36 Questions
What is the correct trim speed for the aircraft during different phases of flight?
Move rapidly when trimming the aircraft during climb out and landing approach and slowly during cruise.
What determines the direction of travel of an electrically operated variable incidence tailplane?
Solenoid operated clutches.
On an aircraft with a variable incidence trimming tailplane, how does the tailplane incidence change?
If the trim wheel is turned back or forward.
What is the purpose of horn balance and inset hinge balance installed on control surface assemblies?
They have the same effect as a balance tab.
What is the primary function of the fin on an aircraft?
To provide directional stability about the normal axis.
Which of the following are primary control surfaces on an aircraft?
Elevators, ailerons, rudder.
What is the effect of aerodynamic balance on control surfaces?
It will reduce aerodynamic loading.
Which of the following can be used to reduce flutter on an aircraft?
Mass balancing.
What does an elevator provide control over?
The lateral axis.
What is the effect of excess aerodynamic balance on a control surface?
It will move the control surface center of pressure forwards, resulting in an unstable overbalance.
What is the primary function of the spar web in an aircraft wing structure?
To carry shear loads
Which component of an aircraft wing is responsible for taking the majority of the bending and shear loads?
Main spar
If an aircraft wing has an aspect ratio of 8, what can be inferred about the relationship between its span and mean chord?
The span is 8 times the mean chord
Which type of wing design is commonly found on commercial airliners?
Cantilever wing
What structural components primarily define the aerodynamic profile and contour of a monospar wing?
Ribs
What type of high-lift device is typically associated with provisions and linkages on the leading edge of a wing?
Leading edge flaps
What is the purpose of a 'frise' aileron?
To equalize aileron drag in a turn
Which of the following is a method of achieving aerodynamic balance of a control surface?
By a horn at the extremity of the surface forward of the hinge line
What is the purpose of aerodynamic balancing of flight controls?
To make the flying controls easier to move
What is a 'horn balance'?
A projection of the outer edge of the control surface forward of the hinge line
How is a control surface mass balanced?
By the attachment of weights acting forward of the hinge line
What is the purpose of the extension to the rudder (shaded portion shown on the diagram)?
To provide aerodynamic assistance for the pilot when moving the rudder
What is the purpose of a balance tab?
To operate automatically to assist the pilot in moving the controls
What can cause control surface flutter?
Excessive play in trim tab attachments
What is the purpose of aerodynamic balancing of a control surface?
To assist the pilot in moving the control
What is the purpose of anti-balance tabs?
To allow the leading edge of the surface to project into the airflow
What is the primary function of the mid-spar in large aircraft?
To assist the main spar in carrying operational loads
To which structural component is the main undercarriage attached?
The aircraft structure
What is the final coat of sealing called in an integral fuel tank?
Brush coat
Which structural members bear the primary loads on a wing?
Spars
What is the purpose of ribs in an aircraft wing?
To maintain the correct airfoil contour
Which statement best describes a cantilever wing?
A wing without external supporting struts
Why are spars tapered from root to tip?
Bending moment is greatest at the root
What is a spar web?
A member between the spar and wing/fuselage connection
To what component is a leading edge slat attached?
The slat track
What type of load does the web of an 'I' beam primarily take?
Shear
Test your knowledge about aircraft components by answering questions related to mid-spars, engine mounts, landing gear mounts, and undercarriages.
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