30 Questions
What training aids do STC holders produce to assist with fabric covering procedures?
Instructional manuals and videos
Why is the opportunity to inspect the aircraft during the recovering process considered rare?
Because fabric lasts a long time
What should be considered when selecting the method of fabric attachment during recovering or repairing an aircraft?
The strength and reliability compared to the manufacturer's method
What are the two acceptable methods of fabric covering mentioned in the text?
Blanket and Envelope methods
What is involved in the blanket method of re-covering an aircraft?
Using multiple flat sections of fabric
Why is it important to carefully note the location of inspection covers and drain grommets when removing old fabric from an airframe?
To ensure they are correctly reinstalled later
What is the purpose of using plasticizers in dope formulas for fabric coverings?
To eliminate separation of coatings from the fabric
What is the advantage of properly protecting and coating polyester fabric for aircraft coverings?
It ensures that the fabric lasts indefinitely and is stronger than cotton or linen
What has happened to the use of cotton and linen coverings on United States certificated aircraft?
They are no longer used, and polyester is now the standard
What does a pinked edge on fabric prevent?
Raveling of the fabric edge
What is the purpose of a selvage edge in cloth, tape, or webbing?
To prevent raveling
What is meant by the term 'bias' in relation to fabric?
A cut, fold, or seam made diagonally to warp or fill threads
What is the purpose of suspending a container from one end of the fabric strip?
To measure the breaking strength of the fabric
What action should be taken if the breaking strength of fabric is still uncertain?
Send a sample to a qualified testing laboratory for breaking strength tests
Why do aircraft owners often prefer not to have test strips cut out of the fabric?
Damages caused by removing test strips can affect airworthiness
What is the minimum breaking strength for fabric used in aircraft with a loading VNE speed below 9 lb/sq ft?
> 35 lb
Why must all coatings be removed from the fabric test strip before conducting tests?
To ensure accuracy in breaking strength tests
What was the primary advantage of using fabric covering on an aircraft?
Light weight
What should be done if properly installed and maintained polyester fabric shows appreciable strength degradation?
Repairing or replacing the degraded fabric
What were the two primary disadvantages of fabric coverings on aircraft?
Lack of durability and heavy weight
What materials were the original fabrics used for covering airframes?
Irish linen and cotton
Which coating was known for its extreme flammability when used on aircraft fabric?
Nitrate dope
What issue did builders face due to the tendency of organic fabrics to sag?
Aircraft structure being exposed to the elements
What was the drawback of butyrate dope compared to nitrate dope when used as a fabric coating?
Inferior adhesion to the fabric
What was the purpose of adding butyrate dope coatings to the fabric?
To reduce the overall flammability of the fabric covering
Why did attempts to paint the coated fabric prove unsuccessful?
Due to the inability of paint to adhere well to nitrate dope
How did the addition of aluminum solids to the butyrate coatings benefit the fabric and aircraft structure?
It reflected the sun’s rays and prevented harmful UV rays from penetrating
Why did organic fabrics like cotton or linen have a limited service life on aircraft?
As a result of exposure to elements like sunlight causing degradation
What was the reason for aluminum becoming the material of choice as the aviation industry developed?
As engines became more powerful and aircraft structures more aerodynamic
What issue was not addressed by the mixture of nitrate dope and butyrate dope in regard to fabric degradation?
Deterioration caused by ultraviolet (UV) radiation from the sun
Test your knowledge on various fabrics, treatment systems, and basic covering techniques discussed in a specific chapter. Explore topics such as warp, selvage edges, dope additives, and the advantages of polyester fabric.
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