Failure Of Hydraulic System - Kazan Helicopters Mi-17-1V Flight Manual

M,,·17·1B. Flight manual
control lever before touchdown to prevent loss of trim.
(d) If the directional control is lost in hovering or shifts at a low altitude
proceed as follows:
1) Immediately but smoothly reduce the main rotor collective
pitch and descend to touchdown.
2) During descent apply the right pedal and the control stick to
the right in order to eliminate left turning and drift, and pull
back the control stick to counteract nose heaviness.
3) At the moment of touchdown by the main LG wheels immedi-
ately and vigorously reduce the main rotor pitch down to the
minimum value and shut down the engines.
4) If the helicopter turns upside down immediately abandon it
through the emergency exits.
6.13. Failure of hydraulic system
(1) Indications
(a) In case of failure of the main hydraulic system (pressure drop), the
hydraulic actuators are automatically selected to the auxiliary hy-
draulic system, and the AUX SYS ON (,QY6m1P. BKJlI04EHA) an-
nunciator comes on and the auxiliary hydraulic system pressure
+8
quickly rises from 45±3 to 65 -2
kgf/cm
2
,
the Pltl-65 information re-
porting system gives the voice warning: "Main hydraulic system
failed".
(b) Failure of the main hydraulic system may cause flashing of the AUX
SYS ON (,QY6JlltlP. BKJl104EHA) annunciator accompanied by pe-
riodical build-up and drop of the auxiliary hydraulic system pres-
sure.
(2) Crew's actions
(a) In case of failure of the main hydraulic system, immediately set the
MAIN HYD SYSTEM (OCHOBHA7I rltl,QPOCltlCTEMA) switch to
OFF (BbIKJl), abort the mission and land on a selected field.
Note: Upon selection of the auxiliary. hydraulic system the An.
346 autopilot and the collective pitch control lever friction
lock get disengaged. In this condition select an adequate
tightening of the collective pitch control lever friction lock to
have optimum efforts required for operation of the control
lever.
(b) In case of failure of the main and auxiliary hydraulic systems in
flight (indicated by severe creeping of the control stick and depres-
surization of both hydraulic systems) the crew should abandon the
helicopter upon the Captain's order. If the altitude does not allow to
abandon the helicopter proceed as follows:
1) Do not release the collective pitch control lever lock.
2) Reduce airspeed.
3) Change the engine power setting by means of the throttle
control twist grip.
4) Overcome the control pressure together with the Pilot-
Navigator.
5) Execute landing.
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