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A&P Aviation Mechanic General Oral Questions Gary
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A&P Aviation Mechanic General Oral Questions Gary
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A&P Aviation Mechanic GeneralOral Questions Gary
What are two reasons weight and balance control are important in an
aircraft? - -Safety of flight and most efficient operation of an aircraft.
- Where is the center of gravity for most airplanes located in relation to the
center of lift? - -The CG is normally ahead of the center of lift.
- What is meant by the datum that is used for weight and balance
computations? - -It is a readily identified reference chosen by the aircraft
manufacturer from which all longitudinal locations on the aircraft are
referenced.
- What is meant by moment in the computation of weight and balance? - -A
force that tends to cause rotation. It is the product of the weight of an object
in pounds and the distance of the object from the datum in inches.
- What is meant by the arm of an item installed in an aircraft? - -The
distance, in inches, between the center of gravity of the item and the datum.
- Where do you find the arm of an item installed on an aircraft? - -The Type
Certificate Data Sheets for the aircraft.
- What is meant by a moment index? - -A moment divided by a constant
such as 10, 100, or 1,000.
- What is meant by the center of gravity range? - -The distance in inches
between the forward allowable center of gravity and the rearward allowable
center of gravity.
- What is the significance of the empty weight center of gravity range of an
aircraft? - -If the empty weight center of gravity falls within the EWCG range,
the aircraft cannot be legally loaded in such a way that it's loaded center of
gravity will fall outside of the allowable loaded CG range. Not all aircraft have
an EWCG range.
- Why is the empty weight center of gravity range not given in the Type
Certificate Data Sheets for some aircraft? - -The empty weight center of
gravity range is given only for aircraft that cannot be legally loaded in such a
way that the loaded center of gravity will fall outside of the allowable limits.
, - What is meant by the mean aerodynamic chord(MAC)? - -The chord of an
imaginary airfoil that has the same aerodynamic characteristics of an actual
airfoil.
- What is a loading envelope? - -The enclosed area on a graph of an
airplane's loaded weight and CG location. If lines drawn from the weight and
CG cross within this envelope the airplane is properly loaded.
- What is meant by permanent ballast for an aircraft? - -Weight that is
permanently installed in an aircraft to bring the empty weight center of
gravity into allowable limits.
- Where must a record be kept of the current empty weight and the current
center of gravity of an aircraft? - -In the aircraft flight manual or weight and
balance records required by 14 CFR § 23.1583.
- Of what material are most low-pressure rigid fluid lines made? - -1100-1/2
hard or 3003-1/2 hard aluminum alloy tubing.
- Is the size of a rigid fluid line determined by its inside or its outside
diameter? - -Outside diameter.
- When routing a fluid line parallel to an electrical wire bundle, which should
be on top? - -Electrical wire bundle.
- How can you distinguish an AN fluid line fitting from an AC fitting? - -AN
fitting has a shoulder between the end of the flare cone and the first thread.
AC fitting the threads extend all the way to the flare cone.
- How tight should an MS flareless fitting be tightened? - -Tighten the fitting
by hand until it is snug, and then turn it with the wrench for 1/6-turn to 1/3-
turn. Never turn it more the 1/3-turn.
- What damage can be caused by overtightening an MS flareless fitting? - -
Overtightening drives the cutting edge of the sleeve deep into the tube and
weakens it.
- What kind of rigid tubing can be flared with a double flare? - -5052-O and
6061-T aluminum alloy tubing in sizes from 1/8-inch to 3/8-inch OD.
- Of what material should rigid fluid lines be made that carry high-
pressure(3,000 psi or greater) hydraulic fluid? - -Annealed or 1/4-hard
corrosion-resistant steel.
, - What is the difference between the flare angle for aircraft and automotive
fittings? - -Aircraft fittings have 37º flare angle and automotive fittings use
45º.
- What should be done to the end of a tube that is to be flared? - -The cut
end should be polished to remove any sharp edges that could cause the
tubing to crack.
- What is the function of the lay line(the identification stripe) that runs the
length of a flexible hose? - -To show if the line was twisted during
installation.
- Where are quick-disconnect fluid line couplings normally used in an aircraft
hydraulic system? - -In the lines that connect the engine-driven pump into
the hydraulic system.
- Is the size of a flexible hose determined by its inside or its outside
diameter? - -Inside Diameter.
- What is the minimum amount of slack that must be left when a flexible
horse is installed in an aircraft hydraulic system? - -The hose should be at
least 5% longer than the distance between fittings.
- 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.
- How much pressure is used to proof-test a flexible hose assembly? - -
Varies but generally about two times operating pressure.
- 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.
- What inspection method would be most appropriate for checking a
nonferrous metal part for intergranular corrosion? - -Eddy Current
inspection.
- What inspection method would be most appropriate for checking the
internal structure of an airplane wing for corrosion? - -X-Ray Inspection.
- How does filiform corrosion usually appear on an aircraft structure? - -As
thread-like lines of puffiness under a film of polyurethane or other dense
finish system topcoats.
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