Attachment Of External Load In Hovering - Kazan Helicopters Mi-17-1V Flight Manual

M..-17-1B. Flight manual
(15) In flight with external load it is recommended to descend along a shal-
lower path with altitude and speed decreasing smoothly and gradually.
Descend down to the deceleration initiation point at a vertical speed not
exceeding 2 to 3 m/s maintaining gliding speed within the limits of 100 to
110 km/h depending on behavior of the external load.
(16) Decelerate the helicopter gradually with the engine power being ad-
vanced smoothly and without significant changes in pitch attitude. Due to
this feature deceleration proves to be more extended in time than in nor-
mal vertical landing and is accompanied by high vibration of the helicop-
ter (from a speed of 70 km/h down to complete transition to hovering).
(17) When reduction of speed (deceleration) is initiated too early, hover with
the external load being short of its point of release (in hovering the exter-
hal load ground clearance should be not less than
3
m) and then shift to
the point of release at a speed of
5
to 10 km/h.
(18) If the pilot did not manage to reduce speed by the moment of approach to
the point of release, abort further deceleration, accelerate up to 100 km/h
lAS without reduction of the engine power and proceed to climb, and
execute repeated approach to the external load release area.
(19) On establishing hovering above the point of release smoothly push the
collective pitch control lever down to reduce the hovering height and bring
the external load in contact with the ground. This done, slacken the ex-
ternal load sling system cables by reducing the hovering height, shift the
helicopter a bit aside from the load so as during release the external load
sling system cable and the extension cable would not fall onto the load,
and depress the external load normal or emergency release button.
Thereafter the SHACKLE OPEN (3AMOK OTKPb!T) annunciator should
come on.
(20) Make sure that the shackle is released (by illumination of the annunciator)
and the external load is released (upon the report of the Flight Engineer)
increase the hovering altitude by 1 to 2m, shift away from the external
load in a selected direction and land.
If the external load is to be released by automatic release of the external
load shackle, before deceleration in the course of landing approach
switch on the AUTO RELEASE (ABTOMAT. C6POC) switch. In this case
the external load shackle will be automatic.,liIyreleased at therl1orl1erit
the external load contacts the ground. But bear in mind that in case of
automatic release of the external load shackle, some items can be dam-
aged by the released cables of the sling system. Therefore, in selection
of the external load release procedure it is necessary to account for the
load nature.
5.6. Attachment of external load in hovering
(1) Establish hovering in close proximity to the external load so as the main
LG wheels-to-ground clearance does not exceed 2 m.
(2) Give to the Flight Engineer an order to unreel the helicopter winch cable
through the cargo compartment floor hatch to pull up the extension cable
and its connection to the ,[If-64 shackle.
(3)
After the hook attached to the helicopter winch cable touches the ground
the ground operator should connect it to the extension cable lug.
On completing the load attachment operations the ground personnel
should go away to a safe area to avoid hitting by the load or the external
load sling system cable if they are released.
5-8