M7.8 Flashcards
(50 cards)
- What type of rivet is most commonly used in aircraft construction?
A) Solid shank rivets
B) Blind rivets
C) Tapered rivets
A) Solid shank rivets
What is a major limitation of solid shank rivets?
A) They are weak in shear strength
B) They cannot be used in thick materials
C) They break easily
B) They cannot be used in thick materials
What is needed to make a riveted joint airtight or watertight?
A) A special kind of rivet
B) Sealants
C) Additional rivets
B) Sealants
Which of the following are the three types of riveted joints used in aircraft construction?
A) Lap joints, Flush joints, Joggle joints
B) Butt joints, Tension joints, Shear joints
C) Welded joints, Riveted joints, Bolted joints
A) Lap joints, Flush joints, Joggle joints
Which of the following factors govern the strength of a riveted joint?
A) Material Specification, Rivet Specification, Rivet Spacing
B) Rivet Color, Rivet Shape, Rivet Length
C) Joint Angle, Joint Type, Joint Temperature
A) Material Specification, Rivet Specification, Rivet Spacing
What is a key feature of lap joints in aircraft construction?
A) The skins are stacked, creating a distinct step or change in levels
B) The skins are perfectly smooth and flush with each other
C) They are used in areas requiring high aerodynamic smoothness
A) The skins are stacked, creating a distinct step or change in levels
Why are lap joints not aerodynamically smooth?
A) The skins are perfectly aligned
B) The skin edges disrupt airflow during flight
C) They are designed to reduce weight
B) The skin edges disrupt airflow during flight
Where are lap joints typically used in aircraft?
A) On high-performance, aerodynamic parts
B) On light aircraft, where smoothness is less critical
C) On aircraft wings only
B) On light aircraft, where smoothness is less critical
What happens to the skins in a lap joint?
A) They are placed in the same plane
B) They are riveted together with a gap between them
C) They are stacked with a distinct step or change in levels
C) They are stacked with a distinct step or change in levels
What type of aircraft typically uses lap joints?
A) Commercial airliners
B) Light aircraft
C) Military fighter jets
B) Light aircraft
What is the main purpose of using flush joints in aircraft construction?
A) To create a visible step between the skins
B) To maintain aerodynamic smoothness between two skins
C) To increase the thickness of the skins
B) To maintain aerodynamic smoothness between two skins
In a flush joint, how are the skins positioned?
A) The skins are stacked, creating a step
B) The skins are riveted on the same plane
C) The skins are placed with a gap between them
B) The skins are riveted on the same plane
How is aerodynamic smoothness maintained in a flush patch repair?
A) By using a doubler and riveting an insert of the same thickness as the skin
B) By overlapping the skins
C) By using thicker rivets
A) By using a doubler and riveting an insert of the same thickness as the skin
Eg patch repair
What is used in a flush joint repair to match the thickness of the skin?
A) A different type of rivet
B) A doubler and insert of the same thickness
C) A thicker piece of material
B) A doubler and insert of the same thickness
What is a joggle joint?
A) A combination of a flush and a lap joint
B) A joint that only uses rivets
C) A type of joint that creates a visible step
A) A combination of a flush and a lap joint
How does a joggle joint differ from a lap joint?
A) It creates a smooth surface, while a lap joint creates a step
B) It uses a different type of rivet
C) It is weaker than a lap joint
A) It creates a smooth surface, while a lap joint creates a step
How does a joggle joint help when fitting a doubler over another structure?
A) It prevents the doubler from being flush with the skin
B) It allows the doubler and the skin to be on the same plane
C) It makes the doubler thicker for added strength
B) It allows the doubler and the skin to be on the same plane
What does the pitch of a fastener refer to?
A) The length of the rivet
B) The distance between the centers of two adjacent fastener holes
C) The thickness of the material being fastened
B) The distance between the centers of two adjacent fastener holes
If the fastener nominal shank diameter is D, how is the pitch calculated?
A) Pitch = 2.0 x D
B) Pitch = D / 2
C) Pitch = 4.0 x D
C) Pitch = 4.0 x D
What does fastener edge margin refer to?
A) The distance between the center of the fastener hole and the nearest edge of a part
B) The distance between two adjacent fasteners
C) The total length of the fastener
A) The distance between the center of the fastener hole and the nearest edge of a part
What is the general rule of thumb for fastener edge margin?
A) 1D to 1.5D times the diameter of the rivet
B) 2D to 2.5D times the diameter of the rivet
C) 3D to 3.5D times the diameter of the rivet
B) 2D to 2.5D times the diameter of the rivet
What is edge distance in the context of fasteners?
A) The distance from the fastener hole center to the nearest edge of the material
B) The distance from the edge of the fastener hole to the edge of the plate
C) The overall length of the fastener
B) The distance from the edge of the fastener hole to the edge of the plate
What does spacing refer to in fastener installation?
A) The distance between two fasteners in the same row
B) The distance between fastener rows, measured from the hole centers
C) The thickness of the material being fastened
B) The distance between fastener rows, measured from the hole centers
What is the general rule of thumb for fastener spacing?
A) 2 to 3D
B) 4 to 5D
C) 6 to 7D
B) 4 to 5D
