Chapter 3 Aircraft Fabric

A

(1) Machine sewn seams in aircraft covering fabrics may be of the folded fell or French fell types. (2) A plain lapped seam is never permissible.Regarding the above statements, A) only No. 1 is true. B) both No. 1 and No. 2 are true. C) only No. 2 is true.

B

A correct use for acetone is to A) thin dope. B) remove grease from fabric. C) thin zinc chromate primer.

Form 337

A field approval request is made on FAA _______ ______

Filler

After the fabric sealer is applied, a _________ is used. This contains solids or chemicals that are included to block UV light from reaching the fabric.

B

Aluminum-pigment in dope is used primarily to A) aid in sealing out moisture from the fabric. B) exclude sunlight from the fabric. C) provide a silver color.

Major Alteration

Appendix A also states that changing parts of an aircraft wing, tail surface, or fuselage when not listed in the aircraft specifications issued by the FAA is a __________________ ___________________. This means that replacing cotton fabric with polyester fabric is this.

Major Repair

Fabric re-covering is considered a ____________ ____________

A

Fabric rejuvenator A) restores the condition of dope coatings. B) penetrates the fabric and restores fungicidal resistance. C) restores fabric strength and tautness to at least the minimum acceptable level.

C

Finishing tape (surface tape) is used for what purpose?A) To help prevent "ripple formation" in covering fabric. B) To provide additional anti-tear resistance under reinforcement tape. C) To provide additional wear resistance over the edges of fabric forming structures.

A

How many fabric thicknesses will be found in a French fell seam? A) Four. B) Three. C) Five.

Topcoat

Once the aircraft fabric has been installed, sealed, and fill coat protected, finishing or ____________ are applied to give the aircraft its final appearance.

Fabric Sealer

Paste that surrounds the fibers in the fabric with a protective coating to provide adhesion and keep out dirt and moisture.

Fabric Strength Testers

Seyboth and Maule are what?

Rib Lacing Cord

used to lace the fabric to the wing ribs. It must be strong and applied as directed to safely transfer in-flight loads from the fabric to the ribs.

Drain Grommets

what is used on the underside of the wing to remove water?

A

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 *A) sew with a baseball stitch from the center of the tear out toward the extremity of each leg and then dope on a patch. B) sew from the end of each leg to the center of the tear with a baseball stitch and then dope on a patch. C) re-cover the entire bay in which the tear is located.

B

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 A) speed of the aircraft. B) speed of the aircraft and the maximum wing loading. C) maximum wing loading.

250F

The first bottom layer of fabric on a material, the iron temp must be set to?

350F

The second top layer of fabric on a material, the iron temp must be set to?

B

The strength classification of fabrics used in aircraft covering is based on A) shear strength. B) tensile strength. C) bearing strength.

Inspection Rings

The structure underneath an aircraft covering must be inspected periodically. To facilitate this in fabric-covered aircraft, _____________ ________ are glued or doped to the fabric.

Finishing Tapes

These are applied to all seams, edges, and over the ribs once all of the procedures above have been completed. They are used to protect these areas by providing smooth aerodynamic resistance to abrasion.

Fabric Cement

Used to attach fabric to the airframe

Primer

Utilize the __________ specified by the manufacturer's or STC's instructions. Stops paint from bleeding into the fabric and prevent moisture from entering the structure.

round cross section and flat

What are two kinds of rib lacing cord?

14 CFR part 43, Appendix A

What is the location for acceptable Methods, Techniques, and Practices—Aircraft Inspection and Repair, contains acceptable practices for covering aircraft with fabric?

C

What is used to slow the drying time of some finishes and to prevent blush? A) Rejuvenator. B) Reducer. C) Retarder.

C

When dope-proofing the parts of the aircraft structure that come in contact with doped fabric, which of the following provide an acceptable protective coating? 1.Aluminum foil. 2.Resin impregnated cloth tape. 3.Any one-part type metal primer. 4.Cellulose tape. A) 1 and 2. B) 3 and 4. C) 1 and 4.

C

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 A) 70 percent of its original strength. B) 56 pounds per inch warp and fill. C) 70 percent of the original strength for intermediate fabric.

B

Which of the following is a hazard associated with sanding on fabric covered surfaces during the finishing process? A) Embedding of particles in the finish. B) Static electricity buildup. C) Overheating of the fabric/finish, especially with the use of power tools.

A

Which properly applied finish topcoat is the most durable and chemical resistant? A) Polyurethane. B) Acrylic lacquer. C) Synthetic enamel.

A

Which type of coating typically includes phosphoric acid as one of its components at the time of application? A) Wash primer. B) Zinc chromate primer. C) Epoxy primer.

Bias

a cut, fold, or seam made diagonally to the warp or fill threads.

Pinked Edge

an edge which has been cut by machine or special pinking shears in a continuous series of Vs to prevent raveling.

Cross coat

brushing or spraying where the second coat is applied 90° to the direction the first coat was applied. The two coats together make a single cross coat.

Greige

condition of polyester fabric upon completion of the production process before being heat shrunk.

Blanket Method

involves unrolling fabric directly from the roll, cutting it into pieces that fit the frame, and attaching it to the frame with fabric cement.

Surface Tape

made of polyester material and often preshrunk, is obtained from the STC holder. This tape, also known as finishing tape, is applied after the fabric is installed. It is used over seams, ribs, patches, and edges.

Envelope Method

method, saves time by using precut and pre-sewn __________________ of fabric to cover the aircraft. These must be sewn with approved machine sewing thread, edge distance, fabric fold, etc., such as those specified in AC 43.13-1 or an STC.

Reinforcing Tape

most commonly used on rib caps after the fabric covering is installed to protect and strengthen the area for attaching the fabric to the ribs.

Fill or Weave

the direction across the width of the fabric.

Warp

the direction along the length of fabric.

Selvage Edge

the edge of cloth, tape, or webbing woven to prevent raveling.

Count

the number of threads per inch in warp or filling.

Ply

the number of yarns making up a thread.

Anti-Chafe Tape

used on sharp protrusions, rib caps, metal seams, and other areas to provide a smoother surface to keep the fabric from being torn

Rib Bracing

used on wing ribs before the fabric is installed. It is applied spanwise and alternately wrapped around a top rib cap and then a bottom rib cap progressing from rib to rib until all are braced.

Grommets

used to create reinforced drain holes in the aircraft fabric. Usually made of aluminum or plastic, they are glued or doped into place on the fabric surface. Once secured, a hole is created in the fabric through the center of the grommet.