Aircraft Controls and Mechanisms

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What components are included in the primary Flight Control System (FCS)?

The primary FCS includes the components that control the two ailerons, six spoilers, two elevators, and one rudder.

How are the flight control surfaces actuated and controlled?

The flight control surfaces are hydraulically actuated and electrically controlled with fly-by-wire technology.

What is the significance of the System Power On Self-Test (SPOST) in the aircraft's flight control system?

The SPOST is a feature of the FCC channels that runs when power is first applied, and it checks the system for proper functioning.

How does the aircraft's control system handle the situation when both FCCs (all four channels) are inoperative?

In the event that both FCCs are inoperative, the Backup Flight Control Unit (BFCU) controls the elevators, ailerons, outboard spoilers, and rudder.

What are the primary flight control surfaces that remain operational if one hydraulic system is lost?

All primary flight control surfaces (other than one mid or inboard spoiler pair)

What is the purpose of the Backup Flight Control Unit (BFCU)?

To maintain emergency flight and landing capability if all four channels of the FCCs become unavailable

What are the two types of primary flight control surface actuators mentioned in the text?

HA and EBHA

What are the three modes of operation for the EBHA?

Hydraulically Active, Electric Backup, Damped Bypass

What are the sub-modes of the Normal mode under the Flight Control System (FCS)?

On-ground, Takeoff and Landing, Cruise, Angle of Attack (AOA) Limiting

What is the pitch response at speeds above approximately 135 KCAS?

The amount of elevator deflection per column deflection will decrease so that the pitch response will not be too sensitive.

Under what conditions will the FCS be in the Cruise sub-mode?

When the On-ground sub-mode logic is not satisfied AND AOA limiting sub-mode logic is not satisfied AND either the autopilot is engaged OR both the landing gear and flap handles are up.

What indications will be displayed if the aircraft is near its angle of attack (AOA) limit value of 0.96?

The FCC AOA Limiting (advisory) CAS message will be displayed. Additionally, the (caution) CAS message will be displayed.

What conditions need to be satisfied for the Flight Control System (FCS) to be in the AOA limiting sub-mode?

The FCS will be in the AOA limiting sub-mode when Normal mode conditions are satisfied, 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.

What triggers the entry into the AOA limiting sub-mode, and what are the indications of being in this sub-mode?

Entry into the AOA limiting sub-mode can occur at any normalized angle of attack with abrupt nose up control input. The FCC AOA Limiting (advisory) CAS message will be displayed, along with the (caution) CAS message if the AOA is near its limit value of 0.96.

What are the conditions for the Flight Control System (FCS) to be in Alternate mode, and how is it primarily indicated?

The FCS will be in Alternate mode when specific conditions related to air data probes, IRU data, and horizontal stabilizer are satisfied. Alternate mode is primarily indicated by an FCC Alternate Mode (caution) CAS message.

What behavior is expected while in Direct mode, and how is it primarily indicated?

Direct mode behavior is the same as Alternate mode, and both are primarily indicated by a (caution) CAS message. In Direct mode, AOA limiting is unavailable as annunciated by the message.

What are the conditions for the Flight Control System (FCS) to be in AOA limiting sub-mode, and what are the indications of being in this sub-mode?

The conditions for entry into the AOA limiting sub-mode are WOW from both main landing gear indicating weight off wheels, AOA limiting available, and normalized AOA greater than the entry threshold. The indications of being in this sub-mode are the FCC AOA Limiting (advisory) CAS message and the (caution) CAS message if the AOA is near its limit value of 0.96.

What conditions need to be satisfied for the Flight Control System (FCS) to be in Alternate mode, and how is it primarily indicated?

The conditions for Alternate mode entry are less than two heated air data probes, inconsistent IRU data, or the horizontal stabilizer reporting being in Backup Mode. Alternate mode is primarily indicated by the FCC Alternate Mode (caution) CAS message.

How does the aircraft's control system handle the situation when both FCCs (all four channels) are inoperative?

When all four FCC channels become invalid, the FCS operates in Direct mode, where AOA limiting is unavailable as indicated by a (caution) CAS message.

What is the significance of the System Power On Self-Test (SPOST) in the aircraft's flight control system?

The SPOST is crucial for ensuring the availability and functionality of the Direct mode, which is utilized when all four FCC channels become invalid.

Under what conditions will the Flight Control System (FCS) be in the AOA limiting sub-mode, and how does the system handle the situation during landing and flare?

The FCS enters the AOA limiting sub-mode when Normal mode conditions are met and the AOA is greater than the entry threshold. To protect against unnecessary entry into AOA limiting during landing and flare, the approach speed should be increased during strong or gusty wind conditions.

What is the purpose of the AOA limiting sub-mode in the Flight Control System (FCS)?

To limit the angle of attack (AOA) during normal maneuvering to prevent excessive AOA and protect against unnecessary entry into AOA limiting during landing and flare.

How is the entry into the AOA limiting sub-mode triggered, and what are the indications of being in this sub-mode?

Entry into the AOA limiting sub-mode can occur at any normalized angle of attack with abrupt nose up control input. The FCC AOA Limiting (advisory) CAS message will be displayed, and the (caution) CAS message will be displayed if the AOA is near its limit value of 0.96.

Under what conditions will the Flight Control System (FCS) be in Alternate mode, and how is it primarily indicated?

The FCS will be in Alternate mode when conditions such as less than two heated air data probes, inconsistent IRU data, or the horizontal stabilizer reporting backup mode are satisfied. It is primarily indicated by an FCC Alternate Mode (caution) CAS message.

What is the behavior of the Flight Control System (FCS) in Direct mode, and how is it primarily indicated?

In Direct mode, the behavior is the same as Alternate mode, but with some software and hardware differences to ensure availability. It is primarily indicated by a (caution) CAS message, and AOA limiting is unavailable while in this mode.

What are the conditions for the Flight Control System (FCS) to enter the Yaw Control sub-mode, and what is the function of the yaw damper in this sub-mode?

The yaw damper will be active using sensor feedback to the rudder in combination with the rudder pedal input to damp dutch roll oscillations. It is primarily active when the aircraft is in Takeoff and Landing sub-mode. The yaw damper uses sensor feedback to the rudder and rudder pedal input to dampen dutch roll oscillations.

Test your knowledge of aircraft controls and mechanisms including springs, dampers, bungee rods, and mechanical stops. This quiz covers the components and functionality of the control system in the aircraft cockpit.

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