The required strength and quality of aircraft fabric is determined by the pounds per square foot of WING LOADING, and the never-exceeded AIRSPEED of the aircraft.
What determines the required quality and strength of fabric that is to be used for covering aircraft?
Anti-tear strips are used on aircraft with never-exceeded speeds in excess of 250 mph, and they are installed over the RIBS under the reinforcing tape. They are recommended for the complete upper surface of the wings, and on the bottom surface of that par
When are anti-tear strips' recommended, and where are they used?
Fabric covering is considered unworthy when it deteriorates more than 30 percent from its
originally required tensile strength.
What is the maximum permissible DETERIORATION of aircraft fabric before it is considered unworthy?
All fabric surface tape, reinforcing tape, thread and lacing cord used to re-cover or repair
aircraft cover should be of high-grade aircraft textile material. The materials must be at least as
good a quality and of equivalent strength as those originally
What should be the strength of the fabric used for re-covering an aircraft?
Drain grommets are located on the underside of airfoils at the trailing edge as close to the rib as practical, and at the LOWEST point along the center of the underside of the fuselage bay. They allow the condensed moisture to leave the aircraft as well a
What is the purpose, location, and the method of installing drain grommets in aircraft fabric?
Reinforcing tape is used over ribs between the fabric covering and the rib stitching to prevent the stitching cord from cutting through the fabric.
What is the purpose of REINFORCING TAPE?
FIBERGLASS
What type of fabric is not affected by moisture and mildew?
Fabric PUNCH TESTERS will provide a general indication of the strength of the fabric, but if a punch tester indicates that the fabric strength is marginal, a laboratory test should be performed to determine the actual strength of the fabric.
What methods are used to check the strength of DOPED FABRIC?
Plain overlap seams, folded-fell seams, and French-fell seams.
What type of machine-sewed seams are used in aircraft coverings?
Treat all parts of the structure that will come in contact with doped fabric with a protective
coating such as aluminum foil, dope proof paint, or cellulose tape.
What should be done with structure that will come in contact with doped fabric?
Use the rib stitch spacing chart in Advisory Circular 43.13-1B.
If the original rib stitch spacing cannot be determined when re-covering an aircraft, what rib stitch spacing should be used?
3 sided pre-sewn piece; open on one end for ease of installation when re-covering.
What is a fabric envelope?
A modified seine knot is used to tie off all stitches except the starting stitch.
What is the standard tie-off knot used during rib stitching?
Selvage edge
What do you call the edge of cloth, tape, or webbing that has been woven to prevent raveling?
The organic fibers are COTTON and LINEN. The synthetic fibers include FIBERGLASS and heat shrinkable synthetic fibers such as NYLON, ORLON and DACRON.
The types of fabric used for covering aircraft are ORGANIC and SYNTHETIC. Name 2 organic and 2 synthetic fibers.
Sewed seams, lapped edges, and rib stitching or screws must be covered with pinked-edge surface tape.
When covering aircraft, where is surface tape used?