Yak 18T - 9.3 Recovery from an Inverted Spin; 9.4 Unintentional Snap or Fall into Spin

Yak 18T Flight Operations Manual
Page 53 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.
• for getting the aircraft out of the spin, DEFLECT the rudder vigorously and FULLY
against the spin and in 3 seconds after the rudder kick, move the yoke fully
FORWARD. A LAG, when this is done, can be equal to 1-1.5 turn at the left spin
and 2-2.5 turns at the right one (The LAG during spin recovery is counted from the
moment the elevator is applied)
• the aircraft recovers in a dive that is almost vertical when the rotation comes to an
end, SET pedals to the NEUTRAL position and at acceleration of 3-4 recover the
aircraft from a dive not allowing the IAS to exceed by more than 300km/h
9.3. Recovery from an Inverted Spin
The Yak 18T is PROHIBITED
from inverted spin training and practice flights.
• The aircraft's inverted spin is STEEPER than the normal spin. It is NOT DIFFICULT to
RECOVER
• This is done with a full and vigorous rudder pedal DEFLECTION towards the side
OPPOSITE to the spin direction
• With a subsequent 1-2 second DELAY, deviate the yoke BACKWARDS beyond the
NEUTRAL position (by ¼-1/5
th
motion). The LAG experienced during recovery from the
inverted spin is at LEAST 1 turn
9.4. Unintentional Snap or Fall into Spin
The spontaneous fall into a spin can ONLY occur as a result of GROSS PILOTING
ERRORS.
While training or in flying practice it is PROHIBITED
to perform a fall into a spin from
VERTICAL manoeuvres (i.e. zoom, loop, half-loop and combat turn).
Inadvertent entry into a spin from a 360° turn or spiral towards the side opposite to the
bank is PROHIBITED
.
• A spin CAN occur when making steep climbs, loops, half-loops and combat turns; usually
when the yoke is pulled backwards and simultaneously the rudder (pedal) is fully
deflected aside. With the controls in such as position the aircraft first rolls and then
drops the nose and goes into a spin
• In ALL cases of a spontaneous fall into a spin, REMOVE the boost IMMEDIATELY
• SET the aileron to the NEUTRAL position and determine the spin direction
• RECOVER the aircraft from the spin by using one of the methods mentioned above
• During training, to teach manoeuvring in order to CORRECT “errors”, an inadvertent
entry into a spin is ALLOWED only from a descent turn (spiral) with the engine fully
UNBOOSTED. To perform an inadvertent entry into the descent turn spin –
• when the IAS is 150-170km/h the aircraft is rolled into 50-60° banked turn
• during the turn, PULL the yoke backward and simultaneously FULLY deflect the
rudder pedal (against the stop) TOWARDS the turn
• the aircraft will vigorously ENTER into the spin