Airframe Flashcards
How can upwards wing flex be avoided ?
Keep fuel in the wing as long as possible
What can help to reduce the vertical bending moments experienced by an aircraft wing during flight
Filling the tanks with fuel
Control surface flutter can be avoided by:
A high stiffness of the structure to which the control surface is attached
Locating a balancing mass in front of the control surface hinge line
The two deformation modes that cause a wing flutter are….
Torsion and bending
Which of the following statements is true about “plug type” aircraft doors ?
Each door can move inside and outside the aircraft
In a turn flight, which scenario will cause the most bending moment at the wing root?
HIGH ZERO FUEL MASS (ZFM), low fuel
What statements correctly combines the requirements for preventing control surface flutter?
A high stiffness on the structure to which the control surface is attached and a balancing mass located in front of the control surface hinge line
What is the primary purpose of flight deck windshield heating on a commercial jet aeroplane ?
To improve the Windows’ impact strength
Loads on the cylindrical part of the fuselage during pressurisation are mainly carried by the……
Skin
An operator notices corrosion on some metal parts of their aircraft fleet. What actions should they take ?
Repair, prime and paint the damage parts
What is the main purpose of flight deck windshield heating ?
To heat the vinyl and increase its impact resistance
What is the purpose of floor vents in a pressurised aircraft ?
Prevent floor distortion in the event of a rapid decompression
Flutter occurs when an external force is applied to the aircraft with a periodic frequency that is (1)……… the natural structural frequency of that aircraft.
Flutter can be avoided by ensuring that the aircraft remains inside the certified flight envelope, particularly for (2)……… and during turbulent conditions.
(1) equal to; (2) speed limitations
When on the ground in a hanger, which loads are acting in the skin of a cantilever wing outboard of the wing landing gear?
Tension in the upper skin, compression in the lower skin
The purpose of a cockpit eye reference indicator is……
To have a correct vertical and horizontal field of view only moving eyes
Which of the following actions can be taken to reduce the chance of a tail strike during take-off?
Accurately calculate take-off performance data
When flutter damping of control surfaces is obtained by mass balancing, these weights will be located with respect to the hinge line of the control surface
In front of the hinge
With non-load carrying skin, the wing bending moment is carried by the
Spars
The part of the aircraft’s fuselage which gives it its aerodynamic shape is the…….
Skin
Which part of the fuselage carries loads imposed by pressurisation
Skin
What is a torsion box formed by?
Wing spars, ribs, and wing skin reinforced by stringers
One function of a rib is…..
To maintain the aerodynamic shape of the wing
A composite material consists of…….
A matrix and fibres
What type of loads are in the spar of a cantilever wing during straight and level flight
The upper surface is in compression while the lower surface is in tension
A non-cantilever wing is supported by….
Struts
The function of ribs in a wing is to……
Maintain the required aerodynamic shape of the wing
The function of ribs in a wing is to……
Maintain the required aerodynamic shape of the wing
Heating of a transport aeroplane is……….
Essential to improve the strength and flexibility of the cockpit windows
When is a wing not subject to any tension or compression forces ?
Never, the wings are always subject to various forces
To achieve control surface flutter damping the balance mass must be be located
In front of the control surface hinge line
