ACRM (NONMETALLIC)

Question 1

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

Answer 1

WOOD

Question 2

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

Answer 2

LAMINATED WOOD

Question 3

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.

Answer 3

PLYWOOD

Question 4

Come from deciduous trees having broad leaves

Answer 4

HARDWOOD

Question 5

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

Answer 5

SOFTWOOD

Question 6

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

Answer 6

SITKA SPRUCE

Question 7

Maximum deviation of GRAIN DEVIATION

Answer 7

1:15

Question 8

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.

Answer 8

KNOT

Question 9

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

Answer 9

⅜

Question 10

are acceptable if they do not cause excessive grain deviation.

Answer 10

SMALL PIN-KNOT CLUSTERS

Question 11

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.

Answer 11

PITCH POCKET

Question 12

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

Answer 12

COMPRESSION WOOD

Question 13

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

Answer 13

COMPRESSION FAILURE

Question 14

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

Answer 14

CHECKS

Question 15

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

Answer 15

SHAKES

Question 16

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

Answer 16

SPLITS

Question 17

Caused by fungi that grow in damp wood.

Answer 17

DECAY

Question 18

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.

Answer 18

THERMOPLASTIC RESINS

Question 19

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

Answer 19

CELLULOSE ACETATE

Question 20

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.

Answer 20

ACRYLIC

Question 21

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.

Answer 21

THERMOSETTING RESIN

Question 22

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

Answer 22

POLYSTER RESIN

Question 23

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

Answer 23

POLYESTERs

Question 24

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

Answer 24

STYRENE MONOMER

Question 25

Extend their working time (pot life)

Answer 25

INHIBITORS

Question 26

To initiate curing process, to suppress inhibitors.

Answer 26

CATALYSTS

Question 27

To shorten the curing process, helps the catalysts.

Answer 27

ACCELERATORS

Question 28

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

Answer 28

EPOXY RESIN

Question 29

Added to the resin to increase its viscosity.

Answer 29

THIXOTROPIC AGENTS

Question 30

Among the more familiar thixotropic agents used in aviation maintenance are

Answer 30

MICROBALLOONS

Question 31

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.

Answer 31

REINFORCING MATERIALS

Question 32

Enhances the strength and durability of thermosetting resin.

Answer 32

GLASS FIBER

Question 33

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

Answer 33

CERAMIC FIBER

Question 34

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

Answer 34

KEVLAR

Question 35

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

Answer 35

GRAPHITE FIBERS

Question 36

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.

Answer 36

LAMINATED STRUCTURAL MATERIALS

Question 37

The cellular core for laminated honeycomb material may be made of

Answer 37

RESIN-IMPREGNATED PAPER / GLASS CLOTH

Question 38

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.

Answer 38

BALSA WOOD

Question 39

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

Answer 39

METAL FACED HONEYCOMB

Question 40

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.

Answer 40

SEALS OR PACKINGS

Question 41

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

Answer 41

O-RING PACKINGS

Question 42

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

Answer 42

BACKUP RINGS

Question 43

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

Answer 43

V-RING PACKINGS / CHEVRON

Question 44

Used in brake assemblies and brake master cylinders.

Answer 44

U-RING PACKINGS

Question 45

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

Answer 45

SHOCK ABSORBER CORD

Question 46

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

Answer 46

GASKETS

Question 47

Commonly used for spark plug gaskets and some hydraulic fittings.

Answer 47

SOLID COPPER WASHER

Question 48

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

Answer 48

CORK GASKETS

Question 49

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.

Answer 49

RUBBER SHEETING

Question 50

Clean and lubricate the exposed portions of piston shafts.

Answer 50

WIPERS

Question 51

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.

Answer 51

SEALING COMPOUNDS

Question 52

Ready for application as packaged.

Answer 52

ONE-PART SEALNT

Question 53

Compounds requiring separate packaging to prevent curing prior to application.

Answer 53

TWO-PART SEALANT

Question 54

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

Answer 54

PRC SEALANT