Aircraft Flight Control Surface Actuators

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What are the components 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 pilot and copilot flight controls designed to operate?

The pilot and copilot flight controls are mechanically linked and are designed to operate in unison.

Where are the dual-channel FCCs installed in the aircraft?

The dual-channel FCCs are installed in the Left and Right Electronics Equipment Racks (LEER and REER).

What is the role of the Backup Flight Control Unit (BFCU) in the FCS?

The BFCU is designed to maintain emergency flight and landing capability in the event all four channels of the FCCs become unavailable. Signup and view all the answers

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

HA and EBHA Signup and view all the answers

What are the three modes of operation for the EBHA (Elevator Electrical Backup Hydraulic Actuator)?

Hydraulically Active, Electric Backup, Damped Bypass Signup and view all the answers

Under what conditions will the Flight Control System (FCS) be in the On-Ground sub-mode?

When the WOW from both the left and right main gear indicate weight on wheels, or when specific wheel speeds and radar altitude conditions are met Signup and view all the answers

What happens if both FCCs (all four channels) are inoperative in the aircraft's control system?

The BFCU controls the elevators, ailerons, outboard spoilers, and rudder. Signup and view all the answers

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

The SPOST is a feature of the FCC channels that runs when power is first applied, and it involves multiple checks including stick shaker activations and observing flight control capsule lights. Signup and view all the answers

How does the yaw damper function between 60 KCAS and 90 KCAS?

Between 60 KCAS and 90 KCAS, the yaw damper will smoothly transition from 0% to 100% effectiveness using simple yaw rate feedback to the rudder in combination with the rudder pedal input. Signup and view all the answers

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

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. Signup and view all the answers

How does the pitch control behave in 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). Signup and view all the answers

What are the indications of Alternate mode being active?

Alternate mode is primarily indicated by an FCC Alternate Mode (caution) CAS message. Signup and view all the answers

What is the behavior of the pitch control in Direct mode?

Column deflection translates directly to elevator command. Signup and view all the answers

How does the roll control behave when both flap and gear handles are up in Alternate mode?

The amount of surface deflection per pilot input will be less when both handles are up. Signup and view all the answers

Aircraft Flight Control Surface Actuators

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