Airframe Oral
Questions
1. What is the function of a vortex generator?: It is designed to delay or prevent
separation of the boundary layer.
2. What are the three axes of an airplane?: Longitudinal. lateral. and vertical.
3. What are the three primary flight controls of an aircraft?: The ailerons.
elevator. and rudder.
4. Name several secondary flight controls and describe their general
purpose?-
: Secondary flight controls consist of various types to trim tabs such as balance tabs. anti-servo and
servo tabs. and spring tabs. Their function is to assist the pilot in moving the controls and to trim the
aircraft to fly hands-ott.
5. Name several types of auxiliary flight controls and describe their
general purpose?: The auxiliary flight controls consist of the various high-lift devices used during
low-speed flight such as leading and trailing edge flaps. slats. slots. speed brakes. etc.
6. What is a servo trim tab?: It is an auxiliary control. positioned by the movement of a
cockpit control and designed to create aerodynamic forces to assist in moving a control surface.
7. What is a spring tab?: It is an auxiliary control designed to aid the movement of a primary
control at high speeds when control forces become too high.
8. What is a balance trim tab?: It is an auxiliary control designed to create aerodynamic
forces to assist in moving a control surface. The tab is positioned by a control rod connected to the
fixed surface on the same side as the horn on the tab.
9. What are four most common types of high lift devices?: Leading and
trailing edge flaps.
slats. and slots.
10. Describe some of the tools used to check control surface
travel?: A universal propeller protractor or special control surface protractor.
11. Name three mechanical methods by which flight control
systems may be actuated.: Cables. push-pull rods. and torque tubes.
12. What is a fairlead?: It is a device to prevent a cable from rubbing on the aircraft
structure.
13. What are the most likely places for a control cable to wear or
break?: Where the cables pass over pulleys or through fairleads.
14. What information is required before a cable rigging chart can
be used?: The ambient temperature and the cable size.
, Airframe Oral
Questions
15. What is the function of a cable tension regulator?: It automatically adjusts
the cable tension to compensate for expansion and contraction in the aircraft structure.
, Airframe Oral
Questions
16. Describe the function of a rotorcraft collective pitch control.: The
collective control causes each rotor blade to change its pitch angle by the same amount. thus
increasing or decreasing the lift produced by the rotor.
17. Describe the function of a rotorcraft cyclic pitch control.: The cyclic
control tilts the main
rotor disc by changing the pitch angle of each rotor blade during its cycle of rotation. which causes the
helicopter to move in the direction the rotor tilts.
18. What mechanism is most commonly used to compensate for
the torque
produced by the main rotor of a helicopter?: The tail (or anti-torque) rotor.
19. How is the amount of thrust produced by the tail rotor
controlled?: By moving the foot pedals.
20. Why should control surfaces be locked when an aircraft is
parked?: To prevent damage from the wind.
21. What is the major type of damage to aluminum structures that
is caused by exposure to the weather?: Corrosion
22. Name several methods for forming sheet metal?: Bending or folding.
stretching. shrinking. bumping. and crimping.
23. What are the dimensions of a properly formed rivet head?: The
head should be 1 1/2 times the shank diameter in width and ½ the shank diameter in height.
24. Describe the markings found on the heads of A. B. D. AD. and
DD rivets.: A rivets are plain. B rivets have a cross. D rivets have a raised dot. AD rivets have a
dimple. and DD rivets have a double dash.
25. What happens to the stem of a self-plugging (friction lock) rivet
when the
rivet is installed?: The stem is pulled until it snaps ott and the remaining projecting part is
trimmed flush with the head.
26. Name at least three types of self-plugging mechanical lock
rivets.: CherryMax. CherryLock. Olympic-locs. andHuck.
27. What is the difference between the tools required to pull a
CherryLock rivet and a CherryMax rivet?: CherryLock rivets require a tool for each
ditterent size and head shape. while one pulling tool will set any size Cherry Max rivet.
