Jeppesen A&P General Oral Exam
Graded A+
A correctly made butt weld will have what bead width and how much penetration? -
ANSWER-Bead width should be 3 to 5 times the thickness of the base metal, and there
must be 100 % penetration
A fully charged lead acid battery has a specific gravity range between what two values?
- ANSWER-1.275 and 1.300
A wheelbarrow is what class of lever? - ANSWER-second class (first class: see-saw,
third class: tweezers)
Are all three states of matter affected by thermal expansion? If so, which is affected
most? - ANSWER-All three are affected, gases are affected the most
Are there any circumstances when more than two copies of Form 337s are required,
and if so, when? - ANSWER-Yes, three copies are required when a fuel tank is installed
in the passenger or baggage compartment, the third copy must be kept aboard the
aircraft.
Area of a triangle? - ANSWER-1/2 X B (base) X H (height)
As a certificated mechanic, will you automatically receive all ADs? - ANSWER-No, ADs
are automatically sent only to registered aircraft owners
Can liquids be compressed? - ANSWER-No, liquids are generally considered
incompressible
DC circuits can take one of three forms or types, what are they? - ANSWER-Series,
Parallel, or Series-Parallel
Define "Residual Oil" - ANSWER-Any oil left in tanks, lines, and engines after system
has been drained
Define "tare weight" and describe how it is handled when weighing an aircraft -
ANSWER-Tare weight is the weight of anything on the scales that is not part of the
aircraft. It must be subtracted from the scale weight reading to determine the net weight
of the airplane
Define Inductance - ANSWER-An induced voltage which is opposite the direction of the
applied voltage
Define kinetic energy - ANSWER-the energy of motion
,Define matter - ANSWER-Any substance that occupies space and has mass
Define Mean Aerodynamic Chord - ANSWER-MAC is the chord drawn through the
center of the wing plan area
Define Pi - ANSWER-A constant that expresses the relationship between circumference
and diameter of a circle, approximately 3.14159 (number of times the diameter goes
into the circumference)
define the term "residual fuel" - ANSWER-Any fuel that remains in the tanks, lines, and
engines after the system has been drained
Describe a trapezoid - ANSWER-A trapezoid is a closed, four-sided figure having two
parallel sides and two sides that are not parallel.
Describe an orthographic projection - ANSWER-A way of drawing an object using
different views at right angles to each other, such as top, front, and side view
Describe how pressure is transmitted when a force is applied to a confined liquid -
ANSWER-Pressure is transmitted equally in all directions
Describe the appearance of lines used to show hidden views, alternate positions, and
the middle of symmetrical objects, and give their proper names - ANSWER-Hidden
views are shown with hidden lines: short, evenly spaced dashes. Alternate positions are
shown with phantom lines: light, alternating long dashes and two short dashes. Center
lines are alternating long and short dashes
Describe the basic steps for conducting a magnetic particle inspections - ANSWER-
Magnetize the part, then coat the surface with ferromagnetic particles. If a defect or
discontinuity is present, the particles align with the discontinuity forming a visible pattern
Describe the effects of using steel brushes or steel wool to remove corrosion from
aluminum surfaces - ANSWER-Steel brushes or steel wool must not be used to clean
aluminum because steel particles can become embbedded in the aluminum and cause
corrosion
Describe the identification markings commonly found on flexible hoses - ANSWER-A lay
line, identification such as a Mil Spec number, the manufacturer's name or symbol, the
hose size and a date code
Describe the important precautions that should be observed when fueling an aircraft -
ANSWER-Use correct fuel, properly ground the aircraft and refueling unit, protect the
aircraft surfaces from hose and nozzle damage
, Describe the method of classifying metal tube according to size - ANSWER-Metal
tubing is sized according to wall thickness and outside diameter. Outside diameter is
measured in 1/16 inch increments
Describe the operation of quick disconnect couplings - ANSWER-Each half has a valve
that is held open when coupled and is spring-loaded closed when disconnected
Describe the precautions that should be taken to protect life and property while starting
and running an aircraft engine - ANSWER-Study the procedures in the Airplane Flight
Manual. Be sure the propeller or inlet area is clear and check for loose stones, gravel,
etc. that could be sucked into the prop or engine. Also ensure that the prop or jet blast
doesn't blow into hangars or other airplanes, and have a fire guard nearby
Describe the primary difference between a thermosetting and thermoplastic resin -
ANSWER-A thermosetting resin doesn't soften when heated and chars or burns rather
than melting. Thermoplastic resins become soft and pliable when heated, and harden
when cooled
Describe the result of adding a large positive number and a smaller negative number -
ANSWER-result is smaller positive number, same as ignoring the signs and subtracting
smaller number
Describe the steps involved in a dye penetrant inspection - ANSWER-Surface is
cleaned, penetrant is applied and allowed to dwell for a specified time, The penetrant is
then removed with an emulsifier or cleaner, the part is dried then developer is applied.
The results are then inspected.
Describe the tools that should be used to remove corrosion from aluminum surfaces -
ANSWER-Nylon scrubber pads (scotch brite), bristle brushes, aluminum wool or
aluminum wire brushes
Describe the two most common ways of showing the CG location and/or CG range -
ANSWER-In inches from the datum or as a percent of MAC
Describe the two types of flares commonly used on aircraft tubing - ANSWER-Single
and double flare
Discuss the general precautions that should be observed when washing an airplane. -
ANSWER-Avoid or protect areas which may be damaged or contaminated such as Pitot
and static ports, hinges, sealed areas, and bearings
Explain how thermoplastic and thermosetting resins are commonly used in modern
aircraft - ANSWER-Plexiglas is a thermoplastic resin used for windshields and windows.
