Navigation; Initial Waypoint Approach - Kazan Helicopters Mi-17-1V Flight Manual

M",·17·1B. Flight manual
the .Qlt1CC-15 doppler system hovering indicator.
If the ground reference object is lost immediately proceed to go around
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ence object by shifting the helicopter near the ground with the horizontal
and vertical visibility nil is forbidden.
(14) At running landing in headwind less than 5 mls touch down at a speed of
30 to 50 kmlh depending on the field length. If horizontal visibility deterio-
rates before landing immediately accelerate the helicopter and go
around. During repeated approach the touchdown speed should be a bit
higher than during previous approach. After touchdown decrease the
main rotor collective pitch down to the minimum level, retard the throttle
control twist grip and apply the LG wheel brakes.
It is necessary to bear in mind that braking on a field covered with snow
may cause skidding of braked wheels.
Note: The engine dust protection devices do not provide 100 per cent
cleaning of air supplied to the engines. Therefore it is desirable,
where possible, to avoid operation of the helicopter on sand or
dusty fields without previous watering of the field surface.
4.24. Navigation
(1) In the course of preflight preparation the crew must do the following:
(a) Obtain refined weather data.
(b) Obtain refined flight data for the route segments and selected alti-
tudes with actual wind data accounted for.
(c) Perform preflight check of the helicopter flight, navigation and air
delivery equipment.
(d) Set precise time to the aircraft clock.
4.24.1. Initial Waypoint Approach
(1) To approach the initial waypoint (IWPT) select a manoeuvre to approach
the initial waypoint on a heading close to the desired magnetic track an-
gie (DSRMTK) proceeding from the conditions of flight (such as take-off
heading, altitude, distance to the initial INaypoint,etc.).
(2) Depending on actual navigation situation approach the initial waypoint
observing landmarks, referring to the .Qlt1CC-15 doppier system, using the
course and time data calculated from known wind, the ground radio
means and the air control center information.
(3) When passing over the initial waypoint refer to the yrp-4YK (or nHn-72-
15) compass system indicator bo bring the helicopter on a course with
the drift angle accounted for to fly the desired track to the point of
destination (target) or a next waypoint (IWPT), depress the OFF-ON
(OTKJl-BKJl) key on the co-ordinate indicator to start reckoning of co-
ordinates, start the stopwatch· ahd hote· the time of· the ihitial waypoirit
flyover on the chart.
(4) When f1yihg along a route with great number of turns it is advisable to use
the compass system in the magnetic slaved mode (MAG). In this case it
is not recommended to use the compass system slavinq selector "CRS
SELECT" for determining the heading since oscillations of the flux-gate
detector during slaving may cause an error.
Slave the system before taxiing out of the parking area and again on the
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