Flight Control System On-Ground Sub-mode Quiz
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Questions and Answers

What are the indications that the FCS is in the On-Ground sub-mode?

The pitch, roll, and yaw trim indicators will include a green band.

What happens to AOA limiting when the aircraft is on the ground?

AOA limiting is unavailable.

How does pitch control change as speed increases above 135 KCAS?

The amount of elevator deflection per column deflection decreases.

How is elevator bias related to flap deflection?

<p>The elevator is biased one degree nose up for each 'notch' of flap handle deflection.</p> Signup and view all the answers

At what airspeed does rudder deflection become solely dependent on rudder pedal deflection?

<p>Below 60 KCAS.</p> Signup and view all the answers

What indication primarily signals Direct mode?

<p>FCC Direct Mode (caution) CAS message</p> Signup and view all the answers

When in Direct mode, why is AOA limiting unavailable?

<p>Stall Protection Unavail (caution) CAS message</p> Signup and view all the answers

In both Alternate and Direct mode, how does column deflection affect pitch control?

<p>Column deflection translates directly to elevator command</p> Signup and view all the answers

How is roll control affected in Alternate and Direct mode?

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

What does actuation of any pitch trim switch command the stabilizer to do?

<p>Move at its maximum rate of 0.4 degrees per second</p> Signup and view all the answers

What are the conditions that must be satisfied for the FCS to enter the AOA limiting sub-mode?

<p>The conditions are: WOW from both main landing gear indicates weight off wheels, AOA limiting is available as indicated by the absence of the Stall Protection Unavail (caution) CAS message, and Normalized AOA is greater than the AOA limiting sub-mode entry threshold.</p> Signup and view all the answers

Describe the pitch control behavior in the AOA limiting sub-mode.

<p>In the AOA limiting sub-mode, column commands angle of attack, with full aft column resulting in maximum allowed angle of attack (alpha limit of approximately 0.96 normalized AOA).</p> Signup and view all the answers

What happens when the aircraft touches down while in the AOA limiting mode?

<p>If the aircraft should touch down while in AOA limiting mode, a transition to the on-ground sub-mode will occur, as on-ground conditions have priority.</p> Signup and view all the answers

What are the indications that the FCS has entered the AOA limiting sub-mode?

<p>The FCC AOA Limiting (advisory) CAS message will be displayed. Additionally, the Stall Protection Active (caution) CAS message will be displayed if the AOA is near its limit value of 0.96.</p> Signup and view all the answers

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

<p>In cases of significant pitch rate and rapid/large aft column input, the AOA limiting sub-mode entry threshold can be lowered substantially.</p> Signup and view all the answers

What condition(s) must be satisfied for the Flight Control System (FCS) to be in Normal mode?

<p>Two or more air data probes are heated and providing consistent data AND At least one IRU is operating without conflicting data from another IRU or all operating AHRS AND The horizontal stabilizer is not in Backup Mode.</p> Signup and view all the answers

How is the horizontal stabilizer directly controlled when the FCS is in Backup Mode?

<p>The horizontal stabilizer is directly controlled by the center console backup trim switch.</p> Signup and view all the answers

What are the four sub-modes of the Normal mode in the Flight Control System?

<p>The four sub-modes are: On-ground, Takeoff and Landing, Cruise, and Angle of Attack (AOA) Limiting.</p> Signup and view all the answers

What condition(s) must be met for the FCS to transition from the On-ground sub-mode to the Takeoff and Landing sub-mode during a normal takeoff?

<p>Both the left and right main gear wheel speeds are 47 knots or greater and Radar altitude is less than 10 feet.</p> Signup and view all the answers

What is the purpose of the Angle of Attack (AOA) Limiting sub-mode?

<p>The purpose of the AOA Limiting sub-mode is not explicitly stated in the given text.</p> Signup and view all the answers

What is the purpose of the 'ailerons as ground spoilers' function, and how does it affect aircraft roll control and pitch?

<p>The 'ailerons as ground spoilers' function commands the ailerons to the full trailing edge-up position to act as ground spoilers. This does not affect aircraft roll control, which utilizes a single aileron with an increased displacement ratio. However, it does create a nose-up pitching moment, which is balanced by a slight elevator trailing-edge-down displacement commanded by the FCC.</p> Signup and view all the answers

How can the 'ailerons as ground spoilers' function be removed, and in which flight control modes is it available?

<p>Removing the 'ailerons as ground spoilers' function requires the same pilot actions as stowing the ground spoilers, such as selecting the GND SPOILER switch to the OFF position or advancing at least one throttle forward, out of the idle position. This function is only available when operating in FCC Normal and Alternate modes.</p> Signup and view all the answers

Describe the functionality and indications of the GND SPOILER switch.

