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System Operation

The pitch computer senses changes and makes corrections to maintain the aircraft fuselage in that particular pitch attitude by sending equal signals to both cyclic actuators.  Now, to change to a new pitch attitude, all that has to be done is to move the cyclic fore or aft.  A micro switch in the pitch TDU senses this longitudinal cyclic movement and activates the pitch computer ICO.  Once you stop moving the controls,  the computer waits for movement about its axis to stabilize below 1.5o per second for a period of 900 milliseconds.  At that time the ICO is secured again.  This delay lets the aircraft settle down, and then the computer maintains the new attitude. The roll axis system functions in the same way, except the computer only senses change in the roll axis.  For roll inputs the cyclic actuators move simultaneously in opposite directions.  To accomplish this, equal signals are sent to both cyclic actuators except one signal is reversed in polarity for roll input, left or right.  For the yaw axis, the principal is the same.  A rate in the yaw computer senses changes about its axis and makes inputs to the tail rotor controls to hold the last heading set.  The yaw system has the micro switches located in the pedal assemblies and not in the TDU.  To change heading, move the pedals to the new setting.  The micro switch will ICO the computer and once the computer detects that the aircraft has settled down it will maintain the new heading.

10.3.

Identify the operational functions and limitations of the MINISTAB system.

10.3.1.

State how movement of the flight the controls operate with the various computers in the MINISTAB system to control flight.

The pitch computer senses changes and makes corrections to maintain the aircraft fuselage in that particular pitch attitude by sending equal signals to both cyclic actuators.  Now, to change to a new pitch attitude, all that has to be done is to move the cyclic fore or aft.  A micro switch in the pitch TDU senses this longitudinal cyclic movement and activates the pitch computer ICO.  Once you stop moving the controls,  the computer waits for movement about its axis to stabilize below 1.5o per second for a period of 900 milliseconds.  At that time the ICO is secured again.  This delay lets the aircraft settle down, and then the computer maintains the new attitude. The roll axis system functions in the same way, except the computer only senses change in the roll axis.

10.3.2.

Identify the airspeed and attitude limitations associated with the MINISSTAB system.

With the ministab in operation Vne is reduced to 122 knts at density altitudes of 3000 and below.  >3000’ DA will depend on gross weight and DA flown.

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