Oral Airframe ASA Exam 2023 With Questions and
Answers
. Which species of wood is considered to be the standard when
comparing other woods for use in aircraft structure? - ANSWER
sitka spruce
What is the basic difference between plywood and laminated
wood - ANSWER the grain direction
laminated wood is parallel, plywood is at 90 degrees or 45 degree
from each other
What kind of glue is recommended for making a repair to a
wooden aircraft structure - ANSWER synthetic resin glue
How is aircraft plywood prepared for making a compound bend -
ANSWER
soak wood in hot water until pliable
How is pressure applied to the glued joint when splicing a wooden
aircraft wing spar - ANSWER clamps
How much pressure must be applied to a glue joint in a piece
of softwood to produce a strong joint - ANSWER 125-150psi
What is the correct repair to a wooden aircraft wing spar if the
wing-attach bolt holes in the spar are elongated - ANSWER splice
in new spar section and drill new holes
8. What kind of repair is recommended for a hole in the plywood skin
of an aircraft wing - ANSWER scarf patch
What is the recommended taper for a splayed patch in a plywood
aircraft skin - ANSWER 5 to 1
What is the recommended taper for a scarf patch in a plywood
aircraft skin - ANSWER 12 to 1
Why should sandpaper never be used when preparing a scarf joint
in a wing spar for splicing - ANSWER dust may clog holes so glue
cannot get in to form proper bonds
2. What is the largest hole in a plywood wing skin that
can be repaired with a fabric patch - ANSWER one inch
,Why are light steel bushings often used in bolt holes in a
wooden wing spar - ANSWER keep spar from being crushed
when bolts tightened
How long should a glue joint be kept under pressure when
splicing a wooden aircraft wing spar - ANSWER 7 hours
Are mineral streaks in a piece of structural aircraft wood reason
for rejecting the wood - ANSWER no, unless there is decay
Which area of a wooden aircraft wing spar must not contain any
splice - ANSWER under wing-attach fittings, landing gear fittings,
engine mount fittings, or lift and interplane strut fittings
How is compression wood identified - ANSWER high specific
gravity, excessive growth of summer wood, little contrast between
spring and summer wood
What is done to a splice in a wooden aircraft wing spar to
strengthen the splice - ANSWER reinforcing plates glued to
both sides
Why must abrupt changes in the cross-sectional area of a
wooden structural member be avoided - ANSWER to avoid
stress concentrations and failure
three types of fabric? - ANSWER cotton, synthetic, glass
What paperwork must be completed if an aircraft that was originally
covered with Grade-A cotton fabric is re-covered using a synthetic
fabric - ANSWER Form 337, STC
What type of rib lacing cord is recommended for attaching
cotton fabric to an aircraft structure - ANSWER waxed linen
cord
How wide should the surface tape be that is used to cover the
trailing edge of an aircraft wing - ANSWER 3inches
Why is the surface tape used on the trailing edge of the control
surfaces of some airplanes notched - ANSWER Since the edges of
this tape face into the wind, it is possible that it could start to lift
and form a very effective spoiler. If the tape is notched, it will tear
off at a notch.
What is the purpose of the reinforcing tape that is used between the
fabric and the rib lacing on an aircraft wing - ANSWER keeps rib
lacing cord from pulling thru fabric
,Should a sewed seam in the fabric used to cover an aircraft wing run
spanwise or
, chordwise - ANSWER either (chord is preferred)
What is the preferred seam used for machine-sewing pieces of
aircraft fabric together - ANSWER frenchfell
What type of material is used for inter-rib bracing in a fabric-covered
aircraft wing
- ANSWERcotton reinforcing tape
What type of knot is used for locking the stitches that are used for
rib lacing on a fabric-covered aircraft wing - ANSWER modified
seine knot
What determines the spacing of the rib lacing stitches on a fabric-
covered aircraft wing - ANSWER never exceed speed
When is the finishing tape applied to a fabric-covered wing
when it is being recovered - ANSWER after second coat of
dope
What type of hand-sewing stitch is used when sewing in a panel of
new fabric on an aircraft fabric-covered wing - ANSWER baseball
stitch, locked every 8-10 inches
. What is the minimum strength to which aircraft fabric is allowed
to deteriorate before it is considered to be unairworthy - ANSWER
70%
What is an antitear strip, and when are they required on a fabric-
covered aircraft - ANSWER An antitear strip is a strip of the
same type of fabric as is used for covering the wings. It is laid over
the rib between the reinforcing tape and the fabric. An antitear strip
is required for aircraft that have a never-exceed speed in excess of
250 miles per hour.
