Flight Controls Flashcards
Name the primary control surfaces.
Left and right ailerons.
Left and right elevators.
Rudder.
Name the secondary flight controls.
Inboard and outboard ground spoilers. Inboard and outboard multi-function spoilers. Inboard and outboard flaps. Left and right slats. Horizontal stabiliser.
How are the primary flight controls actuated?
Mechanical linkages from the flight deck actuate hydraulic power through power control units (PCUs).
What flight control surfaces are operated by the first officer’s control wheel?
Right aileron and multi-function spoilers.
Right elevator.
What flight control surfaces are operated by the the captain’s control wheel?
Left aileron and multi-function spoilers.
Left elevator.
Which hydraulic systems provides power to the ailerons?
System 1 and 3 power the left aileron.
System 2 and 3 power the right aileron.
Why are the multi-function spoilers actuated with aileron deflection?
To assist roll control at lower airspeeds.
What do the Spoiler and Stabiliser Control Units (SSCUs) do?
Control the multi-function spoiler position using inputs from various controls and sensors.
What does pulling the ROLL DISC handle do?
Separates the two aileron control cable systems allowing independent control of each aileron in the case of a cable jam.
What do the SSCUs do to the flight control surfaces in the event that the ROLL DISC handle is pulled?
Ensure the captain’s control wheel actuates the left aileron and right multi-function spoilers and the first officer’s control wheel actuates the right aileron and left multi-function spoilers.
In addition to the handle position, what other cockpit indications alert the flight crew that the ROLL DISC handle has been pulled?
After 20 seconds the two ROLL SEL lights illuminate on the glare shield.
What does the ROLL SEL switch light indicate when illuminated?
The roll system has been disconnected and no roll priority has been selected. With no roll priority, each control wheel operates independently of each other.
If the ROLL SEL switch lights are illuminated, how is roll priority selected to the first officer’s control wheel?
By pressing the ROLL SEL switch light on the first officer’s side.
What happens when a ROLL SEL switch light is pressed and turns green?
Roll priority is assigned to the onside control wheel which now operates the onside aileron and both side multi-function spoilers.
What happens if an aileron PCU makes an uncommanded deflection?
The SSCU assigns control of the multi-function spoilers to the opposite (operative) aileron.
Describe ‘bungee breakout’.
How is the flight crew alerted and what actions should be taken?
Bungee breakout occurs when one of the two PCUs actuating an aileron makes an uncommanded action. The SSCU senses this and assigns control of the multi-function spoilers to the opposite (operative) aileron.
The ROLL SEL switch light on the operative aileron side will illuminate. Pull the ROLL DISC handle.
Which hydraulic systems control the rudder?
Systems 1, 2 and 3.
How is the rudder system protected from a cable jam?
An anti-jam breakout mechanism allowing the pilots to overpower a jam with increased force.
What is the purpose of the rudder travel limiter and how is it controlled?
To prevent structural damage, the Spoiler and Stabiliser Control Unit (SSCU) regulates the amount of rudder deflection when a pilot depressed a pedal based on airspeed, flap handle position, engine operational status and weight-on-wheels status.
How many yaw dampers are installed, what is their purpose and how are they operated?
Two electrically controlled independent yaw dampers are installed.
They assist to reduce adverse yaw oscillations in flight, they also assist in directional stability and turbine coordination.
How are the yaw dampers disengaged?
By depressing the YAW DAMPER DISC switch.
