Airframe Orals (Jeppesen) || 100% Correct Answers.
What is the function of a vortex generator? correct answers Prevent separation of the
boundary layer.
What are the 3 axis of an airplane? correct answers - Longitudinal
- Lateral
- Vertical
What are the 3 primary flight controls of an aircraft? correct answers - Ailerons
- Elevator
- Rudder
What is the general purpose of secondary flight controls? correct answers Assist the pilot in
moving the controls and trim the aircraft to fly hands-off
Name several secondary flight controls correct answers - Trim tabs (balance tabs)
- Anti-servo
- Servo tabs
- Spring tabs
What is the general purpose of auxiliary flight controls? correct answers They are high-lift
devices used in low-speed flight to generate extra lift
Name several types of auxiliary flight controls & describe their general purpose. correct
answers - L/E + T/E flaps
- Slats
- Slots
- Speed brakes
What is a servo trim tab? correct answers An auxiliary control designed to create
aerodynamic forces to assist in moving a control surface.
What is a spring tab? correct answers An auxiliary control designed to aid movement of a
primary control at high speeds.
What is a balance trim tab? correct answers An auxiliary control which creates aerodynamic
forces to assist in moving a control surface. It's positioned by a control rod.
What are four most common types of high lift devices? correct answers - L/E + T/E flaps
- Slats
- Slots
Describe some of the tools used to check control surface travel. correct answers - Universal
propeller protractor
- Special control surface protractor
Name three mechanical methods by which flight control systems may be actuated. correct
answers - Cables
- Push-pull rods
,- Torque tubes
What is a fairlead? correct answers It's a device to prevent a cable from rubbing on the
aircraft structure. (A cable guide.)
What are the most likely places for a control cable to wear or break? correct answers Pulleys
and fairleads
What information is required before a cable rigging chart can be used? correct answers -
Ambient temperature
- Cable size
What is the function of a cable tension regulator? correct answers It automatically adjusts the
cable tension to compensate for expansion & contraction of the aircraft structure.
Describe the function of a rotorcraft collective pitch control. correct answers It causes each
rotor blade to change it's pitch angle equally, thus increasing or decreasing the lift produced
by the rotor.
Describe the function of a rotorcraft cyclic pitch control. correct answers It tilts the main
rotor disc by changing the pitch angle of each rotor blade, which causes the helicopter to
move in the direction of tilt.
What mechanism is most commonly used to compensate for the torque produced by the main
rotor of a helicopter? correct answers The tail rotor.
How is the amount of thrust produced by the tail rotor controlled? correct answers By moving
the foot pedals.
Why should control surfaces be locked when an aircraft is parked? correct answers To
prevent damage from the wind.
What is the major type of damage to aluminum structures that is caused by exposure to
weather? correct answers Corrosion.
Name several methods for forming sheet metal. correct answers - Bending (folding)
- Stretching
- Shrinking
- Bumping
- Crimping
What are the dimensions of a properly formed riveted head? correct answers Width = 1-1/2
shank dia, Hight - 1/2 the shank dia.
Describe the markings found on the heads of A, B, D, AD, & DD rivets. correct answers - A
= Plain
- B = Cross
- D = Raised dot
- AD = Dimpled
- DD = Double dash
, What happens to the stem of a self-plugging rivet when the rivet is installed? correct answers
It snaps off and is trimmed flush
Name at least 3 types of self-plugging mechanical lock rivets. correct answers - CherryMax
- CherryLock
- OlympicLok
What is the difference between the tools required to pull a CherryLock & a CherryMax rivet?
correct answers CherryLocks require a tool for each different size & head shape, while one
pulling tool will set any size CherryMax rivet.
Which of the five stresses is the most common cause of rivet failure? correct answers Shear.
If a 2024 rivet must be replaced with a 2117 rivet, how is the size to be used determined?
correct answers For 5/32" or smaller dia, use the next larger 2117 rivet
Describe the process for determining the total length of a solid rivet for a particular
installation. correct answers Material thickness(grip) plus 1-1/2 times the rivet dia.
What minimum edge distance should be used for protruding head rivets? correct answers At
least 2X rivet dia.
What is the minimum spacing that should be used for a single row of protruding head rivets?
correct answers At least 3x rivet dia. apart
How can a mechanic determine whether the countersink for a flush rivet should be dimpled
or drilled? correct answers Thickness of the top sheet
What action is taken to prevent cracks from forming while dimpling magnesium or some hard
sheet metals? correct answers Hot dimpling equipment is used
What type of damage can occur when using a rivet set that does not properly fit the rivet?
correct answers - Undersized > rivet head damage
- Oversized > sheet metal damage
Why is it important to use the proper size & weight bucking bar when performing sheet metal
riveting? correct answers If it's too heavy it can be difficult to control & may damage the
surrounding structure. If it's too light it will not properly up-set the rivet before work
hardening.
What procedures should be followed to properly remove a solid shank rivet? correct answers
- Punch the rivet
- Drill to base of head (one size smaller bit)
- Use a pin punch to tip the rivet head off
- Drive the rest of the shank out
What two special calculations must be made when bending sheet metal? correct answers -
Bend allowance
- Setback
What is the function of a vortex generator? correct answers Prevent separation of the
boundary layer.
