M7.8 Flashcards
- 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
What does the sphere of influence refer to in rivet installation?
A) The area of sheet metal where a rivet can be installed
B) The area of sheet metal over which a rivet achieves a watertight joint
C) The total size of the rivet head
B) The area of sheet metal over which a rivet achieves a watertight joint
Typically, what is the radius of the sphere of influence for a rivet?
A) 5D
B) 2D
C) 10D
A) 5D
What is the purpose of a bucking bar in rivet installation?
A) To hold the rivet in place while it is installed
B) To set the shop head (tail) of the rivet
C) To cut the rivet to the required length
B) To set the shop head (tail) of the rivet
What material is typically used for a bucking bar?
A) Wood
B) Plastic
C) Steel
C) Steel
What is the most important consideration for the face of a bucking bar?
A) It should be smooth and resistant to indentation, but not too hard to avoid shattering
B) It should be made of rubber to absorb vibrations
C) It should have a rough surface to grip the rivet better
A) It should be smooth and resistant to indentation, but not too hard to avoid shattering
What is the typical air pressure range that a pneumatic rivet gun operates at?
A) 50 - 60 PSI
B) 92 - 99 PSI
C) 100 - 120 PSI
B) 92 - 99 PSI
Why should a rivet gun never be pointed at anyone?
A) It can damage the rivet set
B) It can cause personal injury
C) It can affect the accuracy of the rivet placement
B) It can cause personal injury
What should be done when the rivet gun is not in use for an extended period?
A) Store it with the air hose attached
B) Disconnect the air hose from the rivet gun
C) Keep the gun turned on for future use
B) Disconnect the air hose from the rivet gun
What is the typical range of blows per minute for a pneumatic rivet gun?
A) 500 to 1000 blows per minute
B) 900 to 2500 blows per minute
C) 3000 to 5000 blows per minute
B) 900 to 2500 blows per minute
What are the two types of yokes used in riveting squeezers?
A) Cyoke and alligator yoke
B) Flat and round yoke
C) Fixed and adjustable yoke
A) Cyoke and alligator yoke
What is the purpose of skin pins in aircraft repair?
A) To permanently fasten the sheets of metal together
B) To temporarily hold sheets of metal together during repair or modification
C) To drill holes in the metal
B) To temporarily hold sheets of metal together during repair or modification
Where are skin pins typically placed on the workpieces?
A) At every third or fourth rivet hole
B) At every second or third rivet hole
C) At every first and last rivet hole
B) At every second or third rivet hole
Which types of pins are most commonly used in aircraft skin repair?
A) Cleco Fasteners and Gripper Pins
B) Rivet Pins and Locking Pins
C) Bolts and Screws
A) Cleco Fasteners and Gripper Pins
Why should shear-head rivets not be shaved?
A) It could make the rivet head too soft
B) It reduces the effectiveness and strength of the rivet
C) It causes the rivet to break
B) It reduces the effectiveness and strength of the rivet
What is the most commonly used angle for countersink tools?
A) 82°
B) 100°
C) 120°
B) 100°
What does chattering during freehand countersinking result in?
A) A smooth and precise hole
B) A rough surface finish and imprecise hole
C) Faster drilling times
B) A rough surface finish and imprecise hole
When is freehand countersinking required?
A) When using a microstop countersink
B) When the microstop countersink cannot fit
C) When a pilot is too large
B) When the microstop countersink cannot fit
What is the preferred tool for countersinking?
A) Freehand countersink
B) Microstop countersink
C) Drill press
B) Microstop countersink
What is the requirement for the pilot in a microstop countersink tool?
A) The pilot must be the same size as the hole
B) The pilot must be slightly smaller than the hole
C) The pilot must be larger than the hole
B) The pilot must be slightly smaller than the hole
What type of material is dimpling used on?
A) Thick materials
B) Hard metals
C) Thin materials
C) Thin materials
Remember it’s only for countersunk heads
What is used to shape the material when dimpling?
A) Male and female die (punch and die set)
B) Hammer and chisel
C) Drill press
A) Male and female die (punch and die set)
What are the three methods of dimpling?
A) Coin dimpling, Radius dimpling, Hot dimpling
B) Hammer dimpling, Punch dimpling, Heat dimpling
C) Smooth dimpling, Rough dimpling, Deep dimpling
A) Coin dimpling, Radius dimpling, Hot dimpling(hard materials)
What tool can be used to check the condition of a driven rivet head?
A) A rivet gauge
B) A hammer
C) A file
A) A rivet gauge
What should be done if a rivet does not meet the prescribed standard?
A) It should be left in place
B) It should be replaced with the next larger size
C) It should be shaved down to size
B) It should be replaced with the next larger size
What is an unacceptable fault in a rivet head?
A) A smooth surface
B) Cracks in the rivet head
C) Slight misalignment
B) Cracks in the rivet head
What part of a rivet does the rivet shaver take off ?
A) shank
B) tail
C) head
C) head