<p>The GND SPOILER switch must be in the ARMED position for automatic ground spoiler deployment. The switch has a split lens, with the upper portion labeled OFF (amber) and the lower portion labeled ARMED (blue). When the switch is extended, OFF is illuminated (gear down) or the switch is dark (gear up). When the switch is depressed, ARMED is illuminated.</p> Signup and view all the answers

What are the two functions of the GPWS / GND SPLR FLAP ORIDE switch?

<p>The GPWS / GND SPLR FLAP ORIDE switch serves two functions, but the text does not provide details on what those functions are.</p> Signup and view all the answers

In which flight control modes is the 'ailerons as ground spoilers' function available?

<p>The 'ailerons as ground spoilers' function is only available when operating in FCC Normal and Alternate modes.</p> Signup and view all the answers

What is the primary indication that the Flight Control System (FCS) is in Alternate mode?

<p>The primary indication of Alternate mode is an FCC Alternate Mode (caution) CAS message.</p> Signup and view all the answers

How does the amount of surface deflection per pilot input change in Alternate mode when the flap or gear handle is not up?

<p>When either the flap or gear handle is not up (assumes 250 KCAS) in Alternate mode, the amount of surface deflection per pilot input for pitch, roll, and yaw will be greatest.</p> Signup and view all the answers

How does the FCS handle yaw control in Alternate mode if IRU #3 data is available?

<p>If IRU #3 data is available in Alternate mode, a simplified yaw damper will damp dutch roll oscillations.</p> Signup and view all the answers

What is the maximum rate at which the stabilizer moves when any pitch trim switch is actuated in Alternate mode?

<p>When any pitch trim switch is actuated in Alternate mode, the stabilizer moves at its maximum rate of 0.4 degrees per second.</p> Signup and view all the answers

What mode does the FCS enter after all four FCC channels become invalid?

<p>The FCS will enter Direct mode after all four FCC channels become invalid.</p> Signup and view all the answers

What are the conditions required for the ground spoilers to deploy?

<p>The ground spoilers deploy when the GND SPOILER switch is ARMED, both throttles are at idle, and one or more of the following conditions are met: (1) Left MLG weight-on-wheels (WOW) AND left wheel speed &gt; 47 kts, (2) Right MLG WOW AND right wheel speed &gt; 47 kts, (3) Both WOW AND radalt &lt; 10 ft OR invalid, (4) Both wheel speeds &gt; 47 kts AND radalt &lt; 10 ft OR invalid AND flaps &gt; 22 OR GND SPLR FLAP ORIDE switch ON.</p> Signup and view all the answers

What is the purpose of arming the ground spoilers prior to takeoff and full-stop landings?

<p>The ground spoilers are normally armed prior to takeoffs and full-stop landings to allow for deployment during a rejected takeoff or after landing.</p> Signup and view all the answers

How do the ailerons function as ground spoilers?

<p>The ailerons deploy as ground spoilers to reduce lift and increase drag after landing or during a rejected takeoff, using the same activation logic as the ground spoilers (weight-on-wheels or wheel speed, and both throttles at idle).</p> Signup and view all the answers

What is the purpose of AOA limiting, and when is it unavailable?

<p>AOA limiting is a flight control system function that limits the aircraft's angle of attack to prevent stalls. It is unavailable when the aircraft is in Direct mode.</p> Signup and view all the answers

How does pitch control change as airspeed increases above 135 KCAS?

<p>As airspeed increases above 135 KCAS, pitch control becomes more dependent on elevator deflection and less dependent on stabilizer trim.</p> Signup and view all the answers

What are the indications that the flight control system is in the On-Ground sub-mode?

<p>The indications that the flight control system is in the On-Ground sub-mode are not explicitly stated in the given text.</p> Signup and view all the answers

At what airspeed does rudder deflection become solely dependent on rudder pedal deflection?

<p>The provided text does not specify an airspeed at which rudder deflection becomes solely dependent on rudder pedal deflection.</p> Signup and view all the answers

In Alternate and Direct modes, how does column deflection affect pitch control?

<p>The provided text does not explain how column deflection affects pitch control in Alternate and Direct modes.</p> Signup and view all the answers

What does actuation of any pitch trim switch command the stabilizer to do?

<p>The provided text does not mention what actuation of pitch trim switches commands the stabilizer to do.</p> Signup and view all the answers

How is roll control affected in Alternate and Direct modes?

<p>The provided text does not explain how roll control is affected in Alternate and Direct modes.</p> Signup and view all the answers

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