Aircraft Drawings
What type of line is normally used in a drawing or blueprint that indicates invisible edges or contours?
Medium-weight short dashes evenly spaced.
In physics, which of the following factors are necessary to determine power?
Force exerted, distance moved, and time required.
How is a quality system assured?
By an internal reporting and auditing system.
Which law of electricity is the most important for an aircraft mechanic to know?
Ohm’s law
Is the size of a flexible hose determined by its inside or its outside diameter?
By its inside diameter
Why is a piece of steel tempered after it has been hardened?
When steel is hardened, it becomes brittle and tempering removes some of this brittleness
What type of drawing line consists of alternating long and short lines?
Center.
Centerlines are made up of alternate long and short dashes. They indicate the center of an object or part of an object. Where centerlines cross, the short dashes intersect symmetrically. In the case of very small circles, the centerlines may be shown unbroken.
The boiling point of a given liquid varies
directly with pressure.
When we think of aviation safety in a contemporary way, human error is
the starting point.
The “SHEL” model is another concept for investigat?ing and evaluating maintenance errors. The acronym SHEL represents software, hardware, environment, and liveware—with the human as the starting point for all.
What is the basic unit of capacitance?
The farad.
What is the principal advantage of Teflon hose for use in an aircraft hydraulic system?
Teflon hose retains its high strength under conditions of high temperature.
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.
Sketches are usually made easier by the use of
graph paper.
Sketches are easily made by using graph paper, which is available, ruled with light lines, in either four or five squares to the inch.
Which of the following is NOT considered a method of heat transfer?
Diffusion.
The three types of human error are
omission, commission, and extraneous
What happens to the current in a DC circuit if the voltage is increased but the resistance remains the same?
The current increases
Where are quick-disconnect fluid line couplings normally used in an aircraft hydraulic system?
Quick disconnect couplings are normally used where the engine-driven pump connects into the hydraulic system.
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 thicknesses of the materials being held by the bolt.
In the reading of aircraft blueprints, the term “tolerance,” used in association with aircraft parts or components,
is the difference between extreme permissible dimensions that a part may have and still be acceptable.
The speed of sound in the atmosphere is most affected by variations in which of the following?
Ambient temperature
The positive aspects of human factor issues are referred to as the
Magnificent Seven
What instrument is used to measure the specific grav?ity of the electrolyte in a lead-acid batte
A hydrometer
When routing a fluid line parallel to an electrical wire bundle, which should be on top?
The electrical wire bundle should be on top
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.
A specific measured distance from the datum or some other point identified by the manufacturer, to a point in or on the aircraft is called a
station number
A station number is a number used to identify the number of inches from the datum or other point identified by the manufacturer to a point in or on the aircraft.
The purpose of aircraft wing dihedral is to
increase lateral stability
Dihedral or the upward slant of the wing from the fuselage is used to increase the lateral stability. Lateral stability is roll stability and is stability about the longitudinal axis.
According to Dr. James Reason, there are two types of human failure which can occur. They are:
active and latent
What is meant by electromagnetic induction?
The transfer of electrical energy from one conductor to another that is not electrically connected
How tight should an MS flareless fitting be tightened?
Tighten the fitting by hand until it is snug, and then turn it with a wrench for 1/6-turn to 1/3-turn. Never turn it more than 1/3-turn with a wrench.
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
How many views can there be in an orthographic projection?
Six
The purpose of stall strips on airplane wings is to
ensure that the wing root areas stall first.
Many areas of aviation have shifted their focus from eliminating error to
preventing and managing error
What is the range of temperatures of the electrolyte in a lead-acid battery that does not require that you apply a correction when measuring its specific gravity?
Between 70 degrees and 90 degrees Fahrenheit
What is the minimum amount of slack that must be left when a flexible hose is installed in an aircraft hydraulic system?
The hose should be at least 5% longer than the distance between the fittings. This extra length provides the needed slack.
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, they will attract steel particles that are produced by engine wear and will cause damage to bearing surfaces.