Airframe 1
Which of the following are generally characteristic of aramid fiber (Kevlar) composites? 1. High tensile strength 2. Flexibility 3. stiffness 4. corrosive effect in contact with aluminum 5. ability to conduct electricity
1 and 2
Proper pre-preg composite lay-up curing is generally accomplished by... 1. applying external heat 2. room temperature exposure 3. adding a catalyst or curing agent to the resin 4. applying pressure
1 and 4
When dope - proofing the parts of the aircraft structure that come in contact with doped fabric, which of the following provides an acceptable protective coating? 1. Aluminum foil 2. Resin impregnated cloth tape 3. Any one - part type metal primer 4. Cellulose tape
1 and 4
A potted compound repair on the honeycomb can usually be made on damages less than...
1 inch diameter
When repairing puncture type damage of a metal faced laminated honeycomb panel, the edges of the doubler should be tapered to...
100 times the thickness of the metal
Which of the following, when added to wet resins, provide the strength for the repair of damaged fastener holes in composite panels? 1. Microballoons 2. flex 3. chopped fibers
2 and 3
Which of these methods may be used to inspect fiberglass/honeycomb structures for entrapped water? 1. Acoustic emission monitoring. 2. X-ray 3. Backlighting
2 and 3
Which of the following are generally characteristics of carbon/graphite fiber composites? 1. flexibility 2. stiffness 3. high compressive strength 4. corrosive effect in contact with aluminum 5. ability to conduct electricity
2,3 and 4
How many of the following are benefits of using microballoons when making repairs to laminated honeycomb panels? 1. Greater concentrations of resin in edges and corners 2. Improved strength to weight ratio 3. Less density 4. Lower stress concentrations
2,3, and 4
If registration numbers are to be applied to an aircraft with a letter height of 12 inches, what is the minimum space required for the registration mark N1683C? (note: 2/3 X height = character width 1/6 X height = width for 1 1/4 X 2/3 height = spacing
52 inches
What type of bit should be used to drill holes in Plexiglas?
A specifically modified twist drill
Which statement about wood decay is correct?
Decay is not acceptable in any form or amount
When making repairs to fiberglass, cleaning of the area to be repaired is essential for a good bond. The final cleaning should be made using...
MEK (methyl ethyl ketone)
Which statement is true regarding paint system compatibility?
Old wash primer coats may be over coated directly with epoxy finishes
(1) Machine sewn seams in an aircraft covering fabrics maybe of the folded fell or French fell types. (2) A plain lapped seam is never permissible. Regarding the above statements,
Only No. 1 is true
What is the purpose of a gusset or gusset plate used in the construction and repair of aircraft structures?
To join and reinforce intersecting structural members
Finishing tape (surface tape) is used for what purpose?
To provide additional wear resistance over the edges of fabric forming structures
What is the usual cause of runs and sags in aircraft finishes?
Too much material applied in one coat
Which is considered good practice concerning the installation of acrylic plastics?
When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided
What is likely to occur if hydrated wash primer is applied to unpainted aluminum and then about 30 to 40 minutes later a finish topcoat, when the humidity is low?
a glossy, blush - free finish
In cases of elongated bolt holes in a wood spar or cracks in the vicinity of bolt holes,
a new section of spar should be spliced in or the spar replaced entirely.
The installation of Cherrymax and Olympic-lok rivets is accomplished by utilizing...
a pulling tool
Repairing advanced composites using materials and techniques traditionally used for fiberglass repairs is likely to result in...
an airworthy repair
Compression failures in wood aircraft structures are characterized by buckling of the fibers that appear as streaks on the surface...
at right angles to the grain
Threaded rivets (rivnuts) are commonly used to...
attach parts or components with screws to sheet metal
Before applying a protective coating to any unpainted clean aluminum, you should...
avoid touching the surface with bare hands
Cabin upholstery materials installed in current standard category airplanes must...
be at least flame resistant
What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called?
bleeder
Which defect in aircraft finishes may be caused by adverse humidity, drafts or sudden changes in temperature?
blushing
The markings on the head of a Dzus fastener identify the...
body diameter, type of head, and length of the fastener
Alloy 2117 rivets are heat treated...
by the manufactured and do not require heat treatment before being driven
When patching a plywood skin, abrupt changes in cross - sectional areas which will develop dangerous stress concentration should be avoided by using...
circular or elliptical patches
The Dzus turn lock fastener consists of a stud, grommet, and receptacle. The stud length is measured in...
hundredths of an inch
Laminated wood spars may be substituted for solid rectangular spars...
if the same quality wood is used in both
Aluminum - pigment in dope is used to primarily to...
reflect ultralight from the fabric
A correct use for acetone is to...
remove grease from fabric
Fiberglass laminate damage that extends completely through one facing and into the core...
requires the replacement of the damaged core and facing
Fabric rejuvenator is used to...
restore the condition of dope coatings
What is used to slow the drying time of some finishes and to prevent blush?
retarder
The part of a replacement honeycomb core that must line up with the adjacent original is the...
ribbon direction
When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate...
separation of the laminates
The best method of repair for a fabric covered surface which has an L shaped tear, each leg of which is approximately 14 inches long, is to...
sew with a baseball stitch from the center of the tear out toward the extremity of each leg and then dope on a patch
A well designed rivet joint will subject the rivets to...
shear loads
The Dzus turn lock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in...
sixteenths of an inch
What is the most common method of cementing transparent plastics?
soak method
The determining factor(s) for the selection of the correct weight of textile fabric to be used in covering any type of aircraft is the ...
speed of the aircraft and the maximum wing loading
Which of the following is a hazardous associated with sanding on fabric covered surfaces during the finishing process?
