Yak 18T - Figure Eight

Yak 18T Flight Operations Manual
Page 43 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.
• When the specified bank and required angular velocity is achieved, MAINTAIN the bank
by slightly deflecting the yoke to the side opposite to the turn and forwards,
simultaneously
• By pulling the yoke counter-clockwise and by deflecting the rudder pedals, eliminate the
tendency for the aircraft to increase its rotational speed WITHOUT performing any side
slipping
• CHECK the correctness of the turn by using the slip indicator ball and the electrical turn
indicator
• In the course of the banked turn, pulling of the yoke backwards is not allowed because
during such a pulling a slight shaking of the aircraft makes its appearance, when the yoke
is pushed forwards the vibration comes to an end.
• The turn recovery should be initiated 30°-35° before the specified ground reference point
by using coordinated motions of the yoke and pedals, deflecting them to the side
opposite to the aircraft rotation, in so doing, move the yoke forward simultaneously
• Complete the turn recovery by slightly pushing the yoke forwards. When the aircraft
stops its rotation and is pulled out of the roll, SET the yoke to the NEUTRAL position
and recover straight and level flight
• The aircraft should be STABLE throughout the entire process of the steep turn and the
pilot should be able to easily shift from one direction of steep turn to another
8.3 Figure Eight
• BEFORE entry into this manoeuvre, study the surrounding airspace to make sure that no
other aircraft are flying in proximity of your aircraft, that you will remain clear of cloud,
congested areas and that sufficient altitude is available should the manoeuvre is not
successful. Select the necessary ground reference points for completing the manoeuvre
• A figure eight is clearly a combination of two steep 360° turns in the opposite directions
combined by a fast transition turn on crosswind leg to downwind leg
• It can be performed quite easily by following the procedure for the 45° or 60° steep turn.
However, during the reversal procedure it is necessary to push the yoke slightly in order
to hold the speed
• As the banking lessens at the first 360° turn recovery, the engine boost should be
decreased to 480-500mm of Hg and at the entry into the second 360° turn, the boost
becomes complete
• Performing the figure eight manoeuvre requires special attention and a very exact motion
and co-ordination of the control surfaces
• Complete the figure eight manoeuvre recovery by slightly pushing the yoke forwards.
When the aircraft stops its rotation and is pulled out of the roll, SET the yoke to the
NEUTRAL position and recover straight and level flight
• The aircraft should be STABLE throughout the entire process of the manoeuvre and the
pilot should be able to easily shift from one direction of steep turn to another
• A figure eight can be performed at either 45° with an IAS of 180km/h or at 60° with
an IAS of 200km/h.