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KINK - a form of warp in which the lumber deviates edgewise from a straight line from end to end.

CROOK - a form of warp that is also known as spring.

BOW - A form of warp in which there is movement along one edge of the lumber.

QUARTER SAWN - it is more stable and has an amazing straight-grain pattern.

PHENOL-FORMALDEHYDE GLUE - a type of adhesive that is known for its impracticality for use on repairs.

EPOXY RESIN - a type of adhesive that is known as the adhesive that requires less attention and clamping pressure to provide satisfactory gluing.

THREE PLY LUMBER CORE PLYWOOD - a type of wood outlined in MIL-P-6070 that is stronger than its counterpart.

LAMINATED WOOD - a type of wood outlined in MIL-P-6070 that is more resistant to warping than solid wood.

NORTHERN WHITE PINE - wood that cannot be used as a substitute without increasing its size. Its texture is less uniform than spruce.

YELLOW POPLAR - wood that should not be used as a direct substitute without carefully accounting for slightly reduced strength properties.

WHITE CEDAR - wood that gluing satisfactory can be achieved if suitable precautions are taken.

WESTERN HEMLOCK - directly substituted to spruce but its texture is less uniform than spruce.

MOSQUITO BOMBER – the first heavier-than-air that had the first dedicated propeller engine but wood in the structure.

6 RINGS PER 1 INCH – allowable number of annular rings for all the reference and substitute wood for aircraft construction.

BASSWOOD – bonded together in a hot press over hardwood cores.

BANANA OIL AND COLLODION – the first dope that is applied to the aircraft.

CELLULOSE ACETATE – developed after the other dope is proven flammable and made the fabric translucent.

COLORED ENAMEL – the first material applied to the doped fabric to block sunlight.

AIRCRAFT DOPE – process of applying a material that renders the aircraft airtight and waterproof.

RETARDER – an additive that prevents rapid evaporation and the accompanying temperature top.

REJUNEVATOR – a mixture of very potent solvents that penetrates the doped fabric.

NITRATE DOPE – used the same way as glue when bonding fabric into the rib structure.

WARP – used for counting the threads vertically.

PINKED EDGE – cut to the fabric that prevents it from raveling.

CROSS COAT – process of applying the second spray, perpendicular to the first one.

ANTI-CHAFE TAPE – a finishing material that covers any protrusions in order to prevent the fabric from being penetrated and torn.

RIB LACING CORD – finishing material that prevents the fabric from pulling away from the ribs during flight due to the production of lift.

RIB BRACING TAPE – finishing materials that are applied spanwise and progress from rib to rib.

SURFACE TAPE – blends the covering around contours and irregularities to make a smoother surface finish.

FALSE - Lighter-than-air aircraft started using hydrogen because of the helium explosion of an airship.

TRUE – all trees have only two inner cores: sapwood and heartwood.

TRUE – annular rings represent the passage of the growth speed of a tree throughout the seasons in a year.

FALSE – heartwood is called heartwood because it contains the living cells that participate in the life process of the tree.

TRUE – application of banana oil and collodion provided better dimensional stability on aircraft.

TRUE – aconite, which is a polyester fabric, is one of the approved substitute materials for aircraft fabrics.

FALSE – selvege edge is the edge of the cloth, tape, or webbing woven to prevent raveling.

TRUE – inspection rings prevent the aircraft fabric part from being all replaced when checked/cut for inspection.

FALSE – when the fabric gets torn when using the Maule Tester, regardless of the reading, it fails the test and does not pass the TSO standard.

TRUE – surface tape prevents the covering material from coming loose in the airstream during flight.