TM 55-1510-220-10
or the autopilot may be coupled to the VOR system, accepting
VOR inputs to the autopilot computer. The pilot's unit (VOR
1) is a navigation radio system which receives and interprets
VHF omnidirectional radio range (VOR) and localizer (LOC)
signals, glideslope signals (GS), and marker beacon signals.
It has a maximum range of 120 nautical miles line-of-sight.
The system operates in a VOR/LOC frequency range of
108.00 to 117.95 megahertz in a glideslope frequency range
of 329.15 to 335.00 megahertz, and at a marker beacon
frequency of 75 megahertz. VOR 2 is similar to VOR I
except VOR 2 cannot receive or interpret marker beacon
signals. Each VOR system provides course deviation and
glide path data, which can be switched either to the copilot's
HSI or to the autopilot flight computer and * pilot's HSI. The
audio outputs of VOR I and VOR 2 systems are supplied to
the NAV control on the audio control panels. VOR I bearing
data is supplied to the single-needle pointer on both radio
magnetic indicators. VOR 2 bearing data is supplied to the
double-needle pointer on both radio magnetic indicators.
VOR I uses a marker beacon antenna located on the
underside of the forward fuselage (fig. 2-1). VOR I and VOR
2 both use the same glideslope antenna, located inside the
radome. Both VOR's are protected by separate 2-ampere
circuit breakers, located respectively on the number 1 and
number 2 avionics buses. The circuit breakers are placarded
VOR No. I and VOR No. 2 are located on the overhead
circuit breaker panel (fig. 2-27).
b.
Controls/Indicators and Functions, NA V I1 Control
Panel.
(1)
Frequency indicator. Displays selected
frequency of VOR 1 receiver.
(2)
Frequency
control
Selects
operating
frequency of VOR 1 receiver.
(3)
VOL-OFF control. Activates VOR 1 receiver.
Permits monitoring VOR 1 audio and adjusts volume of
signals received.
(4)
NAV-TEST switch. Activates test of VOR I
navigation system. If the system is functioning properly, the
following indications are presented if tuned to VOR
frequency.
(5)
RMI. Single-needle indicates approximately
0'.
(6)
HSI. Lateral deviation bar will center if arrow
is set for 0', and NAV 1 is tuned to a localizer frequency.
c.
Controls/Indicators and Functions, NA V2 Control
Panel.
(1)
VOL-OFF control. Activates VOR 2 receiver.
Permits monitoring VOR 2 audio and adjusts volume of
signals received.
(2)
Frequency
control.
Selects
operating
frequency of VOR 2 receiver.
(3)
Frequency indicator. Displays selected
frequency of VOR 2 receiver.
(4)
NAV-TEST switch. Activates test of VOR 2
navigation systems. If the system is functioning properly the
following indications will be presented:
(5)
RMI. Single-needle indicates approximately
0°.
(6)
HSI. Lateral deviation bar approximately
centers if course arrow is set to 0°, and NAV 1 is tuned to a
localizer frequency.
d.
Controls and functions.
(1)
Pilot's COURSE INDICATOR switch. Selects
receiver to control pilot's HSI
(a)
VOR 1. VOR I controls pilot's HSI.
(b)
VOR 2. VOR 2 controls pilot's HSI.
(c)
TACAN. TACAN controls pilot's
(d)
INS. INS controls pilot's HSI.
(2)
Copilot's COURSE INDICATOR switch.
Selects receiver to control copilot's HSI.
(a)
VOR 1. VOR 1 controls copilot's HSI.
(b)
VOR 2. VOR 2 controls copilot's HSI.
(c)
TACAN. TACAN controls copilot's
HSI.
(d)
INS. INS controls copilot's HSI.
e.
VOR Operation.
(1)
Turn-on procedure:
1.
Insure that aircraft DC and AC power
is on.
2.
Avionics
master
power
switch
(overhead control panel, fig. 2-12) ON.
Change 2
3-30
