User manual

DodoSim 206 FSX User Manual

Page 72

4.2.3.2 Tail Transmission Failure

In the event of a tail transmission failure, all tail rotor thrust is lost. The pilot will be unable to use

the tail rotor to either affect the helicopter’s heading or compensate for torque-induced yaw.

Since torque-induced yaw is only generated when the engine is turning the rotors, the best course

of action is for the pilot to throttle the engine back to idle and auto-rotate to a landing.

Alternatively, it might be possible for the pilot to attempt a run on landing whilst maintaining full

engine power. By keeping the airspeed close to 40 knots, where the aerodynamic properties of the

vertical stabiliser are able to maintain a reasonably straight direction of flight, the pilot is able to

adjust the direction of flight by increasing or decreasing the torque-induced yaw using collective

pitch.

4.2.4 Control Failures

4.2.4.1 Stuck Anti-Torque Pedal

Stuck anti-torque pedals will result in a fixed amount of tail rotor thrust being generated for a given

power setting. You may find a “sweet spot” where the tail rotor thrust matches the torque-induced

yaw being generated. If it is possible to hover at that setting then you may be ale to reduce lift

slightly in order to effect a touchdown by circling the cyclic stick to deflect lift forces sideways.

Alternatively, reducing the collective slightly may lose enough lift to touchdown, so long as a

dangerous yawing spin is not allowed to develop otherwise the helicopter could roll over on

touchdown.

Your course of action with a stuck pedal depends very much on the circumstances and the degree

to and direction in which the pedals are stuck. It may be possible to adjust power in order to

maintain a constant heading allowing for a run-on landing.

4.2.4.2 Hydraulic “Control Boost” Failure

If the hydraulic control boost servos fail then the system should be disabled using the switch on the

pedestal panel to prevent sudden over-control at an inopportune moment should the problem

resolve itself.

Slow to between 60 and 70 knots using careful, steady cyclic inputs. Hovering is difficult without

hydraulics, (but not impossible), so aim to perform a run-on landing at a speed below 20 knots. In

gusty conditions attempting to hover is not recommended, as you may be unable to compensate

quickly enough.