Materials and Processes

Front

Why is it important that all engine parts which have been inspected by magnetic particle method be completely demagnetized?

Back

If the parts are not completely demagnetized, they will attract steel particles that are produced by engine wear and will cause damage to bearing surfaces.

Front

What inspection method would be the most appropriate for checking a nonferrous metal part for intergranular corrosion?

Back

Eddy current inspection.

Front

Why is a piece of steel tempered after it has been hardened?

Back

When steel is hardened, it becomes brittle and tempering removes some of this brittleness.

Front

What kind of measuring instrument is used to measure the runout of an aircraft engine crankshaft?

Back

A dial indicator.

Front

What must be done to a welded joint if it must be rewelded?

Back

All traces of the old weld must be removed so the new weld will penetrate the base metal.

Front

What is meant by precipitation heat treatment of a piece of aluminum alloy?

Back

After a piece of aluminum has been solution heat-treated, it is held at a specified elevated temperature for a period of time. Precipitation heat-treating is also called artificial aging.

Front

Explain the way a piece of aluminum alloy is solution heat-treated.

Back

The aluminum is heated in an oven to the proper temperature for a specified time; then it is removed and quenched in water.

Front

What determines the correct grip length of a bolt used in an aircraft structure?

Back

The grip length of the bolt should be the same as the combined thicknesses of the materials being held by the bolt.

Front

What inspection method would be most appropriate for checking the internal structure of an airplane wing for corrosion?

Back

X-ray inspection.

Front

What is the proper type of nondestructive inspection to use for locating surface cracks in an aluminum alloy casting or forging?

Back

Zyglo or dye penetrant.