Yak 18T Flight Operations Manual
Page 52 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.
•
At the first 3-tum spins the angle of longitudinal inclination is gradually
DECREASED
and
angular rotational velocity rises at a constant speed and acceleration (n
y
=2). After 3-4
turns the aircraft spin becomes
STABLE
with slight rolling oscillations, constant speed
and acceleration
•
At the first 3 turns there is no actual
DIFFERENCE
between the left and the right spins.
After 3-4 turns the
RIGHT SPIN IS MORE
sloping than the left. Rotation during both
spins is accompanied with some aircraft stalling
VIBRATION
or
BUFFETING
•
While spinning, direct a glance towards the spin direction by
25°-30°
from the air
aircraft X-axis and by
20°-30°
below horizon
9.2. Spin Recovery
To recover the aircraft from a spin, first –
•
DEFLECT
the rudder pedal towards the side opposite to the spin direction and after this
in 2 seconds move the yoke forward beyond a
NEUTRAL
position by ¼-1/5
th
of motion
•
NOTE
: moving the yoke fully forward is not advisable, as this can result in dive angle
increase, appearance of a negative load factor, rising of the indicated airspeeds and a
LOSS OF HEIGHT
during recovery
•
As soon as the aircraft stops its rotation, immediately place the rudder pedals in the
NEUTRAL
position, increase the IAS to
160-170km/hr
and then by
SMOOTHLY
pulling the yoke backwards, recover the aircraft from the dive at such a rate that the IAS
reading at the end of recovery is
220-240km/h
•
When the aircraft
APPROACHES
the horizon, increase the engine boost
•
During three turns of the spin the aircraft's HEIGHT LOSS in recovery is 740m
(approx. 2,400ft)
•
The aircraft recovers from a spin (up to three turns) with a
LAG
not exceeding
ONE
TURN
•
When recovering from a spin, always
DEFLECT
the rudder pedal
AGAINST
the spin
EARLIER
than the elevator. In case of the
REVERSE
sequence the aircraft can
FAIL
to
recover
•
DEFLECTION
of ailerons within up to ½ pro-spin motion does
NOT
affect the spin
nature. At a full pro-spin deflection the spin gets less stable and steeper;
DEFLECTION
of the ailerons by ½ of motion and fully against the spin, the latter becomes more
FLAT
in its nature
•
Influence of the
AILERONS
on the spin nature is felt
MORE
at the
RIGHT
spin than at
the left one
•
While spinning, if the ailerons are
DEFLECTED
against the spin by
MISTAKE
and the
aircraft
FAILS
to recover in two turns of lagging (after pulling the controls for recovery),
proceed as follows -
•
apply pro-spin controls (at the right spin the rudder is fully to the right side, the yoke
is pulled fully backwards, ailerons in the
NEUTRAL
position) check to insure that
they are in
NEUTRAL
•
make one turn with the pro-spin controls
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