Tabs Flashcards
What are trim tabs classed as?
A secondary flight control
What does a trim tab compensate for?
The imbalance of the aircraft
Are trim tabs fixed or movable?
Both
When can trim tabs be adjusted?
Before flight
When can trim tabs be adjusted?
Before flight
How are trim tabs deflected?
To oppose flight control systems direction
What do trim tabs do to the control surface?
Keep it in position
Where are balance tabs used?
Where excessive force may be needed to move the control surfaces especially at high speeds
How are balance tabs connected to the control surface?
Connected by a fixed rod to allow it to automatically move to opposing position
What does a balance tab do?
Changes camber assisting deflection but reduces control surface efficiency
What are antibalance tabs similar to?
Anti balance tabs but opposite
How does an anti balance tab move?
In the same direction as a control surface in order to add resistance
How is the deflection of and anti balance tab compared to that of the control surface?
Deflection of tab is greater than the deflection of the surface
Where are anti balance tabs used?
With sensitive controls to help with feel
What does an anti balance tab mean?
More effort to move the control surface
How are servo tabs operated?
Directly by the pilot
Where are servo tabs used?
To operate a control surface which is free moving
How are servo tabs typically moved?
In opposition to direction of desired flight control
What is a balance panel?
Plate connected to the leading edge
What are the two chambers created by balance panels?
Upper chamber & lower chamber
What assists deflection in balance panels?
Pressure difference
What is aerodynamic balance?
Effort required to balance a control surface
Where do forces act on a wing in flight?
At the centre of pressure
What happens when there’s a centre of pressure behind the hinge line?
There’s a moment force to be overcome
