Beechcraft C-12C Operator And Technical Reference Manual page 266

TM 1-1510-218-10
(4) GYRO SLAVE / FREE Switch. Controls
system mode of operation.
(a) SLAVE.
mode.
(b) FREE.
mode.
(5) INCREASE
Provides manual fast synchronization for the system.
(a) INCREASE.
output to increase.
(b) DECREASE. Causes gyro heading
output to decrease.
3A-22. VOR RECEIVERS (VIR-30).
a. Description.
provided. VOR No. 2 is identical in operation to VOR
No. 1 except that no marker beacon section is
provided in VOR No. 2. The unit is an airborne
navigation-communications radio whose function is to
receive and interpret VOR and localizer (LOC) signals
in the frequency range of 108.00 to 117.95 MHz,
glideslope signals in the frequency range of 329.15 to
335.00 MHz, and marker beacon signals to 75 MHz.
Signal reception is limited to line-of-sight and by the
power of the transmitter with a maximum range of 120
miles. The VOR receivers are protected by two
2-ampere circuit breakers, placarded VOR # 1 and
VOR # 2, located on the overhead circuit breaker
panel.
b. Associated Controls and Functions. Refer
to Figure 2-17, Sheet 1.
(1) Pilot's VOR 1 / VOR 2 Switch. Controls
course select and display circuits of the pilot's HSI.
(a) VOR 1.
VOR No. 1 receiver.
(b) VOR 2.
VOR No. 2 receiver.
(2) Copilot's VOR 1 / VOR 2 Switch.
Controls course select and display circuits of the
copilot's HSI.
(a) VOR 1.
VOR No. 1 receiver.
(b) VOR 2.
VOR No. 2 receiver.
3A-24
Places system in SLAVE
Places system in FREE
/ DECREASE Switch.
Causes gyro heading
Two VOR receivers are
Circuits are connected to
Circuits are connected to
Circuits are connected to
Circuits are connected to
If the pilot's and copilot's VOR 1 / VOR 2
switches are in the same position, the pilot
has control of the course select circuits of
the selected receiver and the copilot can
only monitor deviation information from
the selected receiver.
indicator will illuminate to notify the copilot
that he has selected the same receiver as
the pilot.
(3) A Indicator.
over airways marker station.
(4) O Indicator.
over outer marker station.
(5) M Indicator.
over middle marker station.
Refer to Figure 3A-1 for items (6), (7), and
(8).
(6) AUDIO VOR Switch. Applies VOR audio
to respective headsets.
(7) MKR BCN HI-LO Switch.
sensitivity of marker beacon receiver.
(8) MKR BCN VOL Control. Adjusts volume
of received signal.
c. Controls and Functions.
3A-14.
(1) Frequency Indicator. Indicates operating
frequency of set.
(2) Frequency Control.
operating frequency.
(3) NAV TEST Push Button. When pressed,
the following indications are presented:
(a) RMI Single needle indicates 5°.
(b) HSI Lateral deviation to the right.
Glideslope deviation down.
(4) VOL / OFF Control. Turns set on and
adjusts volume.
NOTE
A PILOT SELECT
Illuminates when passing
Illuminates when passing
Illuminates when passing
NOTE
Controls
Refer to Figure
Selects desired