Takeoff And Landing On Sloped Fields - Kazan Helicopters Mi-17-1V Flight Manual

MI<-17-1B. Flight manual
not less than 10 m.
(15) The highland fields have inadequate strength of the ground in most
cases. After landing on such fields the helicopter wheels sink, the
helicopter tilts and may turn over.
When landing on such fields decrease the main rotor collective pitch
down to the minimum limit only after preliminary inspection of the ground
condition on the selected field by the Flight Engineer and on his visual
commands.
If tendency of the helicopter tilting is detected, lift off the helicopter and
select another landing area within the selected field and shift the helicop-
ter to this area by hopping at a height of 1 to 2m. Taxiing on such fields is
unsafe and may cause turnover of the helicopter.
(16) During prolonged hovering (manoeuvering) near the ground at over zero
ambient temperatures and, particularly in tailwind, the engine and main
gearbox oil temperatures may rise up to the maximum limits.
If these limits are reached, land the helicopter and shut down the engines
for the purpose of cooling the engines and gearbox.
(17) When performing approach for lowering the external load decelerate the
helicopter well in advance. The deceleration distance in approach to a high-
land field increases 1.5 to 2 times as compared with the deceleration distance
in lowland. An attempt to increase the deceleration rate leads to complication
of piloting technique and causes swinging of the external load.
4.22.2. Takeoff and Landing on Sloped Fields
(1) The highland fields nearly always have slopes of various steepness.
The maximum slopes of fields used for vertical takeoff and landing with-
out shutdown of the engine are listed below:
7° for the uphill headed position.
5° for the downhill headed position.
T"
for the LH side uphill position.
3° for the RH side uphill position.
The maximum slopes of fields used for vertical takeoff and landing with
shutdown of the engines after touchdown are listed below:
3° for the uphill and downhill headed positions, and LHside uphill
position.
3° for the RH side uphill position.
The fields should have hard surfaces precluding sinking of the LG
wheels.
(2) It is allowed to execute vertical takeoffs and landings on the sloped fields
at wind up to 5 m/s disregarding the helicopter position relative to the
wind, in wind above 5 m/s it Is allowed to execute these manoeuvres only
into the wind with the maximum allowed limits of slopes taken into con-
sideration.
Execute takeoff and landings on the sloped fields with the helicopter nose
or LH side uphill, where possible. ..
The most safe are takeoff and landing with the helicopter headed uphill.
(3) When hovering over a sloped field the helicopter shows a tendency to
shift downhill which should be counteracted by application of the control
stick in the direction opposite to shift. This feature results in a helicopter
banked uphill attitude in hovering across the slope of the field, the angle
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