O.D (Aircraft Materials, Hardware, and Processes) Flashcards
What is the proper type of nondestructive inspection to use for locating surface cracks in an aluminum alloy casting or forging?
Zyglo or dye penetrant
Explain the procedure to use when making a dye penetrant inspection of a part
Clean the part thoroughly and apply the penetrant and allow it to soak for the recommended time. Remove all of the penetrant from the surface and apply the developer.
Explain the procedure to use when making a magnetic particle inspection of a part.
Thoroughly clean the part, magnetize it as directed by the appropriate service manual, flow the indicating medium over the surface and inspect it under a “black” light. When the inspection is complete, thoroughly demagnetize the part.
What inspection method would be most appropriate for checking a nonferrous metal part for intergranular corrosion?
Eddy current isnpection
What insection method would be most appropriate for checking the internal structure of an airplane wing for corrosion?
X-ray inspection
Why is it important that all engine parts which have been inspected by the magnetic particle method be completely demagnetized?
If the parts are not completely demagnetized, the will attract steel particles that are produced by engine wear and will cause damage to bearing surfaces
Why is it important that all parts be thoroughly cleaned before they are inspected by the dye penetrant method?
Any grease or dirt in a fault will keep the penetrant from seeping into the fault
Why is it important that a piece of aluminum alloy be quenched immediately after it is removed from the heat-treating oven?
Any delay in quenching aluminum alloy after it is removed from the oven will allow the grain structure to grow enough that intergranular corrosion is likely to form in the metal.
Explain the way a steel structure is normalized after it has been welded
Heat the steel structure to a temperature above its critical temperature and allow it to cool in still air
Why is a piece of steel tempered after it has been hardened?
When steel is hardened, it becomes brittle and tempering removes some of its brittleness
What is meant by an icebox rivet?
A rivet made of 2017 or 2024 aluminum alloy. These rivets are heat-treated and quenched, then stored in a subfreezing ice box until they are ready to be used. The cold storage delays the hardening of the rivet
What type of loading should be avoided when using a self-locking nut on an aircraft bolt?
A self-locking nut should not be used for any application where there are any rotational forces applied to the nut or to the bolt
What determines the correct grip length of a bolt used in an aircraft structure?
The grip length of the bolt should be the same as the combined thickness of the materials being held by the bolt.
How tight should a nut be installed on a clevis bolt that is used to attach a cable fitting to a control surface horn?
The nut on a clevis bolt should not be tight enough to prevent the clevis bolt turning in the cable fitting and the horn
Why is it very important that the surface of a price of clad aluminum alloy not be scratched?
The pure aluminum used for the cladding is noncorrosive, but the aluminum allow below the cladding is susceptible to corrosion. If the cladding is scratched through, corrosion could form.