Aircraft Coverings Review Flashcards
What aircraft covering material has to be tested for tensile strength?
Cotton.
What does the quality, strength, and weight of the aircraft fabric depend on?
Vne speed and the wing loading.
What are the Vne and wing loading of grade A cotton and intermediate cotton?
Grade A: Vne over 160mph and wing loading over 9Ibs/in.
Intermediate: Vne less than 160mph and wing loading less than 9Ibs/in.
What is the minimum tensile strength of grade A cotton and intermediate cotton?
Grade A: 80Ibs/in. Intermediate: 65Ibs/in.
Grade A cotton is airworthy down to what percentage and its new Ibs/in.?
Down to 70% of new, 56Ibs/in.
Intermediate cotton is airworthy down to what percentage and new Ibs/in.?
Down to 70% of new, 46Ibs/in.
What cloth is not affected by moisture, mildew, chemicals or acids?
Glass cloth.
How is finishing tape used?
Placed over seams and ribs to cover the stitchings.
How should finishing tape be cut for compound curves?
In the Bias direction.
How is reinforcing tape used?
It is used between the fabric covering and rib stitching.
What is the tensile strength of hand sewing thread?
14Ibs/in.
What is the tensile strength of machine sewing thread?
5Ibs/in.
What are the two types of grommets?
Plain and seaplane.
What are the four ways of attaching fabric to ribs?
Screws with plastic washers, Martin clamps, pull rivets, and stitching.
What are the advantages of nitrate dope over butyrate?
Lower cost, more weight reduction, and fire resistant.
How do you determine what type of dope is on an aircraft?
While rubbing a section with lacquer thinner, nitrate will become softer immediately, butyrate takes longer.
What is a retarder used for?
To slow down the evaporation of the solvents in the dope.
What is the purpose of aluminum paste?
It shields the fabric from UV rays from the sun.
What does fabric rejuvenator do?
Restores the resiliency of the old dope film.
Why is acetone used on fabrics?
Removes grease from the fabric.
What causes pinholes?
Oil or water in the air supply.
What causes blushing?
High humidity, low temperatures, and drafts over freshly doped surfaces.
What are the four machine sewn seams?
French fell.
Folded fell.
Modified fell.
Lap.
Hand sewn seams must be locked with how many stitches and with what knot?
Every 10 stitches and tied off with a double half hitch.
