Aircraft Hardware
What is indicated by the markings on the heads of solid shank rivets?
The material they are made of, and indirectly, their strength.
What are two types of fluid lines commonly found in aircraft?
Rigid metal lines and flexible hoses.
One kilowatt is equal to how many watts?
1,000 watts
How do you work harden a piece of metal?
by cold working the metal
what Federal aviation regulation prescribe the requirements for issuance of a type certificate
FAR (14 CFR) Part 21
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 softer for several days.
How can you determine if a fitting is an AN type rather than a AC type?
AN fittings have a shoulder between the flare cone and the end of the threads, AC fittings do not.
what law describes the most fundamental or basic relationship in an electrical circuit?
Ohms law
Describe the primary difference between a thermosetting and a thermoplastic resin
THERMOSETTING doesn't soften when heated and chars or burns rather than melting
THERMOPLASTIC becomes soft and pliable when heated, and hardens when cooled
Who is responsible for ensuring that only the most current information is used when performing maintenance on an aircraft?
the person performing the maintenance
What is the grip length of a bolt?
The length of the unthreaded portion.
what are some of the important advantages of Teflon tubing?
If the resistance in a DC circuit remains the same but the voltage doubles, what happens to the amount of current flowing in the circuit?
it also doubles
Explain how thermoplastic are commonly used in modern aircraft
Plexiglass is a thermoplastic resin commonly used for windshields or windows
if a mechanic wishes to develop a checklist for an annual or 100-hour inspection, what publication contains the guidelines for the required inspection items?
FAR Part 43, Appendix D, contains the scope and detail of an inspection checklist
In what way are AN standard steel bolts indetified?
By the code markings on the bolt head.
Describe the identification markings commonly found on flexible hoses
what three elements are required to form an electrical circuit?
(1) a source of electrical energy (2) a load or resistance to use the electricity (3) Wires or conductors to connect the source to the load
name one of the types of resin commonly used as a matrix material for aircraft composite laminates
polyester resin or epoxy resin
What publication might you consult for guidance when maintaining an old aircraft for which no maintenance manual exists?
AC 43.13-1B or its latest revision
What is the difference between a close tolerance bolt and a general purpose bolt?
Close tolerance bolts are machine to more accurate dimensions.
How are flexible hose sizes designated?
How are metal hose sizes designated?
Flexible: Inside diameter in 1/16in
Metal: Wall thickness and outside diameter in 1/16in
a fully charged lead-acid battery has a specific gravity that varies between what two values?
1.275 and 1.300
what are some of the materials that are commonly used as the reinforcing component in a composite structure?
Fiberglass, Aramid (Kevlar), Graphite (Carbon) fiber, Linen, and Paper
What is the name of the manual that the manufacturer provides to technicians who normally perform work on the systems and components of an aircraft?
Aircraft Maintenance Manual (AMM)
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 you fabricate a replacement for flexible hose, what percentage of total length must be added to allow for movement under pressure?
5 to 8 percent
What is the Principe advantage of AC current over DC current?
Power can be transmitted over long distances more efficiently and with smaller wires because the voltage can be easily increased or decreased by a transformer
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
when the service bulletin is incorporated in an AD
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 the AC 43.13-1B.
Why are quick disconnect fittings used?
What property of an AC circuit is defined by the term "impedance"?
the total opposition to current flow
give one advantage of pre-preg (pre-impregnated) materials, other than saving time in the construction or repair of composite components
(1) pre-preg fabrics contain the correct amount of matrix
(2) the matrix material evenly and completely permeated the reinforcing fibers
(3) the matrix has the resin and hardener in the correct proportions
How often is the summary of ADs published?
Every 2 years
What is the most commonly used type of aircraft control cable?
extra flexible 7x19 stainless steel cable
In addition to being securely clamped, what is an additional requirement for installing metal fuel, oil, and hydraulic lines?
the lines must be electronically bonded to the structure.
A 24 volt lead acid battery has how many cells?
twelve (12)
Explain how thermosetting resins are commonly used in modern aircraft
Thermosetting resins are most often used as the matrix material in composite structures
what regulation authorizes a certificated mechanic who holds an Inspection Authorization (IA) to approve or deny a major repair or alteration?
FAR 65.95