Aircraft covering

Question 1

What determines the required quality and strength of fabric that is to be used for covering Aircraft

Answer 1

Is determined by the pounds per square foot of the wing load, and the never exceed airspeed of the aircraft

Question 2

When are anti-tear strips recommended and where are they used

Answer 2

Installed over the ribs, longerons, and stringers but are under the reinforcing tape before the Fabric is installed. They are recommended for all areas in the slipstream

Question 3

What is the maximum permissible deterioration of aircraft fabric before it is considered unairworthy

Answer 3

Fabric covering is considered an airworthy when it deteriorates more than 30% from its original required tensile strength

Question 4

What should be the strength of the fabric used for recovering an aircraft

Answer 4

All fabric, surface tape, reinforcing tape, thread and lacing cord used to recover or repair an aircraft covering should be of high-grade aircraft textile material. The material should be at least as good quality and of equivalent strength as those originally used by the aircraft manufacture

Question 5

What is the purpose and location of drain grommets in an aircraft fabric

Answer 5

They allow the condensed moisture to leave the aircraft as well as furnish ventilation. Drain grommets are located on the underside of the airfoils and the trailing edge as close to the rib as practical, And at the lowest point along the center of the underside of each fuselage bay

Question 6

How are drain grommets installed in aircraft fabric

Answer 6

Brass grommets should be mounted on fabric patches and then doped in the covering. Plastic grommets are doped directly to the covering. Both types are installed with a second coat of dope, and the drain holes are opened by cutting out the fabric in the center of the grommet

Question 7

Name the methods of applying fabric to the aircraft wing

Answer 7

Blanket and envelope method

Question 8

What is the purpose of reinforcing tape

Answer 8

Used under all stitching and prevents the stitching cord from tearing through the fabric

Question 9

What type of fabric is not affected by moisture or mildew

Answer 9

Fiberglass fabric

Question 10

What methods are used to check the strength of the doped fabric

Answer 10

A fabric punch test

But if the punch tester indicates that the fabric strength is marginal, and laboratory test should be performed to determine the actual strength of the fabric

Question 11

What type of machine sewed seems are used in aircraft coverings

Answer 11

Plain overlap seems, folded fell seems, and trench fell seems

Question 12

What should be done with structures that will come into contact with dope fabric

Answer 12

Protective coating such as aluminum foil, dope proof paint, or cellulose tape

Question 13

If the original rib stitch spacing cannot be determined when recovering an aircraft, Where can you find the ribs stitch spacing that should be used

Answer 13

Chart in the AC 43.13-1B

Question 14

What is the standard tie off not use during ribs stitching

Answer 14

A modified seine Knot is used to tie off all stitches except the starting stitch

Question 15

What do you call the edge of cloth, tape, or webbing that has been woven to prevent raveling

Answer 15

Selvage edge

Question 16

The type of fabric used for covering aircraft are organic and synthetic. Name two organic and two synthetic types

Answer 16

Organic fibers are cotton and linen

Synthetic fibers include fiberglass and heat shrinkable synthetic fibers such as nylon and Dacron

Question 17

When covering aircraft, where is the surface tape used

Answer 17

So it seams, lapped edges, And all stitching is covered with the surface tape. The surface tape has a pinked edge to prevent unraveling during the installation process

Question 18

Name the advantage of using the envelope method to cover fabric Aircraft

Answer 18

It saves labor because Practically all sewing is done by machine. It is similar to putting a sock over a wing the only stitching left to do would be the structure

Question 19

How are wrinkles removed from cotton fabric

Answer 19

By wetting the wrinkles and allowing to dry

Question 20

When is finishing tape applied

Answer 20

After the second coat of dope is dry, and the nap has been sanded away

Question 21

How wide should the surface tape be when used to cover the trailing edge of an aircraft wing

Answer 21

3 inches

Question 22

What is recommended type of repair for an L-shaped tear when the legs are more than 14 inches long

Answer 22

A doped on patch, as long as they never exceeded velocity is less than 150 mph