Failure Of Gyro Horizon; Failure Of Compass System - Kazan Helicopters Mi-17-1V Flight Manual

M,,·17·1B. Flight manual
erative and make a decision to either continue or abort the mission.
(e) If the helicopter drifts off the established flight regime recognize the
failed channel by displacement of the trim indicator movable index
to the extreme position, disengage the failed channel, and make a
decision to either continue or abort the mission.
(f) In case of an inadvertent turning of the helicopter in yaw immedi-
ately place feet on the pedals. This done depression of the tiptoe
pedals will cause disengagement of the directional channel and
movement of the pedals will stop.
Caution: never re-engage the failed autopilot channel in flight.
6.20. Failure of gyro horizon
(1) Indications
(a) Appearance of the gyro horizon failure warning flag.
(b) The miniature aircraft fails to respond to changes in roll and pitch
attitudes.
(c) The miniature aircraft rotates about its axis.
(d) A jerk of the helicopter in roll and pitch with the right gyro horizon
failed and the autopilot engaged.
(2) Pilot's actions
(a) If the gyro horizon fails during flight in adverse weather conditions
abort the mission and land on the nearest aerodrome.
(b) With the gyro horizon inoperative refer to the following indicators:
turn indicator, altimeter, rate-of-climb indicator and the operating
gyro horizon. In VFR flight conditions the pilot should make a deci-
sion to either continue or abort the mission.
Note: Failure of the left gyro horizon is accompanied by the same
indications except for freedom from jerks in roll and pitch
with the autopilot engaged. In case of failure of the left gyro
horizon the pilot (Captain) makes a decision to either con-
tinue or abort the mission depending on the actual weather
conditions.
6.21. Failure of compass system
(1) Indications
(a) A sharp change in the heading displayed by the yrp-4YK (or
nHn-72-15) indicator at the moment of failure.
(b) Discrepancies in readings of the yrp-4YK (or nHn-72-15) indicator
and the Klt1-13 magnetic compass in horizontal straightforward
flight.
(c) A sharp but minor-in-magnitude jerk in yaw at the moment of the
system failure in flight with the autopilot engaged.
(d) Failure of the yrp-4YK (or nHn-72-15) indicator pointer to respond
to variation in the heading.
(e) Illumination of the GYRO TILT (3ABAJl rAj warning light on the
rMK-1A compass system control panel.
(2) Pilot's actions
(a) Fly to the nearest aerodrome using the ADF and Klt1-13 magnetic
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