What are the 3 axis of an airplane? correct answers - Longitudinal
- Lateral
- Vertical
What are the 3 primary flight controls of an aircraft? correct answers - Ailerons
- Elevator
- Rudder
What is the general purpose of secondary flight controls? correct answers Assist the pilot in
moving the controls and trim the aircraft to fly hands-off
Name several secondary flight controls correct answers - Trim tabs (balance tabs)
- Anti-servo
- Servo tabs
- Spring tabs
What is the general purpose of auxiliary flight controls? correct answers They are high-lift
devices used in low-speed flight to generate extra lift
Name several types of auxiliary flight controls & describe their general purpose. correct
answers - L/E + T/E flaps
- Slats
- Slots
- Speed brakes
What is a servo trim tab? correct answers An auxiliary control designed to create
aerodynamic forces to assist in moving a control surface.
What is a spring tab? correct answers An auxiliary control designed to aid movement of a
primary control at high speeds.
What is a balance trim tab? correct answers An auxiliary control which creates aerodynamic
forces to assist in moving a control surface. It's positioned by a control rod.
What are four most common types of high lift devices? correct answers - L/E + T/E flaps
- Slats
- Slots
Describe some of the tools used to check control surface travel. correct answers - Universal
propeller protractor
- Special control surface protractor
Name three mechanical methods by which flight control systems may be actuated. correct
answers - Cables
- Push-pull rods
,- Torque tubes
What is a fairlead? correct answers It's a device to prevent a cable from rubbing on the
aircraft structure. (A cable guide.)
What are the most likely places for a control cable to wear or break? correct answers Pulleys
and fairleads
What information is required before a cable rigging chart can be used? correct answers -
Ambient temperature
- Cable size
What is the function of a cable tension regulator? correct answers It automatically adjusts the
cable tension to compensate for expansion & contraction of the aircraft structure.
Describe the function of a rotorcraft collective pitch control. correct answers It causes each
rotor blade to change it's pitch angle equally, thus increasing or decreasing the lift produced
by the rotor.
Describe the function of a rotorcraft cyclic pitch control. correct answers It tilts the main
rotor disc by changing the pitch angle of each rotor blade, which causes the helicopter to
move in the direction of tilt.
What mechanism is most commonly used to compensate for the torque produced by the main
rotor of a helicopter? correct answers The tail rotor.
How is the amount of thrust produced by the tail rotor controlled? correct answers By moving
the foot pedals.
Why should control surfaces be locked when an aircraft is parked? correct answers To
prevent damage from the wind.
What is the major type of damage to aluminum structures that is caused by exposure to
weather? correct answers Corrosion.
Name several methods for forming sheet metal. correct answers - Bending (folding)
- Stretching
- Shrinking
- Bumping
- Crimping
What are the dimensions of a properly formed riveted head? correct answers Width = 1-1/2
shank dia, Hight - 1/2 the shank dia.
Describe the markings found on the heads of A, B, D, AD, & DD rivets. correct answers - A
= Plain
- B = Cross
- D = Raised dot
- AD = Dimpled
- DD = Double dash
, What happens to the stem of a self-plugging rivet when the rivet is installed? correct answers
It snaps off and is trimmed flush
Name at least 3 types of self-plugging mechanical lock rivets. correct answers - CherryMax
- CherryLock
- OlympicLok
What is the difference between the tools required to pull a CherryLock & a CherryMax rivet?
correct answers CherryLocks require a tool for each different size & head shape, while one
pulling tool will set any size CherryMax rivet.
Which of the five stresses is the most common cause of rivet failure? correct answers Shear.
If a 2024 rivet must be replaced with a 2117 rivet, how is the size to be used determined?
correct answers For 5/32" or smaller dia, use the next larger 2117 rivet
Describe the process for determining the total length of a solid rivet for a particular
installation. correct answers Material thickness(grip) plus 1-1/2 times the rivet dia.
What minimum edge distance should be used for protruding head rivets? correct answers At
least 2X rivet dia.
What is the minimum spacing that should be used for a single row of protruding head rivets?
correct answers At least 3x rivet dia. apart
How can a mechanic determine whether the countersink for a flush rivet should be dimpled
or drilled? correct answers Thickness of the top sheet
What action is taken to prevent cracks from forming while dimpling magnesium or some hard
sheet metals? correct answers Hot dimpling equipment is used
What type of damage can occur when using a rivet set that does not properly fit the rivet?
correct answers - Undersized > rivet head damage
- Oversized > sheet metal damage
Why is it important to use the proper size & weight bucking bar when performing sheet metal
riveting? correct answers If it's too heavy it can be difficult to control & may damage the
surrounding structure. If it's too light it will not properly up-set the rivet before work
hardening.
What procedures should be followed to properly remove a solid shank rivet? correct answers
- Punch the rivet
- Drill to base of head (one size smaller bit)
- Use a pin punch to tip the rivet head off
- Drive the rest of the shank out
What two special calculations must be made when bending sheet metal? correct answers -
Bend allowance
- Setback
