AFAB 115 Aircraft Structures Exam
Questions and Answers
When can you determine the strength of a load under Compressive Stress? - Answer-
Once all holes are backed by a material of equal or greater strength.
Define Shear Stress - Answer-Tends to slide nearby particles of materials past each
other; sideways stress;
Define Bending Stress - Answer-Also known as Beam Stress; a combination of two
forces acting on a structural member at one or more points
Give an Example of Bending Stress - Answer-Using the average human hand, the
bending of the wrist offers tensile stress at the top and compressive stress underneath
the wrist. Notice how your skin needs to stretch toward your fingers (tensile stress) at
the top of the wrist while your skin tightens and comes together at the bottom of the
wrist (compressive stress).
Define Torsion Stress - Answer-Also known as Twisting Stress; tends to twist a
structural member;
Give an example of Shear Stress - Answer-A loaf of bread being sliced
What is the resulting stress of Torsion? - Answer-Shear Stress
Give an example of Torsion Stress - Answer-The wringing of a towel
Why is it important to understand stresses? - Answer-Technician needs to be able to
classify the damage and moreover understand how to repair it; being a sheet metal
technician, we should understand that classification of any damage as one of the three
basic stresses (bending, torsion, and shear) would also allow any combination of the
stresses. This is also important when determining the types of fasteners to use. If the
material ends up shearing, it could break a weaker fastener in half. For that reason,
technicians and engineers have to think and plan ahead especially in an industry where
lives are at stake.
Structural Member - Answer-Everything on an airplane.
List the basic parts of a plane. - Answer-FLEEW (Fuselage, landing gear, empenage,
engine, wings)
, What part of an airplane has a section that looks like the letter "I" sideways? - Answer-
Wing Spar
What part of a plane has a section that looks like a teardrop? - Answer-Wing Rib
Where are ailerons located? - Answer-On the outer edge of the wing
What do the ailerons control? - Answer-The yaw (up and down)
Where are rhe flaps located? - Answer-On the inner edge of the wing
What are the types of flaps? - Answer-Plain, Split, Fowler
Which flap looks like scissors? - Answer-Split
Which flap looks like half a pair of scissors? - Answer-Fowler
What part carries the fuselage load and serves as the strongest aspect of the wing? -
Answer-Wing Spar
Why are metal properties important? - Answer-These is important because they
determine the ability or lack, thereof, for a material to carry a load; we use aluminum
alloys because they are ductile, malleable and perform as a conductor.
What is used to disrupt airflow? - Answer-Wing Spoilers
Where is the rudder located? - Answer-On the tail
What does the rudder do? - Answer-Controls Pitch (left and right)
What is the primary load carrying structure of the fuselage? - Answer-Longerons
What are the primary flight controls? - Answer-REA (Rudder, Elevators, Ailerons)
What are the secondary (auxillary) flight controls? - Answer-Slats, Spoiler, Flaps
What is the outer layer of an airplane called? - Answer-Skin
What wing style looks like a triangle? - Answer-Delta
What wing style looks like a trapezoid with a 90 degree angle? - Answer-Taper
What wing style looks like a slanted trapezoid? - Answer-Swept Back
Define Strength - Answer-The ability for a material to resist stress without breaking.
Questions and Answers
When can you determine the strength of a load under Compressive Stress? - Answer-
Once all holes are backed by a material of equal or greater strength.
Define Shear Stress - Answer-Tends to slide nearby particles of materials past each
other; sideways stress;
Define Bending Stress - Answer-Also known as Beam Stress; a combination of two
forces acting on a structural member at one or more points
Give an Example of Bending Stress - Answer-Using the average human hand, the
bending of the wrist offers tensile stress at the top and compressive stress underneath
the wrist. Notice how your skin needs to stretch toward your fingers (tensile stress) at
the top of the wrist while your skin tightens and comes together at the bottom of the
wrist (compressive stress).
Define Torsion Stress - Answer-Also known as Twisting Stress; tends to twist a
structural member;
Give an example of Shear Stress - Answer-A loaf of bread being sliced
What is the resulting stress of Torsion? - Answer-Shear Stress
Give an example of Torsion Stress - Answer-The wringing of a towel
Why is it important to understand stresses? - Answer-Technician needs to be able to
classify the damage and moreover understand how to repair it; being a sheet metal
technician, we should understand that classification of any damage as one of the three
basic stresses (bending, torsion, and shear) would also allow any combination of the
stresses. This is also important when determining the types of fasteners to use. If the
material ends up shearing, it could break a weaker fastener in half. For that reason,
technicians and engineers have to think and plan ahead especially in an industry where
lives are at stake.
Structural Member - Answer-Everything on an airplane.
List the basic parts of a plane. - Answer-FLEEW (Fuselage, landing gear, empenage,
engine, wings)
, What part of an airplane has a section that looks like the letter "I" sideways? - Answer-
Wing Spar
What part of a plane has a section that looks like a teardrop? - Answer-Wing Rib
Where are ailerons located? - Answer-On the outer edge of the wing
What do the ailerons control? - Answer-The yaw (up and down)
Where are rhe flaps located? - Answer-On the inner edge of the wing
What are the types of flaps? - Answer-Plain, Split, Fowler
Which flap looks like scissors? - Answer-Split
Which flap looks like half a pair of scissors? - Answer-Fowler
What part carries the fuselage load and serves as the strongest aspect of the wing? -
Answer-Wing Spar
Why are metal properties important? - Answer-These is important because they
determine the ability or lack, thereof, for a material to carry a load; we use aluminum
alloys because they are ductile, malleable and perform as a conductor.
What is used to disrupt airflow? - Answer-Wing Spoilers
Where is the rudder located? - Answer-On the tail
What does the rudder do? - Answer-Controls Pitch (left and right)
What is the primary load carrying structure of the fuselage? - Answer-Longerons
What are the primary flight controls? - Answer-REA (Rudder, Elevators, Ailerons)
What are the secondary (auxillary) flight controls? - Answer-Slats, Spoiler, Flaps
What is the outer layer of an airplane called? - Answer-Skin
What wing style looks like a triangle? - Answer-Delta
What wing style looks like a trapezoid with a 90 degree angle? - Answer-Taper
What wing style looks like a slanted trapezoid? - Answer-Swept Back
Define Strength - Answer-The ability for a material to resist stress without breaking.
