Aircraft Structural Assembly and Rigging

Question 1

Nam several secondary flight controls and describe their general purpose.

Answer 1

trim tabs, balance tabs, anti-servo and servo tabs, spring tabs. Assist pilot in moving the controls and fly hands off.

Question 2

Auxiliary flight controls

Answer 2

flaps, slats, slots, speed-brakes.

Question 3

what is a spring tab?

Answer 3

it is an auxiliary control designed to aid the movement of a primary control at high speeds

Question 4

what is a balance trim tab

Answer 4

auxiliary control designed to assist in moving the control surfaces. on same side as the horn on the tab.

Question 5

4 most common high lift devices

Answer 5

leading and trailing flaps, slats, slots.

Question 6

tools used to check control surface travel

Answer 6

universal propeller protractor or special control surface protractor.

Question 7

3 mechanical methods by which flight control systems may be actuated.

Answer 7

cables, push-pull rods, torque tubes.

Question 8

what information is required before a cable rigging chart can be used

Answer 8

ambient temperature and the cable size

Question 9

what is the difference between the tools required to pull a CherryLOCK rivet and a CherryMAX rivet?

Answer 9

a cherrylock rivet needs a separate tool for each individual size.

Question 10

Describe the process for determining the total length of a solid rivet for a particular installation.

Answer 10

add the grip length plus 1 1/12 times the rivet diameter.

Question 11

what minimum edge distance and spacing should be used for a single row of protruding head rivets?

Answer 11

not less than two rivet diameters from the edge and not less than three rivet diameters apart.

Question 12

what factors must be considered in order to determine set back?

Answer 12

the thickness of the metal and the bend radius.

Question 13

name at least four different types of defects found in wood.

Answer 13

knots, checks, splits, decay, dry rot.

Question 14

what are the three types of glues used in modern aircraft construction and repair?

Answer 14

resorcinol glue, phenol-formaldehyde glue, and epoxy resin glue.

Question 15

in what areas are splices to a wood spar prohibited?

Answer 15

under an attachment fitting for the wing root, landing gear, engine-mount, lift, or inter-plane strut.

Question 16

what are the two primary uses for plywood in aircraft construction?

Answer 16

gusset plates and aircraft skin.

Question 17

provide examples of at least three types of plywood skin repairs.

Answer 17

splayed patches, surface patches, plug patches, and scarfed patches.

Question 18

what type of patch should be used to repair small holes in thin plywood skin if the skin is less than 1/10th inch thick?

Answer 18

a splayed patch if the hole can be cleared out to a 15th thickness of the skin.

Question 19

what should be done to prevent a plywood patch and the pressure plate from sticking together if glue is extruded from the join?

Answer 19

place a piece of waxed paper or vinyl plastic between the patch and the pressure plate.

Question 20

what re the most common causes for delamitation of a composite structure?

Answer 20

sonic vibration, expansion of internal moisture, liquid leakage, and a manufacturing error.

Question 21

name some of the factors that cause crazing in transparent plastic windows and windshields?

Answer 21

ultraviolet light, stress, solvents, and improper handling

Question 22

how should a hole be drilled in plexiglas to avoid damage to the hole when the drill breaks through to the underside?

Answer 22

back up the plastic with a piece of wood and feed the drill slowly.

Question 23

what is the purpose of shielding an arc weld with an inert gas?

Answer 23

the gas prevents atmospheric oxygen and nitrogen from contaminating the weld.

Question 24

what is the purpose of flux used with brazing and silver soldering?

Answer 24

the flux cleans the base metal by removing any oxide film.

Question 25

how are the fabric type and strength requirements determined for fabric-covered aircraft?

Answer 25

the original manufacturer determines the fabric type, and the strength requirements are a function of the never-exceed speed and wing loading.

Question 26

what types of synthetic fibers are used for covering aircraft?

Answer 26

fiberglass and heat-shrinkable polyester fibers.

Question 27

what is the function or purpose of reinforcing tape?

Answer 27

reinforcing tape is used between the fabric and the rib stitching to preventing the lacing cord from cutting through the fabric.

Question 28

where would you use surface tape?

Answer 28

over rip stitching and sewed seams, over lapped edges, around corners, and along leading and trailing edges.

Question 29

how should the edges of drainage, inspection, and ventilation holes be reinforced?

Answer 29

with plastic, aluminum, or brass grommets.

Question 30

what are the principle methods used to test the condition of fabric?

Answer 30

punch testers such as the maule or seybolt tester, and laboratory pull-testing.