AIR 1120 Aircraft Bolts

What is a requirement of hardware we use on aircraft?

• Traceability

• Must be made of strong steel

• Cannot be altered

• Locking holes

What is not, a consideration of fastener material?

• Operating Temperature

• Environment

• Loading

• Airframe color

Most aircraft fasteners are:

• In shear

• In tension

• In high-temperature environments

• Made of none corrosive material

The most common hardware standards in aviation are:

• AN, MS, NAS

• AN, BS, SAE

• AN, MS, ASTM

• AN, SAE, ASTM

AN hardware:

• Is the original hardware standard

• Has higher tensile strength than other hardware standards

• Has been completely superseded and not used as a standard anymore

• Have all part numbers identified on their bolt heads

Aviation bolts:

• Are made with low carbon steel

• Have low tensile strength

• Have minimal corrosion protection

• Are mostly alloyed with nickel

Most aviation nuts and bolts have a:

• Class 2 fit

• Class 3 fit

• Class 4 fit

• Class 5 fit

A bolt is a proper length when:

• 3 threads are after the washer

• No more than 1 thread is inside the bolt hole

• No more than half the hole is filled with bolt threads

• At least 1 thread is above the bolt hole surface

A properly installed bolt can be usually identified by:

• At least 1 thread protruding above the nut

• No more than 4 threads protruding above the nut

• A cotter pin

• By the lockwire installation

It is acceptable to cut a bolt that this too long

• True

• False