NOTE
In case of NR/N2 switch locked at 102% the pilot can complete
the flight provided that the airspeed is limited to 130 KIAS.
Correct trouble before next flight.
DRIVE SYSTEM FAILURES
TAIL ROTOR FAILURE
A tail rotor drive failure results in a loss of yaw control with a consequent yaw
to the right, which is the more rapid, the less the forward speed is and the more
the torque level is.
In fact the vertical fin produces an antitorque component which is a function
of the forward speed and which permits to control the helicopter in low torque
conditions.
A tail rotor drive failure may be accompanied by noise, vibration or oscillation
in the tail section.
The action to be taken is different whether the helicopter is in hover or in
forward flight.
In both cases the landing should be made at the lowest possible power or even
with both engines out.
While a tail rotor drive failure in hovering is immediately detected, the same
failure may be less evident in cruise.
In case of an event making suspect of a possible trouble in the tail section when
flying at cruise speed, proceed as follows:
Altitude : Maintain the cruise altitude.
Airspeed and pedal control : Reduce gradually to 60 KIAS
and meanwhile check the heli-
copter response to pedal control
displacement and the ap-
pearence of any anomalous vi-
brations and/or noise.
RFM A109E
3-38 R.A.I. Approved
Rev. 11
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