Yak 18T Flight Operations Manual
Page 45 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.
successful. Select the necessary ground reference points for completing the manoeuvre.
Special attention should be paid to the space above the aircraft
• The steep climb/zoom is performed with a climb ANGLE up to 50°
• Prior to entry into zoom, SET the engine crankshaft speed of 70% (2050 rpm), provide a
full boost and with a small descent increase the airspeed indicator reading up to
280km/h
• Specify a value of the climb angle, fix it and roll from the position of the horizon using the
gyro-horizon instrument
• Proceed with recovery at the IAS of 170km/hr. For this purpose, by means of a
simultaneous rolling into a turn and decreasing climb angle at a constant boost, level the
aircraft out
• The levelling out must be terminated at airspeed indicator reading of 140km/h
8.7 Spiral
• 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.
Special attention should be paid to the space under the aircraft
• Perform the spiral from the steady state glide conditions at IAS of 180km/h with a 45°
roll at the engine IDLING conditions or under the conditions, providing the vertical
descent velocity of 3-4 m/s
• BEFORE entry into the spiral, CHECK the engine instruments and having SET the
designated gliding speed using coordinated motions of the yoke and pedals, roll into a
turn
• When the specified roll has been achieved by slight motions of the rudder pedals and the
yoke towards the side opposite to the turn, ELIMINATE the tendency of the aircraft to
increase its roll by increasing the angular rotational velocity and trajectory speed
• HOLD the bank value according to the nose-over position and the canopy nose sections
relative to the horizon, control it by the turn and slip indicator and by the gyro-horizon
instrument
• The pilots ATTENTION during the spiral must be distributed in the same way as during
steep turns
• Temperature drop of the cylinder heads below 120°C is not allowed. After spiral
recovery SET the glide speed of 170km/h
8.8 Slipping
• Slipping with retracted and extended flap is performed at an IAS of 170km/h
• Prior to slipping, select a ground reference point for direction-keeping, SET up a glide at
the IAS of 170km/h
• Turn the aircraft away from the reference point by 10°-15° and by a smooth moving of
the yoke create a BANK up to 20° towards slipping, holding the aircraft from a turn
using the rudder pedal deflection to the side opposite to the roll
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