1) ¿What is the “90 seconds rule”?
Every comercial aircraft must be able to be evacuated, in medium density configuration,within 90 seconds, using only 50% of the doors. In order to measure the time, the passengers are a representative sample of population without any preparation.
Every comercial aircraft must be able to be evacuated, in maximum density configuration,within 90 seconds, using only 50% of the doors. In order to measure the time, the passengers are a representative sample of population without any preparation.
Every comercial aircraft must be able to be evacuated, in medium density configuration, in more than 90 seconds, using only 75% of the doors. In order to measure the time, the passengers are a representative sample of population without any preparation.
Every comercial aircraft must be able to be evacuated, in maximum density configuration, within 90 seconds, using only 75% of the doors. In order to measure the time, the passengers are a representative sample of population without any preparation.
2) Which is the main difference between monocoque and semi-monocoque structures?
Structural elements to share the load
Semi-Monocoque is used in missiles
Monocoque is only for wings
Semi-monocoque is only for fuselage
3) Why are cockpit windows made with a thin-film gold?
Because it is stylish
In order to increase the windows resistance
thin-film gold is needed for the airplane’s anti-fog system
It reduces the radar signature
4) What is the wing stringers?
They are span-wise elements to support the skin and increase the rigidity to compression.
They are attached to formers in the wing.
They are support the main loads of the wing performance.
They are used only in military aircraft
5) Stringers are used in the wing to fix...
buckling effect
Coanda effect
Traction forces
Torsion forces
6) The ribs of the wind are orientated....
In the same direction as the aerodynamic chord
Perpendicular to the aerodynamic chord
Oblique to the aerodynamic chord
Ribs are not located in the wing but in the fuselage.
7) What is the Skin of the aircraft structure?
It is the external part of the structure, which mission is to resist shear and isolate the fuel from the atmosphere.
It is a lift device attached to the fuselage
It is the internal part of the structure, which mission is to resist shear and isolate the fuel from the atmosphere.
It is the external part of the window, which mission is to resist shear and avoid hits on the window surface.
1) Low-wing characteristic:
Block pilot’s visibility in a turn
Wing can be manufactured in only 1 section
The center wing structure is used for the cabin flood and to accommodate the landing gear without aerodynamic penalty
Structural carrythrough
2) If engines are located “faired” in the wing , the structural design of the joint region is highly complex.
3) What is used in fighters.
Central Box.
Formerons
4) Cruciform tail exposes the lower part of the rudder to undisturbed air during high angle-of-attack conditions and spins.
5) Twin tail characteristics: 1) High maniobrability. 2) Reduces the weight. 3) Is proposed to reduce adverse roll-yaw coupling. 4) Fits into existing hangars.
1,3
1,2
1,2,4
2,3,4
6) C-anard disadvantage:
Reduced forward and down visibility
Higher landing and take off speeds
Lower maneuverability
May be prone to suffering a dangerous deep stall condition
7) Which is the main advantage of mid-wings?
Aerobatic maneuverability
Prevent "floating" (ground effect) that complicates the landing and the placement of motors allow landing in unimproved fields
Delay the critical Mach
The center wing structure is used for the cabin floor and to accommodate the landing gear without aerodynamic penalti
