FAA Airframe Questions

if the same quality wood is used in both.

1. Laminated wood spars may be substituted for solid rectangular wood spars

glue.

2. The strength of a well-designed and properly prepared wood splice joint is provided by the

AC 43.13-1B.

3. Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair?

a new section of spar should be spliced in or the spar replaced entirely.

4. In cases of elongated boltholes in a wood spar or cracks in the vicinity of boltholes,

compression failure.

5. A faint line running across the grain of a wood spar generally indicates

Decay is not acceptable in any form or amount.

6. Which statement about wood decay is correct?

Careful inspection fails to reveal any decay.

7. Which of the following conditions will determine acceptance of wood with mineral streaks?

reduce weight.

8. The I-beam wooden spar is routed to

they produce a small effect on grain direction.

9. Pin knot clusters are permitted in wood aircraft structure provided

no external bracing.

10. The cantilever wing uses

parallel grain construction.

11. Laminated wood is sometimes used in the construction of highly stressed aircraft components. This wood can be identified by its

circular or elliptical patches.

12. When patching a plywood skin, abrupt changes in cross-sectional areas which will develop dangerous stress concentration should be avoided by using

when a joint has separated and the glue surface shows only the imprint of the wood with no wood fibers clinging to the glue.

13. Glue deterioration in wood aircraft structure is indicated

at right angles to the grain.

14. Compression failures in wood aircraft structures are characterized by buckling of the fibers that appear as streaks on the surface

prevent the formation of oxides in the puddle.

1. In Gas Tungsten Arc (GTA) welding, a stream of inert gas is used to

Filler rod should be the same composition as base metal.

2. Which statement best describes magnesium welding?

The welded section does not have the strength of the original metal.

3. Which statement is true in regard to welding heat-treated magnesium?

neutral.

4. The oxyacetylene flame for silver soldering should be

To chemically clean the base metal of oxide film.

5. Why is it necessary to use flux in all silver soldering operations?

larger diameter tube with fishmouth and rosette welds.

6. Engine mount members should preferably be repaired by using a

Welded patch plate.

7. What method of repair is recommended for a steel tube longeron dented at a cluster?

not permitted.

8. Welding over brazed or soldered joints is

Joints in electric wire to be soldered should be mechanically secure prior to soldering.

9. Which statement concerning soldering is correct?

tinned.

10. A resurfaced soldering iron cannot be used effectively until after the working face has been

2

11. Which of the following can normally be welded without adversely affecting strength? 11. Which of the following can normally be welded without adversely affecting strength? 1. Aircraft bolts. 2. SAE 4130 chrome/molybdenum tubing. 3. Spring steel struts. 4. Most heat-treated steel/nickel alloy components.

amount of heat applied to the work.

12. In selecting a torch tip size to use in welding, the size of the tip opening determines the

It hardens the surface.

13. Why should a carburizing flame be avoided when welding steel?

material compatibility.

14. The most important consideration(s) when selecting welding rod is

be neutral and soft.

15. The oxyacetylene flame used for aluminum welding should

cool too rapidly.

16. A very thin and pointed tip on a soldering copper is undesirable because it will

a way to bring about strength reduction in joint.

17. Filing or grinding a weld bead is considered to be

dangerously unstable.

18. Acetylene at a line pressure above 15 PSI is

contain acetone.

19. Cylinders used to transport and store acetylene

a loose tip.

20. A welding torch backfire may be caused by

The inert-arc welding process uses an inert gas to protect the weld zone from the atmosphere.

21. Which statement concerning a welding process is true?

Painted on the surface to be welded and applied to the welding rod.

22. Where should the flux be applied when oxyacetylene welding aluminum?

Minimizes or prevents oxidation.

23. What purpose does flux serve in welding aluminum?

Reduces internal stresses and assures more complete penetration.

24. Why are aluminum plates 1/4 inch or more thick usually preheated before welding?

Slightly carburizing.

25. How should a welding torch flame be adjusted to weld stainless steel?

flux.

