Peculiarities Of Helicopter Operation On Fields Covered With Snow (Dust) - Kazan Helicopters Mi-17-1V Flight Manual

M.. -17-1B. Flight manual
strictly in vertical direction avoiding lateral shifts and turns of the helicop-
ter.
During takeoff with the helicopter LH side facing IJphili it experiences a
sharp rolling jerk to the left, and with the helicopter RH side facing uphill -
a sharp jerk to the right, which should be counteracted by an appropriate
motion of the control stick.
(11) During approach to an unknown field bear in mind that it is very difficult to
correctly determine the actual slope by aerial observation. Therefore, dur-
ing landing on a sloped field, disregarding the helicopter position relative
to the slope reduce the collective pitch smoothly, preventing the helicop-
ter banking and slopewise motion by application of the flight controls and
LG wheel brakes.
Warning: If in the course of decreasing the main rotor collective pitch
the cyclic pitch control stick or the directional control pedal
move close to its respective stop, abort landing on this field,
smoothly lift off and land on another field with less slope.
(12) It is allowed to taxi and turn while taxiing on fields with slopes not exceed-
ing 3°. In case of greater slopes move over the field by hopping.
4.23. Peculiarities Of Helicopter Operation On Fields Covered With Snow (Dust)
(1) Flying over fields covered with snow or dust is particularly difficult. Only
the pilots additionally trained for takeoff and landing in these conditions
are authorized to perform such flying.
The helicopter takeoff (landing) weight for takeoff (landing) from (on) a
field covered with snow or dust should not exceed the limit ensuring heli-
copter hovering out of ground effect.
(2) During operation of the helicopter on the fields covered with dust switch
on the dust protection devices after the engines gain the idling speed. To
do so switch on the ENG DUST PROT LEFT-RIGHT
(mY
ABlt1rATEnElI1 nEB. nPAB) selector switches on the right side console
electrical panel. This done, the L DUST PROT ON, R DUST PROT ON
(nEB.
my
BKnI04EH,nPAB.
my
BKnI04EH) annunciators should
come on. Actuation of the dust protection device is accompanied by a
TGT rise by 10 to 15°C and the gas generators sPeeds may increase by
not more then 0.5% from the initial value.
After takeoff and egress from the dusty area switch off the dust protection
devices.
Before proceeding to landing approach to a field covered with dust switch
on the dust protection device. Switch off the dust protection device after
taxiing to the parking area with the engines running at idle.
(3) It is allowed to execute vertical takeoff from and landing on a field cov-
ered with snow provided the snow covering depth does not exceed 50 em
and there is a hard snow blanket on its surface precluding formation of
snow vortex reducing the horizontal and vertical visibility down to zero.
(4) It is allowed to execute taxiing and running takeoff from and landings on
fields with non-rolled snow covering having depth up to 15 em being sure
there are no obstacles under snow.
(5) Hoverings, hops, running takeoff and landings when the horizontal and
vertical visibility is nil are prohibited.
(6) In execution of takeoff from the fields covered with snow, in some condi-
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