Pitch Trim and Cruise Sub-mode Logic
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Questions and Answers

What is the pitch authority limit for the elevator control system?

Limiting column authority in the nose down direction if the aircraft exceeds the maximum operating speed.

What is the purpose of the backup pitch control system in the elevator control system?

entered when communication is lost between the FCC and HSCU

How is pitch control designed to behave at high altitude?

Pitch response is conventional, but with additional damping, especially at high altitude.

How is the backup pitch control system initiated?

<p>Both switches must be actuated simultaneously in the same direction (NOSE UP or NOSE DOWN)</p> Signup and view all the answers

What happens if the aircraft exceeds the maximum operating speed in terms of pitch trim?

<p>No protection against exceeding the maximum mach number.</p> Signup and view all the answers

Where is the horizontal stabilizer surface mounted?

<p>at the top of the vertical stabilizer</p> Signup and view all the answers

How does the elevator movement respond to variations in weight and center-of-gravity?

<p>Elevator movement is augmented with sensor feedback to provide a more consistent response to column input.</p> Signup and view all the answers

What supports the horizontal stabilizer?

<p>an aft hinge and a forward dual-electric-motor jackscrew actuator</p> Signup and view all the answers

How is the pitch trim nose up limit defined?

<p>Pitch authority limit</p> Signup and view all the answers

What is the pitch trim nose up limit in the elevator control system?

<p>Actuation of any pitch trim switch commands the stabilizer to move at its maximum rate of 0.4 degrees per second in the direction commanded.</p> Signup and view all the answers

What conditions must be met for the FCC to enter Maintenance mode?

<p>Aircraft must be in 'on-ground stationary' condition with specific criteria met.</p> Signup and view all the answers

What is the possible cause indicated by the CAS message 'Pitch Authority Limit'?

<p>Pitch axis flight control surfaces approaching maximum displacement.</p> Signup and view all the answers

What does the CAS message 'Pitch Control Miscompare' suggest?

<p>Pilot and copilot pitch control column positions are different.</p> Signup and view all the answers

What does it mean when the pitch trim is at the 'Nose Down Limit'?

<p>Pitch trim is at the nose down limit.</p> Signup and view all the answers

When is the advisory message 'Pitch Trim Nose Up Limit' displayed?

<p>Pitch trim is at the nose up limit.</p> Signup and view all the answers

What is the maximum rate of stabilizer movement when pitch trim is commanded?

<p>0.4 degrees per second</p> Signup and view all the answers

What sub-mode is the Flight Control System (FCS) in when the aircraft is on the ground?

<p>On-ground sub-mode</p> Signup and view all the answers

At what approximate airspeed does the amount of elevator deflection per column deflection start to decrease?

<p>135 KCAS</p> Signup and view all the answers

What is the purpose of decreasing the elevator deflection per column deflection at higher speeds?

<p>To prevent pitch response from being too sensitive</p> Signup and view all the answers

At what airspeed range does the yaw damper transition from 0% to 100% effectiveness?

<p>Between 60 KCAS and 90 KCAS</p> Signup and view all the answers

What is the purpose of increasing approach speed during strong or gusty wind conditions?

<p>To protect against unnecessary entry into angle of attack (AOA) limiting during landing and flare.</p> Signup and view all the answers

What is the recommended approach speed in strong wind conditions?

<p>VREF plus 1/2 of the steady state wind plus the full gust increment, not exceeding VREF + 20 KCAS.</p> Signup and view all the answers

How does the roll control system work in this aircraft?

<p>Wheel deflection translates directly to aileron and roll spoiler deflection.</p> Signup and view all the answers

What is the purpose of the yaw damper mentioned in the text?

<p>To damp dutch roll oscillations using sensor feedback to the rudder in combination with rudder pedal input.</p> Signup and view all the answers

What is the effect of nose up pitch trim according to the text?

<p>Nose up trim has no effect.</p> Signup and view all the answers

What conditions need to be satisfied for the FCS to be in the AOA limiting sub-mode?

<p>WOW from both main landing gear indicates weight off wheels, AOA limiting is available, and Normalized AOA is greater than the AOA limiting sub-mode entry threshold</p> Signup and view all the answers

What message is displayed when the aircraft enters the AOA Limiting sub-mode?

<p>FCC AOA Limiting (advisory) CAS message</p> Signup and view all the answers

What controls the angle of attack in the pitch control system?

<p>Column commands</p> Signup and view all the answers

How can the aircraft exit the AOA limiting sub-mode?

<p>Reducing angle of attack</p> Signup and view all the answers

What happens if there is a pitch trim nose down limit miscompare in the elevator control system?

<p>The elevator control system will be disabled</p> Signup and view all the answers

What is the pitch authority limit for the elevator control system?

<p>Full aft column</p> Signup and view all the answers

What will trigger a transition to the on-ground sub-mode while in AOA limiting mode?

<p>Aircraft touching down</p> Signup and view all the answers

How can the entry threshold for the AOA limiting sub-mode be substantially lowered?

<p>Significant pitch rate and rapid/large aft column input</p> Signup and view all the answers

What action can cause entry into the AOA limiting sub-mode at any normalized angle of attack?

<p>Abrupt nose up control input</p> Signup and view all the answers

What indicates that the AOA limiting sub-mode has been entered?

<p>FCC AOA Limiting (advisory) CAS message</p> Signup and view all the answers

What is the purpose of the pitch trim nose up limit in the elevator control system?

<p>The pitch trim nose up limit prevents excessive nose up pitching that could lead to a stall.</p> Signup and view all the answers

How does the pitch authority limit work in the elevator control system?

<p>At speeds above approximately 135 KCAS, the amount of elevator deflection per column deflection decreases, limiting the pitch response sensitivity.</p> Signup and view all the answers

What happens if there is a pitch control miscompare in the elevator control system?

<p>If there is a mismatch between the commanded and actual elevator position, the backup pitch control system is activated.</p> Signup and view all the answers

How does the elevator control system account for flap deflection?

<p>The elevator is biased one degree nose up for each notch of flap handle deflection (10, 20, or 30 degrees).</p> Signup and view all the answers

What is the purpose of the pitch trim nose down limit in the elevator control system?

<p>The pitch trim nose down limit prevents excessive nose down pitching that could lead to overspeed or structural damage.</p> Signup and view all the answers

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