static electricity buildup
One method of inspecting a laminated fiberglass structure that has been subjected to damage is to...
strip the damaged area of all paint and shine a strong light through the structure
The strength classification of fabrics used in aircraft covering is used on...
tensile strength
When Balsa wood is used to replace a damaged honeycomb core, the plug should be cut so that...
the grain is perpendicular to the skin
The strength and stiffness of a properly constructed composite buildup depends primarily on...
the orientation of the piles to the load direction
A category of plastic material that is capable of softening or flowing when reheated is described as a...
thermoplastic
One of the main advantages of Hi-lok type fasteners over earlier generations is that...
they can be installed with ordinary hand tools
Pin knot clusters are permitted in wood aircraft structure provided...
they provide a small effect on grain direction
The general rule of finding the proper rivet diameter is...
three times the thickness of the thickest sheet
When installing transparent plastic enclosures which are retained by bolts extending through the plastic material and self-locking nuts, the nuts should be...
tightened to a firm fit, then backed off one full turn
When repairing large, flat surfaces with polyester resins, warping of the surface is likely to occur. One method of reducing the amount of warpage is to...
use short strips of fiberglass in the bonded repair
Composite fabric material is considered to be the strongest in what direction?
warp
What reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric?
warp clock (or compass)
Which type of coating typically includes phosphoric acid as one of its components at the time of application?
wash primer
When necessary, what type of cutting fluid is usually acceptable for marching composite laminates?
water only
Glue deterioration in wood aircraft structure is indicated...
when a joint has separated and the glue surface shows only the imprint of the wood with no wood fibers clinging to the glue
One of the best ways to assure that a properly prepared batch of matrix resin has been achieved is to...
have mixed enough for a test sample
Which fiber or resin (percent) ratio for advanced composite wet lay-ups is generally considered the best for strength?
60:40
When testing the strength of Grade A cotton fabric covering an aircraft that requires only intermediate grade, the minimum acceptable strength the fabric must have is...
70 percent of the original strength for intermediate fabric
Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair?
AC 43.13-1B
How does acoustic emission testing detect defects in composite materials?
By picking up the "noise" of any deterioration that may be present
Which of the following conditions will determine acceptance of wood with mineral streaks?
Careful inspection fails to reveal any decay
When and how is finishing tape applied on a fabric - covered aircraft?
Doped on after the first or second coat of dope
The classification for fiberglass reinforcement material that has high resistivity and is the most common is...
E-glass
Select the alternative which best describes the function of the flute section of a twist drill.
Forms the cutting edges of the drill point
What precaution, if any, should be taken to prevent corrosion inside a repaired metal honeycomb structure?
Prime the repair with a corrosion inhibitor and seal from the atmosphere
The classification for high tensile strength fiberglass used in aircraft structures is...
S - glass
If a new safety belt is to be installed in an aircraft, the belt must conform to the strength requirements in which document?
TSO C22
A faint line running across the grain of a wood spar generally indicates...
compression failure
What is likely to occur if unhydrated wash primer is applied to unpainted aluminum and then about 30 to 40 minutes later a finish topcoat, when the humidity is low?
corrosion
If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surfaces should be...
covered with a thin coat of wax
If an aircraft's transparent plastic enclosure exhibit fine cracks which may extend in a network over or under the surface or through the plastic, the plastic is said to be...
crazing
If masking tape is applied to an aircraft such as for trim spraying, and is left on for several days and / or exposed heat, it is likely that the tape will...
cure to the finish and be very difficult to remove
Fiberglass damage that extends completely through a laminated sandwich structure...
filling with a putty consisting of a compatible resin and clean, short glass fibers
Fungicidal dopes are used in aircraft finishing as the...
first coat to prevent fabric rotting and are thin enough to saturate the fabric
How many fabric thickness will be found in a French fell seam?
four
Moisture, mildew, chemicals and acids have no effect on?
glass fabric
The strength of a well designed and properly prepared wood splice joint is provided by the...
glue
The coefficient of expansion of most plastic enclosure materials is...
greater than both steel and aluminum
Sandwich panels made of metal honeycomb construction are used on modern aircraft because this type of construction...
has a high strength to weight ratio
The preferred way to make permanent repairs on composites is by...
laminating on new repair plies
Fiberglass damage that extends completely through a laminated sandwich structure...
may be repaired
Metal fasteners used with carbon/graphite composite structures...
must be constructed of material such as titanium or corrosion resistant steel
The cantilever wing uses...
no external bracing
A main difference between Lockbolt / Huckbolt tension and shear fasteners (other than their application) is in the...
number of locking collar grooves
The shop head of a rivet should be...
one and a half times the diameter of the rivet shank
Superficial scars, scratches, surface abrasion, or rain erosion on the fiberglass laminates can generally be repaired by applying...
one or more coats of suitable resin (room temperature catalyzed) to the surface
(1) When performing a ring (coin tap) test on composite structures, a change in sound may be due to damage or to transition to a different internal structure. (2) The extent of separation damage in composite structures is the most accurately measured by a ring (coin tap) test. Regarding the above statements,
only No. 1 is true
Laminated wood is sometimes used in the construction of highly stressed aircraft components. This wood can be identified by its...
parallel grain construction
Which properly applied finish topcoat is the most durable and chemical resistant?
polyurethane
Hole filling fasteners (for example, MS 20470 rivets) should not be used in composite structures primarily because of the...
possibility of causing delamination
The length of time that a catalyzed resin will remain in a workable state is called the...
pot life
The I beam wooden spar is routed to...
reduce weight
Which is an identifying characteristic of acrylic plastics?
zinc chloride will have no effect