Yak 18T Flight Operations Manual
Page 71 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.
•
after take-off and climbing, place the aircraft to the initial route point
•
fly over the departure point on the first route leg course
•
when approaching the intermediate route point, turn the aircraft by a value of the
linear leading a turn to take the next route point course. In such away fly over all
the subsequent route legs
2.
Flight in gyro direction indicator operation mode
For flight in the directional gyro mode, proceed as follows –
•
set the scale of the erecting mechanism to zero
•
set the departure aerodrome latitude on the latitude scale
•
set the operation mode switch to the gyro direction indicator regime
•
on the line-up take-off position, if it is required, set the magnetic heading by using
the heading set switch
From this point on, the compass heading indicator will show the great-circle magnetic
heading relative to the departure aerodrome meridian –
•
fly the aircraft to the first route leg with the great-circle magnetic heading equal to
the great circle magnetic course set minus drift angle
As a result of compass instrument errors, mistakes in the determination of the drift angle and
piloting can occur. The assigned direction can be maintained with a certain angular error,
this can cause a gross track error. To reduce the distance-off-track when tracking the
course, perform the following procedures –
•
check the course by the indicator
•
follow variation of the drift angle
•
control taking the course by other air navigation aids
In flight, in order to maintain the desired course line make the heading correction, if required,
so that the sum of the magnetic heading and drift angle is constantly equal to great-circle
magnetic course set
•
when approaching the next route leg, determine the turn angle by the formula (turn
angle) = (great-circle magnetic course set of the subsequent route leg minus (great-
circle magnetic course set of the subsequent route leg)
If the turn angle (LJP) has a plus sign, then make a turn to the right, if minus -to the left
•
when approaching the landing airfield area (prior to climb), change the compass
system over to the magnetic slaving mode and by using the heading set switch
obtain slaving
•
after slaving the compass system, shift it to the gyro direction indicator mode
NOTE
Monitoring of the compass system working in the gyro direction indicator mode is to be
carried out with the help of the magnetic compass and erecting mechanism.
12.2.3.3
Troubles and failures of the Gyro-magnetic Compass
Trouble, Its Signs, Crew Actions
1. Failure of the gyroscopic
A lamp GYROSCOPE TILTING Use the energetic mechanism
Summary of Contents for 18T
Page 1: ......
