Descent; Power-On Vertical Descent; Power-On Glide - Kazan Helicopters Mi-17-1V Flight Manual

MI1-17-1B. Flight manual
more intensive is the speed variation.
Caution: 1.Decrease of the collective pitch at a rate of 1 degls with
simultaneous pitching up of the helicopter at a ratA of
1
degls or more is prohibited due to possible over-speed
of the main rotor beyond the allowable limits.
2.Automatic shutdown of the engines by the free turbine
protection system takes place at a main rotor speed of
113± 2%.
(8) Relieve the forces arising in transient conditions from the flight controls
by momentary depressions of the (3MT-2) trimming button after small
applications of the flight controls.
Notes: 1. Before depressing the trimming button avoid application of great
forces to the control stick or pedals since depression of the
trimming button causes practically immediate release of the
3MT-2 unit and hand (or foot) efforts cause excessive applica-
tion of the flight controls which may lead to swinging of the heli-
copter.
2.lt is not recommended to fly in transient conditions with the
trimming button depressed since this may cause swinging of the
helicopter.
4.8. Descent
Depending on the altitude, power-on vertical descent and descent along
sloped paths (glide) are allowed.
Autorotation descent is allowed only along sloped paths.
4.8.1. Power-on Vertical Descent
(1) Power-on vertical descent from a height of 10 m down to the ground is al-
lowed in all conditions, and from a height of 110m down to a height of
10m is allowed only when it proves impossible to glide due to some ob-
stacles or from tactical considerations. Descent from the service ceiling
down to a height of 110m is allowed in glide at forward speeds according
to Table 2.1.
(2) In vertical descent from a height of 110m down to a height of 10 rn avOid
vertical speeds of descent more than 3 m/s. Execute descent from a
height of 10m down to the ground with the vertical speed of descent con-
tinuously reducing so as it equals to 0.2 mls by the moment of touch-
down.
In case of inadvertent increase of vertical speed of descent reduce it by
smooth increase of the main rotor collective pitch but avoiding exces-
sively high pitches. If, in so doing, the power available proves to be in-
adequate proceed to flight at a forward speed.
In near proximity of the ground execute vertical descent with the helicop-
ter headed into the wind as possible. Assess the verticality of helicopter
path in descent by referencing to the ground reference objects and read-
ing the ,QVlCC-15 Doppler radar.
4.8.2. Power-on Glide
(1) In glide maintain the main rotor speed within the specified limits by
changing the main rotor collective pitch.
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