FAA O&P - E.K

Structural Materials & HARDWARE

How do you work harden a piece of metal

by cold working the metal

Describe the primary difference between a thermosetting and a thermoplastic resin

a thermosetting resin doesn’t soften when heated and chars or burns rather than melting. Thermoplastic resins become soft and pliable when heated, and harden when cooled

Explain how thermoplastic and thermosetting resins are commonly used in modern aircraft

plexiglass is a thermoplastic resin commonly used for windshields and windows. Thermosetting resins are most often used as the metric material in composite structures

name one of the types of resin commonly used as a metric material for aircraft composite laminates

polyester resin or epoxy resin

what are Simone off the materials that are commonly used as the reinforcing component in. a composite structure

fiberglass, kevlar, carbon fiber linen, and paper

What are the reasons that alloy steel that is responsive to heat treatment is usually less suitable for welding

it may become brittle and lose its ductility in the area of the weld

Give an advantage of pre-pregnancy material, other than saving time

you don’t have to manually measure out the proportions

What is indicated by the markings on the heads of solid shank rivets

The material that they are made of, and indirectly, their strength

How can you keep heat treated aluminum alloy rivets soft enough to install after the quenching process

if the rivets are stored in a freezer they will remain soft for several days

What is the grip length of a bolt

the length of the unthreaded portion

In what way are AN standard steel bolts identified

by the code markings on the bolt heads

What is the difference between a close tolerance bolt and a general purpose bolt

Close tolerance bolts are machines to more accurate dimensions

For what types of applications are self locking nuts not allowed

Self locking nuts may not be used when either the bolt or the nut is subject to rotation

if the maintenance procedures do not specify a torque value for a bolt or nut, how can you determine the proper values

consult a standard torque table such as found in AC 43 13 1B

What is the most commonly used type of aircraft control cable

Extra flexible 7 × 19 stainless steel cable