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TM 11-5826-258-24
CHAPTER 2
Section 1. CONTROLS AND INSTRUMENTS
2-2. Operator/Crew Controls
2-1. Damage from Improper Settings
Controls and indicators are illustrated in figure 1-1
No damage results from improper settings.
and identified in table 2-1.
Table 2-1. Operator Controls
NOTE
This table covers only items used by the operator. Items
used by higher category maintenance personnel are covered
in instructions for the appropriate maintenance category
Control,
indicator
Function
or connector
Provides power on/off control for VOR/LOC/GS/MB receiver sections.
NAV VOL-OFF control
Provides VOR/LOC audio output level control.
Provides independent MB audio output level control.
MB VOL-OFF control
Provides on/off control for optional switching of lamp common wire.
108.00 through 117.95 MHz in 50 kHZ steps.
Frequency range selection
Mechanically positions whole MHz wafer switches and units/tenths MHz frequency drums
Whole MHz control (left knob)
simultaneously.
Mechanically positions fractional MHz wafer switches and tenths/hundredths drums
Fractional MHz control (right knob)
simultaneously.
Activates VOR and MB lamp self-test circuits.
VOR/MB TEST control
MB SENS HI-LO control
Provides means of controlling MB sensitivity. (A ground is provided when switch is in HI
position.)
Section II. OPERATION UNDER USUAL CONDITIONS
2-3. Types of Operation
(2) Set the course card (in the illustrated example
205 radial) so that the desired direction of travel
The receiving set may be used as a VOR receiver or an
away from the VOR station is beneath the course in-
ILS receiver. The desired type of operation is selected
dex.
by tuning the receiving set to the frequency corre-
(3) Fly generally toward the destination. When
sponding to that operation: ILS operation is selected
by tuning to the odd tenth-MHz frequencies between
the to/from indicator indicates FR, fly in the direction
which centers the VOR/localizer needle.
108.00 and 112.00 MHz. VOR operation is selected by
(4) When the VOR/localizer needle is centered, the
tuning to the frequencies between 108.0 and 117.95
MHz, except the odd tenth-MHz between 108.00 and
aircraft is on the line from the station to the destina-
112.0 MHz which are reserved for ILS operation.
tion. By flying in the direction originally determined
and. keeping the VOR/localizer needle centered, the
2-4. Starting Procedure
destination will be reached.
b. Direct Flight to VOR Station.
a. Turn on the aircraft radio equipment primary
(1) To fly directly to a VOR station, tune to the
power.
VOR station and rotate the course card until the
b. Turn the NAV VOL-OFF control past the OFF
to/from indicator indicates TO and the VOR/localizer
detent to the desired audio volume.
needle is centered.
c. Set the control unit to the desired frequency.
(2) Fly in the direction read beneath the course
2-5. VOR Operation
index while keeping the VOR/localizer needle cen-
a. Flying From VOR Station. If the direction to a
tered.
c. Flying Selected Inbound Radial.
certain position (fig. 2-1) is known with respect to a
VOR station, that position can be reached as folows:
(1) Tune to the station and rotate the course card
(1) Tune the receiving set to the VOR station fre-
so that the desired course of approach is beneath the
quency.
course index. A TO indication should appear on the
2-1


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