Straight-In Teardrop Approach; Flying In Icing Conditions - Kazan Helicopters Mi-17-1V Flight Manual

MI<·17·1B. Flight manual
Fig. 4.7 Straight-In Teardrop Approach
4.21. Flying in icing conditions
(1) Deliberate flying at an ambient temperature below -10°C in icing condi-
tions is forbidden.
(2) At ambient temperatures of +5°C or below execute all flights with the en-
gine and dust protection devices anti-icing system manually switched on,
for this purpose set the ANTI-ICING SYSTEM, ENG DUST PR-LEFT
(060rPEB ABVIr. my nEB) selector switch to ON (BKn) and the ENG
DUST PR RIGHT (060rPEB ABVIr. n3Y nPAB.) selector switch to MAN
(PY4HOE). At the above ambient temperatures switch on the engine and
dust protection device anti-icing system on the ground after starting the
engines.
Note: In case of urgent necessity (to improve the helicopter cargo carry-
ing capacity through complete usage of the available power of the
engines) it is allowed to switch off the engine anti-icers for a pe-
riod of time required for takeoff or landing (1 to 2 min), provided Ic-
ing conditions are absent. This done, switch on the anti-icers and
report to the flying control officer that the anti-leers are on.
The ice detector heater operation mode selector switch should be selta
AUTO (ABTOMAT), locked and sealed.
If the engines anti-icers failed to be switched on manually at a ground
ambient temperature above +5°C and the ambient air temperature drops
in flight, switch them on again manually in flight upon attainment of an
ambient temperature of +5°C or below, for this purpose set the ANTI-
ICING SYSTEM, ENG DUST PR-RIGHT (060rPEB ABVIr. my nPAB)
selector switch to MAN (PY4HOE) and the ENG DUST PR-LEFT
(060rPEB ABVlr.mY nEB) selector switch to ON (BKn). Monitor varia-
tion of the ambient temperature by reading the ambient temperature Indi-
cator Installed In the flight compartment.
Warning: Delayed switching on of the engines and dust protection de-
vices auti-icers may cause inadvertent shutdown of the en-
gines due to ingress of ice accumulated in the air intakes into
the engine.
In flight switch on the engines anti-icers manually and alternately to pre-
vent possible simultaneous shutdown of both engines due to ingress of
ice Into their air intake ducts.
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