Airframe FAA question bank no pass

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

if the same quality wood is used in both.

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

glue.

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

AC 43.13-1B.

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

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

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

compression failure.

6. Which statement about wood decay is correct?

Decay is not acceptable in any form or amount.

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

Careful inspection fails to reveal any decay.

8. The I-beam wooden spar is routed to

reduce weight.

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

they produce a small effect on grain direction.

10. The cantilever wing uses

no external bracing.

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

parallel grain construction.

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

circular or elliptical patches.

13. Glue deterioration in wood aircraft structure is indicated

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

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

at right angles to the grain.

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

prevent the formation of oxides in the puddle.

2. Which statement best describes magnesium welding?

Filler rod should be the same composition as base metal.

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

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

4. The oxyacetylene flame for silver soldering should be

neutral.

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

To chemically clean the base metal of oxide film.

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

larger diameter tube with fishmouth and rosette welds.

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

Welded patch plate.

8. Welding over brazed or soldered joints is

not permitted.

9. Which statement concerning soldering is correct?

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

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

tinned.

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.

2

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

amount of heat applied to the work.

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

It hardens the surface.

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

material compatibility.

15. The oxyacetylene flame used for aluminum welding should

be neutral and soft.

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

cool too rapidly.

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

a way to bring about strength reduction in joint.

18. Acetylene at a line pressure above 15 PSI is

dangerously unstable.

19. Cylinders used to transport and store acetylene

contain acetone.

20. A welding torch backfire may be caused by

a loose tip.

21. Which statement concerning a welding process is true?

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

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

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

23. What purpose does flux serve in welding aluminum?

Minimizes or prevents oxidation.

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

Reduces internal stresses and assures more complete penetration.

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

Slightly carburizing.

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

flux.

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

size of the tip opening.

28. Oxygen and acetylene cylinders are made of

steel.

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

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

30. Annealing of aluminum

removes stresses caused by forming.

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

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

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

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

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

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

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

contain acetone.

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

shear loads.

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

number of locking collar grooves.

3. Alloy 2117 rivets are heat treated

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

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

three times the thickness of the thickest sheet.

5. The shop head of a rivet should be

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

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

they can be installed with ordinary hand tools.

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

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

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

hundredths of an inch.

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

sixteenths of an inch.

10. Threaded rivets (Rivnuts) are commonly used to

attach parts or components with screws to sheet metal.

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

a pulling tool.

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

possibility of causing delamination.

13. Metal fasteners used with carbon/graphite composite structures

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

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

has a high strength to weight ratio.

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,

only No. 1 is true.

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.

2 and 3.

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

the grain is perpendicular to the skin.

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

100 times the thickness of the metal.

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

have mixed enough for a test sample.

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

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

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

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

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

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

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

separation of the laminates.

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

2, 3, and 4.

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

pot life.

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

thermoplastic.

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

S-glass.

28. Which is an identifying characteristic of acrylic plastics?

Zinc chloride will have no effect.

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

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

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

E-glass.

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

1 inch in diameter.

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

Warp.

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

Warp clock (or compass).

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

the orientation of the plies to the load direction.

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

60:40:00

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

Bleeder.

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.

1 and 4.

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

use short strips of fiberglass in the bonded repair.

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

MEK (methyl ethyl ketone).

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

Water only.

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

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

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

may be repaired.

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

requires the replacement of the damaged core and facing.

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

an unairworthy repair.

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

laminating on new repair plies.

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.

2 and 3.

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

ribbon direction.

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.

1 and 2.

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.

2, 3, and 4.

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

crazing.

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

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

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

TSO C22.