Fabrics
When repairing an "L"-shaped tear in fabric, it is recommended to start the stitching here.
What is the apex?
In composites, this direction of the thread or fiber is known to be at 0 degrees.
What is the warp direction?
The "I"-beam wooden spar is routed for this purpose.
What is to reduce weight?
If required to bend a piece of clear plastic in a straight line, the mechanic would use this recommended tool.
What is a strip heater?
This substance is recommended for removing grease from fabric prior to doping.
What is acetone?
Kevlar is a trade name for this well-known polyamide fiber used in composite reinforcement.
What is aramid?
Pin knot clusters are permitted in wood aircraft structures provided this condition is met.
What is it produces a small effect on grain direction
When making a straight cut into a piece of clear plastic like acrylic, this saw is recommended for the operation.
What is a circular saw?
This is another name for finishing tape as it relates to fabric covering.
What is surface tape?
The simplest composite structure is made by combining these two elements.
What are the matrix and the reinforcing materials?
These are the three forms of wood commonly used in the construction of wooden aircraft.
What are solid wood, plywood, and laminated wood?
This is what happens to cellulose acetates when acetone is applied.
What is softens, but remains clear?
Anti-tear strips are used if the Vne (never-exceed speed) of the aircraft is not in excess of this speed.
What is 250 m.p.h.?
This primary advantage makes fiberglass more widely used than other reinforcing materials.
What is its low cost?
This is not a type of patch used in the repair of a plywood skin.
This substance has better thermal insulation than glass due to its lower thermal conductivity.
What is plastic?
These are examples of organic fabrics used in aircraft coverings.
What is cotton and linen?
This material is the third component often added to increase the compressive strength of a composite structure.
What is core material?
These 3 species of wood are used in wood aircraft structures.
What are Sitka spruce, Douglas fir, and Noble fir?
When cutting plastics, feeding the material into the cutting blade at a slow rate of speed helps avoid this issue.
What is chipping?
When dope-proofing the part of the aircraft structure that will come in contact with doped fabric, this is an acceptable protective covering.
What is aluminum foil or cellulose tape?
This filler material, when added to resins, provides strength for the repair of a damaged hole in a composite panel.
What is flox and chopped fibers?
When patching a plywood skin, abrupt changes in cross-sectional areas which will develop dangerous stress concentrations should be avoided by using
What are circular or elliptical patches?
When installing plastic enclosures or windshields held in place by bolts and nuts, the nuts should be this.
What is tightened to a firm fit, then back off 1 full turn?
Moisture, mildew, chemicals, and acids have no effect on this material, which is also fire resistant.
What is fiberglass?
This material layer is used within the vacuum bag pressure system to absorb excess resin during curing.
What is a bleeder?
In the case of elongated bolt holes in a wood spar or cracks in the vicinity of bolt holes, this action should be taken.
What is a new section of the spar should be spliced in or the spar replaced entirely
Once all dirt and grease are removed from the aircraft windshield, this is the final step to protect it from future contamination.
What is applying a coat of wax?
The strength classification of fabrics used in aircraft coverings is based on this property.
What is tensile strength?
Composite fabric material is considered to be its strongest in this direction.
What is the warp?
The information concerning acceptable species substitutions for wood materials used in aircraft repair can be found here.
What is AC 43.13-1B?
If an aircraft's transparent plastic enclosure exhibits fine cracks in a network over, under, or through the surface, the plastic is said to be this.
What is crazed?
Fungicide dope additives are especially important for fabric-covered aircraft when the fabric is made of this material.
What is organic fabrics?
The length of time that a catalyzed resin will remain in a workable state is called this.
What is pot life?
This is the amount of wood decay allowed in airworthy wooden aircraft structures.
What is any form or amount of decay is not permitted?
This is not a reason we anneal plastic materials.
What is to increase the ductility?
This fabric has 4 fabric thicknesses.
What is French-fell machine-sewn seam?
This classification of fiberglass reinforcement material has high resistivity and is the most commonly used.
What is E-glass?
This is indicated when a joint separates and the glue surface shows only a wood imprint, with no wood fibers attached.
What is glue deterioration?
This is the most common method of cementing transparent plastics.
What is the soak method?