28. Which of the five stresses is the most common cause of rivet
, Airframe Oral
Questions
failure?: Shear
Questions
1. What is the function of a vortex generator?: It is designed to delay or prevent
separation of the boundary layer.
2. What are the three axes of an airplane?: Longitudinal. lateral. and vertical.
3. What are the three primary flight controls of an aircraft?: The ailerons.
elevator. and rudder.
4. Name several secondary flight controls and describe their general
purpose?-
: Secondary flight controls consist of various types to trim tabs such as balance tabs. anti-servo and
servo tabs. and spring tabs. Their function is to assist the pilot in moving the controls and to trim the
aircraft to fly hands-ott.
5. Name several types of auxiliary flight controls and describe their
general purpose?: The auxiliary flight controls consist of the various high-lift devices used during
low-speed flight such as leading and trailing edge flaps. slats. slots. speed brakes. etc.
6. What is a servo trim tab?: It is an auxiliary control. positioned by the movement of a
cockpit control and designed to create aerodynamic forces to assist in moving a control surface.
7. What is a spring tab?: It is an auxiliary control designed to aid the movement of a primary
control at high speeds when control forces become too high.
8. What is a balance trim tab?: It is an auxiliary control designed to create aerodynamic
forces to assist in moving a control surface. The tab is positioned by a control rod connected to the
fixed surface on the same side as the horn on the tab.
9. What are four most common types of high lift devices?: Leading and
trailing edge flaps.
slats. and slots.
10. Describe some of the tools used to check control surface
travel?: A universal propeller protractor or special control surface protractor.
11. Name three mechanical methods by which flight control
systems may be actuated.: Cables. push-pull rods. and torque tubes.
12. What is a fairlead?: It is a device to prevent a cable from rubbing on the aircraft
structure.
13. What are the most likely places for a control cable to wear or
break?: Where the cables pass over pulleys or through fairleads.
14. What information is required before a cable rigging chart can
be used?: The ambient temperature and the cable size.
, Airframe Oral
Questions
15. What is the function of a cable tension regulator?: It automatically adjusts
the cable tension to compensate for expansion and contraction in the aircraft structure.
, Airframe Oral
Questions
16. Describe the function of a rotorcraft collective pitch control.: The
collective control causes each rotor blade to change its pitch angle by the same amount. thus
increasing or decreasing the lift produced by the rotor.
17. Describe the function of a rotorcraft cyclic pitch control.: The cyclic
control tilts the main
rotor disc by changing the pitch angle of each rotor blade during its cycle of rotation. which causes the
helicopter to move in the direction the rotor tilts.
18. What mechanism is most commonly used to compensate for
the torque
produced by the main rotor of a helicopter?: The tail (or anti-torque) rotor.
19. How is the amount of thrust produced by the tail rotor
controlled?: By moving the foot pedals.
20. Why should control surfaces be locked when an aircraft is
parked?: To prevent damage from the wind.
21. What is the major type of damage to aluminum structures that
is caused by exposure to the weather?: Corrosion
22. Name several methods for forming sheet metal?: Bending or folding.
stretching. shrinking. bumping. and crimping.
23. What are the dimensions of a properly formed rivet head?: The
head should be 1 1/2 times the shank diameter in width and ½ the shank diameter in height.
24. Describe the markings found on the heads of A. B. D. AD. and
DD rivets.: A rivets are plain. B rivets have a cross. D rivets have a raised dot. AD rivets have a
dimple. and DD rivets have a double dash.
25. What happens to the stem of a self-plugging (friction lock) rivet
when the
rivet is installed?: The stem is pulled until it snaps ott and the remaining projecting part is
trimmed flush with the head.
26. Name at least three types of self-plugging mechanical lock
rivets.: CherryMax. CherryLock. Olympic-locs. andHuck.
27. What is the difference between the tools required to pull a
CherryLock rivet and a CherryMax rivet?: CherryLock rivets require a tool for each
ditterent size and head shape. while one pulling tool will set any size Cherry Max rivet.
28. Which of the five stresses is the most common cause of rivet
, Airframe Oral
Questions
failure?: Shear
