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ACRM > ACRM (NONMETALLIC) > Flashcards

ACRM (NONMETALLIC) Flashcards

1
Q

Used for some aircraft wing spars and is made of one solid piece cut from a log.

A

WOOD

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2
Q

Made of two or three pieces of thin wood glued together with the grain running in the same direction.

A

LAMINATED WOOD

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3
Q

Consists of three or more layers of thin veneer glued together so the grain of each successive layer crosses the others at an angle of 45 degrees or 90 degrees.

A

PLYWOOD

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4
Q

Come from deciduous trees having broad leaves

A

HARDWOOD

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5
Q

Come from coniferous trees with needle-like or scale-like leaves.

A

SOFTWOOD

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6
Q

Most common wood used in aircraft structures. Reference wood for aircraft construction.

A

SITKA SPRUCE

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7
Q

Maximum deviation of GRAIN DEVIATION

A

1:15

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8
Q

Identifies a point where a branch grew from the tree trunk. It weakens a board and are not acceptable in wood for aircraft construction or repair.

A

KNOT

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9
Q

Hard knots up to ______ inch at their maximum dimension are acceptable in aircraft wood.

A

⅜

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10
Q

are acceptable if they do not cause excessive grain deviation.

A

SMALL PIN-KNOT CLUSTERS

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11
Q

Small openings within the annual rings of a tree can fill with resin and form ____
Weakens a piece of wood slightly and are acceptable only in the center portion of a beam.

A

PITCH POCKET

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12
Q

If a tree leans in its growth, its annual rings are not concentric. Cannot be used in aircraft construction or repair.

A

COMPRESSION WOOD

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13
Q

Occurs when a tree falls and must not be confused with compression wood.

A

COMPRESSION FAILURE

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14
Q

Crack that runs across the annual rings of a board and occurs during the seasoning process.

A

CHECKS

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15
Q

Crack or separation that occurs when two annual rings separate along their boundary.

A

SHAKES

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16
Q

Lengthwise separation of the wood caused by the wood fibers tearing apart.

A

SPLITS

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17
Q

Caused by fungi that grow in damp wood.

A

DECAY

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18
Q

Hard in their normal state, but become soft and pliable when heated. When softened, it can be molded and shaped, and retain their shape when cooled.

A

THERMOPLASTIC RESINS

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19
Q

Transparent and light weight. However, it has a tendency to shrink and turn yellow.
When acetone is applied, it shrinks.

A

CELLULOSE ACETATE

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20
Q

Stiffer than cellulose acetate, more transparent and colorless. It burns with a clear flame and produces a fairly pleasant odor. If acetone is applied, it leaves a white residue but remains hard.

A

ACRYLIC

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21
Q

Usually have little strength in themselves and are generally used to impregnate linen, paper, or glass cloth. For example, both fiberglass cloth and mat have a great deal of strength for their weight, but lacks rigidity.

A

THERMOSETTING RESIN

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22
Q

To convert fiberglass into a useful structural material, it is impregnated with ____________ and molded into a desired form.

A

POLYSTER RESIN

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23
Q

cure by chemical action and differ from materials that cure by evaporation of an oil or solvent.

A

POLYESTERs

24
Q

added to polyester resin to thin it and make it more workable.

A

STYRENE MONOMER

25
Q

Extend their working time (pot life)

A

INHIBITORS

26
Q

To initiate curing process, to suppress inhibitors.

A

CATALYSTS

27
Q

To shorten the curing process, helps the catalysts.

A

ACCELERATORS

28
Q

Low percentage of shrinkage, high strength for its weight, and the ability to adhere to a wide variety of materials.

A

EPOXY RESIN

29
Q

Added to the resin to increase its viscosity.

A

THIXOTROPIC AGENTS

30
Q

Among the more familiar thixotropic agents used in aviation maintenance are

A

MICROBALLOONS

31
Q

When layers of paper are impregnated with a thermosetting resin such as phenol-formaldehyde or urea-formaldehyde, they can be molded into either flat sheets or complex shapes.

A

REINFORCING MATERIALS

32
Q

Enhances the strength and durability of thermosetting resin.

A

GLASS FIBER

33
Q

Form of glass fiber designed for use in high-temperature applications. It can withstand temperatures approaching 3,000F.

A

CERAMIC FIBER

34
Q

Most commonly used cloth reinforcing fabrics. Soft yellow organic fiber that is extremely light, strong, and tough.

A

KEVLAR

35
Q

Produces a change in the fiber’s molecular structure that makes it extremely lightweight, strong, and tough.

A

GRAPHITE FIBERS

36
Q

To increase the strength and rigidity of many nonmetallic structures. Some of the more common core materials include honeycomb, aluminum, wood, and metal faced honeycomb.

A

LAMINATED STRUCTURAL MATERIALS

37
Q

The cellular core for laminated honeycomb material may be made of

A

RESIN-IMPREGNATED PAPER / GLASS CLOTH

38
Q

Most wood cores consist of ________ _______ that has been cut across its grain and the end-grain slabs bonded between two face sheets of fiberglass or metal.

A

BALSA WOOD

39
Q

Honeycomb materials used in fiberglass laminations, the type of core is referred to as

A

METAL FACED HONEYCOMB

40
Q

Serve both to retain fluids in their operating systems and to exclude air and contaminants. However, with the increased use of high pressure fluid systems, packings and gaskets must also be able to perform under a wide range of operating pressures and temperatures.

A

SEALS OR PACKINGS

41
Q

Effectively seal in both directions and are used to prevent both internal and external leakage.

A

O-RING PACKINGS

42
Q

re used with o-rings to prevent the o-ring from being forced out, or extruded, they are made of teflon.

A

BACKUP RINGS

43
Q

One-way seals that are installed with the open end of the “V” facing the pressure.

A

V-RING PACKINGS / CHEVRON

44
Q

Used in brake assemblies and brake master cylinders.

A

U-RING PACKINGS

45
Q

Absorb the shock loads associated with landing, some older aircraft utilize shock absorber cord.

A

SHOCK ABSORBER CORD

46
Q

Used in fluid systems around the end caps of actuating cylinders, valves, and other units.

A

GASKETS

47
Q

Commonly used for spark plug gaskets and some hydraulic fittings.

A

SOLID COPPER WASHER

48
Q

Used in areas such as between an engine crankcase and accessories.

A

CORK GASKETS

49
Q

Used anywhere a compressible gasket is required. Its flexibility allows it to compress easily to provide a tight seal. Stay away from gasoline, oil, or some hydraulic fluids.

A

RUBBER SHEETING

50
Q

Clean and lubricate the exposed portions of piston shafts.

A

WIPERS

51
Q

Certain areas of all aircraft are sealed to withstand pressurization, prevent fuel leakage or passage of fumes, or to prevent corrosion by sealing against the weather.

A

SEALING COMPOUNDS

52
Q

Ready for application as packaged.

A

ONE-PART SEALNT

53
Q

Compounds requiring separate packaging to prevent curing prior to application.

A

TWO-PART SEALANT

54
Q

Used for fuel tank sealant, resists deterioration from jet fuel.

A

PRC SEALANT

55
Q
A

ACRM (8 decks)

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