Thermosetting resins are most often used as the matrix material in composite structures
Graded A+
A correctly made butt weld will have what bead width and how much penetration? -
ANSWER-Bead width should be 3 to 5 times the thickness of the base metal, and there
must be 100 % penetration
A fully charged lead acid battery has a specific gravity range between what two values?
- ANSWER-1.275 and 1.300
A wheelbarrow is what class of lever? - ANSWER-second class (first class: see-saw,
third class: tweezers)
Are all three states of matter affected by thermal expansion? If so, which is affected
most? - ANSWER-All three are affected, gases are affected the most
Are there any circumstances when more than two copies of Form 337s are required,
and if so, when? - ANSWER-Yes, three copies are required when a fuel tank is installed
in the passenger or baggage compartment, the third copy must be kept aboard the
aircraft.
Area of a triangle? - ANSWER-1/2 X B (base) X H (height)
As a certificated mechanic, will you automatically receive all ADs? - ANSWER-No, ADs
are automatically sent only to registered aircraft owners
Can liquids be compressed? - ANSWER-No, liquids are generally considered
incompressible
DC circuits can take one of three forms or types, what are they? - ANSWER-Series,
Parallel, or Series-Parallel
Define "Residual Oil" - ANSWER-Any oil left in tanks, lines, and engines after system
has been drained
Define "tare weight" and describe how it is handled when weighing an aircraft -
ANSWER-Tare weight is the weight of anything on the scales that is not part of the
aircraft. It must be subtracted from the scale weight reading to determine the net weight
of the airplane
Define Inductance - ANSWER-An induced voltage which is opposite the direction of the
applied voltage
Define kinetic energy - ANSWER-the energy of motion
,Define matter - ANSWER-Any substance that occupies space and has mass
Define Mean Aerodynamic Chord - ANSWER-MAC is the chord drawn through the
center of the wing plan area
Define Pi - ANSWER-A constant that expresses the relationship between circumference
and diameter of a circle, approximately 3.14159 (number of times the diameter goes
into the circumference)
define the term "residual fuel" - ANSWER-Any fuel that remains in the tanks, lines, and
engines after the system has been drained
Describe a trapezoid - ANSWER-A trapezoid is a closed, four-sided figure having two
parallel sides and two sides that are not parallel.
Describe an orthographic projection - ANSWER-A way of drawing an object using
different views at right angles to each other, such as top, front, and side view
Describe how pressure is transmitted when a force is applied to a confined liquid -
ANSWER-Pressure is transmitted equally in all directions
Describe the appearance of lines used to show hidden views, alternate positions, and
the middle of symmetrical objects, and give their proper names - ANSWER-Hidden
views are shown with hidden lines: short, evenly spaced dashes. Alternate positions are
shown with phantom lines: light, alternating long dashes and two short dashes. Center
lines are alternating long and short dashes
Describe the basic steps for conducting a magnetic particle inspections - ANSWER-
Magnetize the part, then coat the surface with ferromagnetic particles. If a defect or
discontinuity is present, the particles align with the discontinuity forming a visible pattern
Describe the effects of using steel brushes or steel wool to remove corrosion from
aluminum surfaces - ANSWER-Steel brushes or steel wool must not be used to clean
aluminum because steel particles can become embbedded in the aluminum and cause
corrosion
Describe the identification markings commonly found on flexible hoses - ANSWER-A lay
line, identification such as a Mil Spec number, the manufacturer's name or symbol, the
hose size and a date code
Describe the important precautions that should be observed when fueling an aircraft -
ANSWER-Use correct fuel, properly ground the aircraft and refueling unit, protect the
aircraft surfaces from hose and nozzle damage
, Describe the method of classifying metal tube according to size - ANSWER-Metal
tubing is sized according to wall thickness and outside diameter. Outside diameter is
measured in 1/16 inch increments
Describe the operation of quick disconnect couplings - ANSWER-Each half has a valve
that is held open when coupled and is spring-loaded closed when disconnected
Describe the precautions that should be taken to protect life and property while starting
and running an aircraft engine - ANSWER-Study the procedures in the Airplane Flight
Manual. Be sure the propeller or inlet area is clear and check for loose stones, gravel,
etc. that could be sucked into the prop or engine. Also ensure that the prop or jet blast
doesn't blow into hangars or other airplanes, and have a fire guard nearby
Describe the primary difference between a thermosetting and thermoplastic resin -
ANSWER-A thermosetting resin doesn't soften when heated and chars or burns rather
than melting. Thermoplastic resins become soft and pliable when heated, and harden
when cooled
Describe the result of adding a large positive number and a smaller negative number -
ANSWER-result is smaller positive number, same as ignoring the signs and subtracting
smaller number
Describe the steps involved in a dye penetrant inspection - ANSWER-Surface is
cleaned, penetrant is applied and allowed to dwell for a specified time, The penetrant is
then removed with an emulsifier or cleaner, the part is dried then developer is applied.
The results are then inspected.
Describe the tools that should be used to remove corrosion from aluminum surfaces -
ANSWER-Nylon scrubber pads (scotch brite), bristle brushes, aluminum wool or
aluminum wire brushes
Describe the two most common ways of showing the CG location and/or CG range -
ANSWER-In inches from the datum or as a percent of MAC
Describe the two types of flares commonly used on aircraft tubing - ANSWER-Single
and double flare
Discuss the general precautions that should be observed when washing an airplane. -
ANSWER-Avoid or protect areas which may be damaged or contaminated such as Pitot
and static ports, hinges, sealed areas, and bearings
Explain how thermoplastic and thermosetting resins are commonly used in modern
aircraft - ANSWER-Plexiglas is a thermoplastic resin used for windshields and windows.
Thermosetting resins are most often used as the matrix material in composite structures