26. Oxides form very rapidly when alloys or metals are hot. It is important, therefore, when welding aluminum to use a

size of the tip opening.

27. In gas welding, the amount of heat applied to the material being welded is controlled by the

steel.

28. Oxygen and acetylene cylinders are made of

the penetration should be 100 percent of the thickness of the base metal.

29. When a butt welded joint is visually inspected for penetration,

removes stresses caused by forming.

30. Annealing of aluminum

aids in getting full penetration of the metal and prevents local distortion.

31. Edge notching is generally recommended in butt welding above a certain thickness of aluminum because it

the metal will absorb carbon and lose its resistance to corrosion.

32. If too much acetylene is used in the welding of stainless steel,

helium or argon, or a mixture of helium and argon.

33. The shielding gases generally used in the Gas Tungsten Arc (GTA) welding of aluminum consist of

contain acetone.

34. High pressure cylinders used to transport and store acetylene must

shear loads.

1. A well-designed rivet joint will subject the rivets to

number of locking collar grooves.

2. A main difference between Lockbolt/Huckbolt tension and shear fasteners (other than their application) is in the

by the manufacturer and do not require heat treatment before being driven.

3. Alloy 2117 rivets are heat treated

three times the thickness of the thickest sheet.

4. The general rule for finding the proper rivet diameter is

one and one-half times the diameter of the rivet shank.

5. The shop head of a rivet should be

they can be installed with ordinary hand tools.

6. One of the main advantages of Hi-Lok type fasteners over earlier generations is that

body diameter, type of head, and length of the fastener.

7. The markings on the head of a Dzus fastener identify the

hundredths of an inch.

8. The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud length is measured in

sixteenths of an inch.

9. The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in

attach parts or components with screws to sheet metal.

10. Threaded rivets (Rivnuts) are commonly used to

a pulling tool.

11. The installation of Cherrymax and Olympic-Lok rivets is accomplished by utilizing

possibility of causing delamination.

12. Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the

must be constructed of material such as titanium or corrosion resistant steel.

13. Metal fasteners used with carbon/graphite composite structures

has a high strength to weight ratio.

14. Sandwich panels made of metal honeycomb construction are used on modern aircraft because this type of construction

only No. 1 is true.

15. (1) When performing a ring (coin tap) test on composite structures, a change in sound may be due to damage or to transition to a different internal structure. 15. (1) When performing a ring (coin tap) test on composite structures, a change in sound may be due to damage or to transition to a different internal structure. (2) The extent of separation damage in composite structures is most accurately measured by a ring (coin tap) test. Regarding the above statements,

2 and 3.

16. Which of these methods may be used to inspect fiberglass/honeycomb structures for entrapped water? 16. Which of these methods may be used to inspect fiberglass/honeycomb structures for entrapped water? 1. Acoustic emission monitoring. 2. X-ray. 3. Backlighting.

the grain is perpendicular to the skin.

17. When balsa wood is used to replace a damaged honeycomb core, the plug should be cut so that

100 times the thickness of the metal.

18. When repairing puncture-type damage of a metal faced laminated honeycomb panel, the edges of the doubler should be tapered to

have mixed enough for a test sample.

19. One of the best ways to assure that a properly prepared batch of matrix resin has been achieved is to

By picking up the 'noise' of any deterioration that may be present.

20. How does acoustic emission testing detect defects in composite materials?

Prime the repair with a corrosion inhibitor and seal from the atmosphere.

21. What precaution, if any, should be taken to prevent corrosion inside a repaired metal honeycomb structure?

strip the damaged area of all paint and shine a strong light through the structure.

22. One method of inspecting a laminated fiberglass structure that has been subjected to damage is to

separation of the laminates.

23. When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate

2, 3, and 4.

24. How many of the following are benefits of using microballoons when making repairs to laminated honeycomb panels? 24. How many of the following are benefits of using microballoons when making repairs to laminated honeycomb panels? 1. Greater concentrations of resin in edges and corners. 2. Improved strength to weight ratio. 3. Less density 4. Lower stress concentrations

pot life.