When are drainage grommets applied when an aircraft is being
re-covered - ANSWER into the 3rd coat of dope, same time
as surface tape
Where are drainage grommets located on a fabric-covered aircraft
wing - ANSWER lowest point
How is the strength of the fabric on an aircraft structure
determined - ANSWER punch testser, pull testing a one inch wide
sample of fabric
Why are some portions of the structure of an aircraft dope proofed
before they are covered with fabric - ANSWER to keep fabric from
Answers
. Which species of wood is considered to be the standard when
comparing other woods for use in aircraft structure? - ANSWER
sitka spruce
What is the basic difference between plywood and laminated
wood - ANSWER the grain direction
laminated wood is parallel, plywood is at 90 degrees or 45 degree
from each other
What kind of glue is recommended for making a repair to a
wooden aircraft structure - ANSWER synthetic resin glue
How is aircraft plywood prepared for making a compound bend -
ANSWER
soak wood in hot water until pliable
How is pressure applied to the glued joint when splicing a wooden
aircraft wing spar - ANSWER clamps
How much pressure must be applied to a glue joint in a piece
of softwood to produce a strong joint - ANSWER 125-150psi
What is the correct repair to a wooden aircraft wing spar if the
wing-attach bolt holes in the spar are elongated - ANSWER splice
in new spar section and drill new holes
8. What kind of repair is recommended for a hole in the plywood skin
of an aircraft wing - ANSWER scarf patch
What is the recommended taper for a splayed patch in a plywood
aircraft skin - ANSWER 5 to 1
What is the recommended taper for a scarf patch in a plywood
aircraft skin - ANSWER 12 to 1
Why should sandpaper never be used when preparing a scarf joint
in a wing spar for splicing - ANSWER dust may clog holes so glue
cannot get in to form proper bonds
2. What is the largest hole in a plywood wing skin that
can be repaired with a fabric patch - ANSWER one inch
,Why are light steel bushings often used in bolt holes in a
wooden wing spar - ANSWER keep spar from being crushed
when bolts tightened
How long should a glue joint be kept under pressure when
splicing a wooden aircraft wing spar - ANSWER 7 hours
Are mineral streaks in a piece of structural aircraft wood reason
for rejecting the wood - ANSWER no, unless there is decay
Which area of a wooden aircraft wing spar must not contain any
splice - ANSWER under wing-attach fittings, landing gear fittings,
engine mount fittings, or lift and interplane strut fittings
How is compression wood identified - ANSWER high specific
gravity, excessive growth of summer wood, little contrast between
spring and summer wood
What is done to a splice in a wooden aircraft wing spar to
strengthen the splice - ANSWER reinforcing plates glued to
both sides
Why must abrupt changes in the cross-sectional area of a
wooden structural member be avoided - ANSWER to avoid
stress concentrations and failure
three types of fabric? - ANSWER cotton, synthetic, glass
What paperwork must be completed if an aircraft that was originally
covered with Grade-A cotton fabric is re-covered using a synthetic
fabric - ANSWER Form 337, STC
What type of rib lacing cord is recommended for attaching
cotton fabric to an aircraft structure - ANSWER waxed linen
cord
How wide should the surface tape be that is used to cover the
trailing edge of an aircraft wing - ANSWER 3inches
Why is the surface tape used on the trailing edge of the control
surfaces of some airplanes notched - ANSWER Since the edges of
this tape face into the wind, it is possible that it could start to lift
and form a very effective spoiler. If the tape is notched, it will tear
off at a notch.
What is the purpose of the reinforcing tape that is used between the
fabric and the rib lacing on an aircraft wing - ANSWER keeps rib
lacing cord from pulling thru fabric
,Should a sewed seam in the fabric used to cover an aircraft wing run
spanwise or
, chordwise - ANSWER either (chord is preferred)
What is the preferred seam used for machine-sewing pieces of
aircraft fabric together - ANSWER frenchfell
What type of material is used for inter-rib bracing in a fabric-covered
aircraft wing
- ANSWERcotton reinforcing tape
What type of knot is used for locking the stitches that are used for
rib lacing on a fabric-covered aircraft wing - ANSWER modified
seine knot
What determines the spacing of the rib lacing stitches on a fabric-
covered aircraft wing - ANSWER never exceed speed
When is the finishing tape applied to a fabric-covered wing
when it is being recovered - ANSWER after second coat of
dope
What type of hand-sewing stitch is used when sewing in a panel of
new fabric on an aircraft fabric-covered wing - ANSWER baseball
stitch, locked every 8-10 inches
. What is the minimum strength to which aircraft fabric is allowed
to deteriorate before it is considered to be unairworthy - ANSWER
70%
What is an antitear strip, and when are they required on a fabric-
covered aircraft - ANSWER An antitear strip is a strip of the
same type of fabric as is used for covering the wings. It is laid over
the rib between the reinforcing tape and the fabric. An antitear strip
is required for aircraft that have a never-exceed speed in excess of
250 miles per hour.
When are drainage grommets applied when an aircraft is being
re-covered - ANSWER into the 3rd coat of dope, same time
as surface tape
Where are drainage grommets located on a fabric-covered aircraft
wing - ANSWER lowest point
How is the strength of the fabric on an aircraft structure
determined - ANSWER punch testser, pull testing a one inch wide
sample of fabric
Why are some portions of the structure of an aircraft dope proofed
before they are covered with fabric - ANSWER to keep fabric from
