Kazan Helicopters Mi-17-1V Flight Manual page 108

M,,·17·1B. Flight manual
(6) Derive the helicopter maximum weight for vertical takeoff and landing
with hovering in and out of ground effect, as well as for running take-off
.... n ri II"Ir'lNin" f,.,.."", fh.o ,...r~nhC' in t:'inco 1 1 ~nrl 1 ~
0:;.1;1' 1C,.411
11I~
IIVIlI Ul
:::f,
!""' " . '::1 "
1...- .
(7) The helicopter can be used for selection of landing fields in mountains by
aerial reconnaissance preceded by study of the mountain geological relief
on the large-scale charts. In selection of the landing fields place particular
emphasis on the field clearways, presence of obstacles, slope, wind
speed and direction.
To determine these elements of highland fields of limited dimensions and
complex clearways execute preliminary flyover of the field at a height of
20 to 30 m and an airspeed of 60 to 70 km/h.
To determine the wind direction give an order to the Flight Engineer to
drop a smoke pot at the moment of passing over the field.
(8) Sharp and frequent changes of wind direction and speed is noted during
flying over highland areas, therefore, execute landing approach immedi-
ately after determination of wind direction by observing smoke from the
pot.
(9) Select the landing approach procedure according to the specific condi-
tions. Fly rectangular approach pattern or execute two 180-degree turns
at an airspeed of 100 to 120 km/h.
Execute final turn at a distance not less than 1.5 km from the selected
field threshold.
Execute landing approach in such a way as to be capable of veering off
and go-around, if it proves impossible to hover at a safe height over the
field.
(10) When landing on field located in mountains at elevations exceeding 500
m above sea level the helicopter shows lagging response to application
of the control stick in fore-and-aft direction and to increasing the collective
pitch in order to reduce the forward and vertical speeds of descent during
deceleration preceding touchdown. At these altitudes the helicopter per-
formance in deceleration deteriorates, it becomes more sluggish in rela-
tion to its behaviour during deceleration over the fields located at altitudes
near to sea level.
(11) ThedistancereqLiited for sloWing doWn of the forward speed, and
height required for slowing down of the vertical speed of descent in-
crease. Therefore it is necessary to proceed to deceleration earlier than
during landing approach to a field located at sea level. Movements of the
control stick and the collective pitch control lever should be smooth and
co-ordinated.
(12) Vigorous pitching up of the helicopter in the course of deceleration pre-
ceding touchdown causes settling in of the helicopter. Moreover, consid-
erable pitching up impairs visibility of the landing area and, therefore,
makes accurate aiming at this area more difficult.
(13) Execute deceleration before hovering in ground effect in such a way that
by the moment the selected field threshold is reached the height does not
exceed 2 to 3 m and the speed is within the limits of 5 to 10 km/h.
Hover over the center of the field as possible, and thereafter select the
touchdown area and assess the surface fitness for landing.
Approach the selected touchdown area at a speed of 5 to 10 km/h.
(14) During landing approach to a field having obstacles at its inlet boundary
below the landing approach path, pass the obstacles having a clearance
4-37