25. The length of time that a catalyzed resin will remain in a workable state is called the

thermoplastic.

26. A category of plastic material that is capable of softening or flowing when reheated is described as a

S-glass.

27. The classification for high tensile strength fiberglass used in aircraft structures is

Zinc chloride will have no effect.

28. Which is an identifying characteristic of acrylic plastics?

one or more coats of suitable resin (room-temperature catalyzed) to the surface.

29. Superficial scars, scratches, surface abrasion, or rain erosion on fiberglass laminates can generally be repaired by applying

E-glass.

30. The classification for fiberglass reinforcement material that has high resistivity and is the most common is

1 inch in diameter.

31. A potted compound repair on honeycomb can usually be made on damages less than

Warp.

32. Composite fabric material is considered to be the strongest in what direction?

Warp clock (or compass).

33. What reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric?

the orientation of the plies to the load direction.

34. The strength and stiffness of a properly constructed composite buildup depends primarily on

60:40:00

35. Which fiber to resin (percent) ratio for advanced composite wet lay-ups is generally considered the best for strength?

Bleeder.

36. What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called?

1 and 4.

37. Proper pre-preg composite lay-up curing is generally accomplished by 37. Proper pre-preg composite lay-up curing is generally accomplished by 1. applying external heat. 2. room temperature exposure. 3. adding a catalyst or curing agent to the resin. 4. applying pressure.

use short strips of fiberglass in the bonded repair.

38. When repairing large, flat surfaces with polyester resins, warping of the surface is likely to occur. One method of reducing the amount of warpage is to

MEK (methyl ethyl ketone).

39. When making repairs to fiberglass, cleaning of the area to be repaired is essential for a good bond. The final cleaning should be made using

Water only.

40. When necessary, what type of cutting fluid is usually acceptable for machining composite laminates?

filling with a putty consisting of a compatible resin and clean, short glass fibers.

41. Fiberglass laminate damage not exceeding the first layer or ply can be repaired by

may be repaired.

42. Fiberglass damage that extends completely through a laminated sandwich structure

requires the replacement of the damaged core and facing.

43. Fiberglass laminate damage that extends completely through one facing and into the core

an unairworthy repair.

44. Repairing advanced composites using materials and techniques traditionally used for fiberglass repairs is likely to result in

laminating on new repair plies.

45. The preferred way to make permanent repairs on composites is by

2 and 3.

46. Which of the following, when added to wet resins, provide strength for the repair of damaged fastener holes in composite panels? 46. Which of the following, when added to wet resins, provide strength for the repair of damaged fastener holes in composite panels? 1. Microballoons. 2. Flox. 3. Chopped fibers.

ribbon direction.

47. The part of a replacement honeycomb core that must line up with the adjacent original is the

1 and 2.

48. Which of the following are generally characteristic of aramid fiber (Kevlar) composites? 48. Which of the following are generally characteristic of aramid fiber (Kevlar) composites? 1. High tensile strength. 2. Flexibility. 3. Stiffness. 4. Corrosive effect in contact with aluminum. 5. Ability to conduct electricity.

2, 3, and 4.

49. Which of the following are generally characteristic of carbon/graphite fiber composites? 49. Which of the following are generally characteristic of carbon/graphite fiber composites? 1. Flexibility. 2. Stiffness. 3. High compressive strength. 4. Corrosive effect in contact with aluminum. 5. Ability to conduct electricity.

crazing.

50. If an aircraft's transparent plastic enclosures exhibit fine cracks which may extend in a network over or under the surface or through the plastic, the plastic is said to be

tightened to a firm fit, then backed off one full turn.

51. When installing transparent plastic enclosures which are retained by bolts extending through the plastic material and self-locking nuts, the nuts should be

TSO C22.

52. If a new safety belt is to be installed in an aircraft, the belt must conform to the strength requirements in which document?