When the switch is in this position, voice trans-
missions are accomplished with the oxygen mask microphone . Both
cockpit speakers, phone and interphone function (see VOLUME
CONUROLS) will be active . The microphone must be keyed to transmit
to the passengers or via a communications radio .
VOLUME CONTROLS
The volume controls consist of four MASTER VOLUME (INPH,
PHONE, SPKR and PASS) controls . Each control is rotated
to regulate
the overall volume level
to the applicable output device . The INPH and
SPKR controls have a push-ON/push-OFF function . In the "ON" posi-
tion, the control knob will protrude further than in the "OFF" position .
Also, the controls will illuminate in the "ON" position .
INPH Volume --- This control regulates
the
volume level
of the crew
interphone -system . The interphone employs a voice-activated hot
microphone .
SPKR Volume -This
control
regulates the volume level of the on-side
cockpit speaker audio .
PHONE Volume - This
control regulates the volume level of the
on-side headphone audio .
PASS Volume - This control regulates the volume level of the
passenger speaker audio .
PM-123 $45
Change 4