Yak 18T Flight Operations Manual
Page 68 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.
• SWITCH the circuit breakers and radio compass on the power panel on
• SET the switch DIRECTION FINDER OFF on the panel to the PK position
• SET the operation mode switch on the radio compass control panel to the position
AERIAL and the switch to one position or another depending on the operation mode
of the ground radio station
• SET the switch INNER MARKER/OUTER MARKER on the control panel to the on
position, SET the frequency of the inner marker locator with the help of a left decade
tuning knob, listen to call signs and obtain a fine tuning of the radio compass with
the help of the knob TUNING by a maximum deviation of the tuning indicator pointer
to the right
For more accurate tuning, it is advisable to decrease the deviation of the tuning indicator
pointer up to two scale divisions by using the gain control from the control desk and after
tuning is complete, SET the control to the maximum position –
• perform the analogous procedures with the right tuning knob after having SET the
INNER MARKER/OUTER MARKER switch to the on position
• SET the operation mode switch on the radio compass control panel to the COMP
position, in this case a pointer on the radio bearing indicator on the instrument must
indicate the radio bearing of the outer marker locator and the telephone sets calls of
this station should be listened to
• using the LEFT-RIGHT rotatable loop control, deflect the radio bearing indicator
pointer by 45°-60° angle towards the side required
• on releasing the control, make sure that the radio bearing pointer is returned to the
initial position
Make sure that the calls are being listened to correctly and the radio-bearing readings
provided by the direction finder of the inner marker locator are stable.
12.2.3 Radio Compass Usage in Flight
Flight to a Radio Station
During the radio flight, the aircraft heading is SET so that the radio bearing indicator pointer
stays on the indication equal to the drift angle, and the sum of the magnetic heading and
radio bearing is equal to the great-circle magnetic course that is set. If the drift angle is
unknown, then the magnetic course is selected as follows –
• by turning the aircraft, SET the radio bearing indicator pointer to zero and note the
value of the magnetic course
• continue the flight, maintaining the course
• in case of changing the radio bearing by 3°-5° (this indicates the aircraft distance off
track in decreasing the radio bearing to the right, in increasing to the left), perform a
corrective turn of the aircraft towards the side, opposite to the drift and place the
indicator pointer at a value of 6°-10° (350°-354°)
• continue the flight and observe the radio bearing variation
• if the radio bearing's variation continues, increase or decrease the heading correction
by a value equal to a half of the previous correction
• the radio compass locator is marked during the fly-by by turning the radio bearing
indicator 180°
Flight from the Radio Station
If the radio compass locator is available at the departure point or in transit of the course line,
then it can be employed for the preset heading control using the radio compass. The
magnetic heading is selected in this case such that the great-circle magnetic course set is
equal to the aircraft magnetic bearing. For this, proceed as follows –
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