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Yak 18T Flight Operations Manual
Page 67 of 82
Disclaimer: This manual is to be used as a reference only, it is based on translated Yak 18T Flight Operations
Manuals and has not been approved by the Yakovlev Design Bureau or any other authority.
Section 12 - Operation of Systems and Equipment
12.1 Radio Station
1.
The radio station is located on the instrument panel. The pilot controls this radio station
both from the left or from the right seat
2.
Prior to connection, the controls of the radio station should be
SET
to the following
positions –
•
The radio toggle switch NOISE SUPRESSOR to the OFF position
•
the volume control to the position of maximum volume
3.
To switch the radio station on, proceed as follows –
•
switch on the circuit breakers for the intercommunication system and the VHF on the
switchboard. After two minutes the radio station is operation, receiver noises should
be heard in the earphones
•
set-up the required frequency on the communication channel by using the radio
control panel. To effect transmission, push the button indicated RADIO on the yoke
4.
To switch the noise suppressor off,
SET
the toggle-switch NOISE SUPRESSOR to the
position NOISE SUPRESSOR on the control panel
To switch the radio station off,
SET
the circuit breaker VHF to the OFF position
12.2 Radio Compass
12.2.1 General Information
The radio compass is intended to be used for automatic determination of radio bearings from
radio stations and by air navigation radio compass locators and broadcasting stations, as well
as for pre-landing manoeuvring and approaching.
The operating frequency range of the radio compass is from 150-1300 kHz. Radio coverage
at a flight altitude of 1000m is approximately 160km (100miles). The radio compass is
controlled from a control desk on the instrument panel from the right side and a separate
instrument is used as the relative bearing indicator. Radio compass tuning to two operating
frequencies is provided. For the fine adjustment of the receiver there are two frequency-
setting controls TUNING and TUNING INDICATOR.
The switch INNER MARKER/OUTER MARKER on the instrument panel is for selecting the
required operating frequency in flight and on the ground. An aural presentation of the call
signal in the headphones is given when the switch RADIO COMPASS OFF on the panel of the
intercommunication system is
SET
to the position radio compass. The latter is supplied from
a 27V aircraft d.c. electrical wiring system and from the converter 115V, 400 Hz. Protection
of the power-supply circuits is effected by circuit breakers and the radio compass mounted on
the power panel.
12.2.2 Pre-flight radio compass switching-in, tuning and
checking
To tune and check the radio compass, proceed as follows –
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