AMT Airframe O&P-Questions with Correct Answers/Verified
what is the purpose of reinforcing tape? - ✔✔reinforcing tape is used over ribs between the
fabric covering and the rib stitching to prevent the stitching cord from cutting through the
fabric.
what type of fabric is not affected by moisture and mildew? - ✔✔fiberglass fabric is not
affected by moisture, mildew, chemicals and most acids.
what methods are used to check the strength of doped fabric? - ✔✔fabric punch testers will
provide a general indication of the strength of the fabric, but if a punch tester indicates that
the fabric strength is marginal, a laboratory test should be performed to determine the
actual strength of the fabric.
what type of machine-sewed seams are used in aircraft covering? - ✔✔plain overlap seams,
folded fell seams, and French fells seams
if the original rib stitch spacing cannot be determined when re-covering an aircraft. What rib
stitching should be used? - ✔✔use the rib stitching spacing chart in advisory circular 43.13-
1B
what is the standard tie off knot used during rib stitching - ✔✔a modified seine knot to tie
off all stitches except the starting stitch
what do you call the edge of cloth, tape or webbing that has been woven to prevent
traveling? - ✔✔selvage edge
the types of fabric used for covering aircraft are organic and synthetic. Name two organic
and synthetic fibers - ✔✔the organic fibers are cotton and linen. the synthetic fibers include
fiberglass and heat shrinkable synthetic fibers such as nylon, orlon and Dacron
when covering aircraft, where is surface tape used? - ✔✔sewed seams, lapped edges, and
rib stitching or screws must be covered with pinked -edge surface tape
,Name the advantages of using the envelope method to cover fabric aircraft? - ✔✔it saves
labor because machines, on at least three sides, do the sewing
what type of test can be performed to identify existing paint finishes - ✔✔apply a coat of
engine oil to a small area. Nitrocellulose will soften with a few minutes, but acrylic and
epoxy will show no effects. If not determined, next wipe down a small area with MEK. MEK
will pick up pigment from an acrylic finish, but will not affect an epoxy coating.
what causes blushing , when applying dope or lacquer, and how can it be prevented? -
✔✔when doping is accompanied by humid conditions blushing is common. Rapid
evaporation of thinners and solvents, lower the temperature of the surface of the wet dope
causing condensation of moisture from the air. The moisture causes a milky white
appearance known as blush. The condition may be eliminated by heating the room to
decrease humidity, or by using a blush retarding thinner to increase the drying time,
Blushing is also caused by moisture in the air supply, drafts or changes in temperature.
what is the cause of using fungicidal dope when doping aircraft fabric? - ✔✔to prevent
micro-biological deterioration (rotting) of the fabric
what are the 3 types of dope used for aircraft finishes? - ✔✔they are clear dope, semi-
pigmented dope, and pigmented dope
what would happen if dope were used over paint enamel? - ✔✔It would have the tendency
to lift and remove such materials
what is applied to metallic surfaces as a corrosion resistant covering before the application
of enamel or lacquer? - ✔✔zinc chromate primer is normally used for this purpose
what are the most common methods of applying aircraft finishes - ✔✔they are dipping,
brushing or spraying
what is normally the cause of runs and sags in a spray paint finish? - ✔✔holding the gun too
long in one place causing too much paint to be applied
, what causes an orange peel or pebble finish? - ✔✔the spray gun setting, incorrect air
pressure, incorrect paint viscosity, and holding the gun too far from the work.
what is used to thin zinc chromate primer? - ✔✔toluene
which federal regulation prescribes the size and location requirements for aircraft
identification number? - ✔✔FAR Part 45
what type of materials should be thoroughly protected when using paint remover? -
✔✔synthetic rubber surfaces, aircraft tires, fabric and acrylics must be protected against
possible contact with paint remover
what is the grip length of a rivet? - ✔✔the grip length is the combined thickness of the
materials to be joined by the rivet
where are special rivets, such as huck or cherry lock rivets used? - ✔✔they are used in
places where access to both sides of the riveted structure is impossible, or where limited
space will not permit the use of a bucking bar. These rivets require special tools, installation,
and removal procedures. They are commonly called blind rivets.
what type of materials are used in honeycomb construction? - ✔✔honeycomb construction
may employ stainless steel, titanium, magnesium, plywood, resin impregnated paper, glass,
nylon, or cotton cloth in various combinations.
what factors are used to determine setback? - ✔✔the radius of the bend and the thickness
of the material. Setback=radius plus thickness
what is a joggle? - ✔✔is an offset formed on an angle strip to allow clearance for a sheet or
extrusion
what are several methods used in forming sheet metal? - ✔✔folding, bumping, crimping,
shrinking and stretching
what is the purpose of reinforcing tape? - ✔✔reinforcing tape is used over ribs between the
fabric covering and the rib stitching to prevent the stitching cord from cutting through the
fabric.
