AIRFRAME STRUCTURES 11.2 / 11.3 Flashcards
Where are body stations measured from?
A point in front of the nose
Major zones are divided into sub-manor zones. How are these identified? E.g. Zone 420
2nd digit
How is the skin reinforced in semi-monocoque airframe construction?
Longitudinal members
On airbus aircraft, which kind of value has a position right of the aircraft centre line?
Negative “Y”
What is a body station?
A plane passing vertically through the fuselage and measured from a reference point in front of the aircraft
What is the primary function of the fuselage frames?
To maintain the shape of the fuselage and to carry / distribute shear / tension loads
What is one purpose of the dorsal fin?
It joins the fin smoothly to the fuselage
What is the main function of the passenger door torque tube?
To rotate the door to the cocked position
What is the purpose of the cockpit sliding windows?
To provide the flight crew an emergency exit and give direct vision to the ground
What are the main structural components in an aircraft wing?
Ribs
Spars
Stringers
Skin
What is the mainframe of the wing designed to do?
Transmit loads to the fuselage structure
How can the front spar of the horizontal stabiliser be accessed?
From the front by removing the leading edge
Are both horizontal and vertical stabilisers inside or outside the fuselage pressurised area?
Outside
How is the rudder attached to the aircraft?
It is hinged to the training edge of the vertical stabiliser
What is the purpose of the fail-safe bolt on control surface hinges?
To provide a safety method of maintaining structural integrity should one of the internal parts of the bolt be damaged
Which loads are transmitted by the pylon bearings?
Lateral and longitudinal loads between the wing and pylon
What is the purpose of the wing to nacelle fairings?
To provide an aerodynamic profile to reduce drag
How is an engine pylon attached to the wing?
2 links at the front and spigot to the rear
What is the purpose of the vent hole in the inner part of a cabin window?
To equalise the pressure between the 2 panels and the cabin
How are cockpit fixed windows and windscreens installed?
Externally onto the cockpit frame structure
What is the function of a fuselage stringer?
It gives shape to the fuselage shell and can carry bending, shear, torsion, and cabin pressure loads
Which wing components are normally used to attach the leading and trailing edges?
Vertical stiffeners attaching wing spar webs
Which loads are mainly carried to the fuselage structure by wing upper skin panels?
Compression
What is the main purpose of the fan cowl support beam?
It supports the fan cowl and transmits the loads to the torque box
Which components go together to form a nacelle strut assembly?
Frames
External skins
When do aircraft escape slides deploy?
When the door is opened, and in the armed position
How can flight deck seats be secured to the aircraft?
They are mounted on rails on the flight deck floor
How are the galley trolleys secured during takeoff and landing?
They are put into special storage positions in the galley and locked in place
What is the purpose of the “ball-mat”
To allow cargo to run forward/aft and side to side during loading
What is the purpose of the inertia reel?
To lock the shoulder straps in the event of rapid deceleration (crew seatbelts)
How are galleys normally secured to the fuselage?
They are engaged in the seat rails at the bottom and attached to links on the structure at the top
Which precautions must be taken regarding air-stairs when aircraft is on jacks?
They should be supported by a suitable stand when extended