what type of fabric is not affected by moisture and mildew? - ✔✔fiberglass fabric is not
affected by moisture, mildew, chemicals and most acids.
what methods are used to check the strength of doped fabric? - ✔✔fabric punch testers will
provide a general indication of the strength of the fabric, but if a punch tester indicates that
the fabric strength is marginal, a laboratory test should be performed to determine the
actual strength of the fabric.
what type of machine-sewed seams are used in aircraft covering? - ✔✔plain overlap seams,
folded fell seams, and French fells seams
if the original rib stitch spacing cannot be determined when re-covering an aircraft. What rib
stitching should be used? - ✔✔use the rib stitching spacing chart in advisory circular 43.13-
1B
what is the standard tie off knot used during rib stitching - ✔✔a modified seine knot to tie
off all stitches except the starting stitch
what do you call the edge of cloth, tape or webbing that has been woven to prevent
traveling? - ✔✔selvage edge
the types of fabric used for covering aircraft are organic and synthetic. Name two organic
and synthetic fibers - ✔✔the organic fibers are cotton and linen. the synthetic fibers include
fiberglass and heat shrinkable synthetic fibers such as nylon, orlon and Dacron
when covering aircraft, where is surface tape used? - ✔✔sewed seams, lapped edges, and
rib stitching or screws must be covered with pinked -edge surface tape
,Name the advantages of using the envelope method to cover fabric aircraft? - ✔✔it saves
labor because machines, on at least three sides, do the sewing
what type of test can be performed to identify existing paint finishes - ✔✔apply a coat of
engine oil to a small area. Nitrocellulose will soften with a few minutes, but acrylic and
epoxy will show no effects. If not determined, next wipe down a small area with MEK. MEK
will pick up pigment from an acrylic finish, but will not affect an epoxy coating.
what causes blushing , when applying dope or lacquer, and how can it be prevented? -
✔✔when doping is accompanied by humid conditions blushing is common. Rapid
evaporation of thinners and solvents, lower the temperature of the surface of the wet dope
causing condensation of moisture from the air. The moisture causes a milky white
appearance known as blush. The condition may be eliminated by heating the room to
decrease humidity, or by using a blush retarding thinner to increase the drying time,
Blushing is also caused by moisture in the air supply, drafts or changes in temperature.
what is the cause of using fungicidal dope when doping aircraft fabric? - ✔✔to prevent
micro-biological deterioration (rotting) of the fabric
what are the 3 types of dope used for aircraft finishes? - ✔✔they are clear dope, semi-
pigmented dope, and pigmented dope
what would happen if dope were used over paint enamel? - ✔✔It would have the tendency
to lift and remove such materials
what is applied to metallic surfaces as a corrosion resistant covering before the application
of enamel or lacquer? - ✔✔zinc chromate primer is normally used for this purpose
what are the most common methods of applying aircraft finishes - ✔✔they are dipping,
brushing or spraying
what is normally the cause of runs and sags in a spray paint finish? - ✔✔holding the gun too
long in one place causing too much paint to be applied
, what causes an orange peel or pebble finish? - ✔✔the spray gun setting, incorrect air
pressure, incorrect paint viscosity, and holding the gun too far from the work.
what is used to thin zinc chromate primer? - ✔✔toluene
which federal regulation prescribes the size and location requirements for aircraft
identification number? - ✔✔FAR Part 45
what type of materials should be thoroughly protected when using paint remover? -
✔✔synthetic rubber surfaces, aircraft tires, fabric and acrylics must be protected against
possible contact with paint remover
what is the grip length of a rivet? - ✔✔the grip length is the combined thickness of the
materials to be joined by the rivet
where are special rivets, such as huck or cherry lock rivets used? - ✔✔they are used in
places where access to both sides of the riveted structure is impossible, or where limited
space will not permit the use of a bucking bar. These rivets require special tools, installation,
and removal procedures. They are commonly called blind rivets.
what type of materials are used in honeycomb construction? - ✔✔honeycomb construction
may employ stainless steel, titanium, magnesium, plywood, resin impregnated paper, glass,
nylon, or cotton cloth in various combinations.
what factors are used to determine setback? - ✔✔the radius of the bend and the thickness
of the material. Setback=radius plus thickness
what is a joggle? - ✔✔is an offset formed on an angle strip to allow clearance for a sheet or
extrusion
what are several methods used in forming sheet metal? - ✔✔folding, bumping, crimping,
shrinking and stretching
