Inspecting Fabrics Flashcards
What factors influence the rate of deterioration of fabric coverings on an aircraft?
The rate of deterioration depends on the type of operation, climate, storage conditions, and maintenance of a satisfactory surface finish.
What are the three types of inspection panels used in fabric-covered aircraft?
The three types of inspection panels are Wood Frames, Zip Panels, and Spring Panels.
What must be checked periodically to maintain the airworthiness certificate of a light aircraft?
The fabric coverings of light aircraft must be checked at specified periods to retain the Airworthiness Certificate.
List the defects in fabric coverings that require repair.
Defects that require repair include loose finishing tape and reinforcing patches, chafing under fairings, brittleness, cracking, peeling or deteriorated coatings, fabric tears, stone damage, broken or missing rib stringing, mice, rats, insects, animal nests, mould, and fungi.
Describe how Wood Frames work as inspection panels.
Wood Frames are light circular or square frames made from celluloid sheets doped onto the fabric cover at required positions. The fabric inside the frames is cut away, and a serrated edged fabric patch is doped over the hole.
Describe how Zip Panels function as inspection panels.
Zip Panels consist of two zip fasteners sewn into the fabric in the form of a “vee,” with open ends at the apex. They are suitable for locations where frequent inspection or servicing is necessary.
Describe how Spring Panels function as inspection panels.
Spring Panels are designed for use on light aircraft and provide easy access for inspections and servicing.
Why are mechanical devices like punch testers not approved testing devices for aircraft fabrics?
Mechanical devices are not approved because their accuracy depends on the calibration, coating thickness, brittleness, and fabric type. They are used at the engineer’s discretion to form an opinion on the general fabric condition.
How does the Maule Punch Tester work, and what does it measure?
The Maule Punch Tester is a spring-loaded device calibrated in breaking strength. It tests fabric strength by pressing against the fabric while on the aircraft and measures resistance in pounds per square inch (psi).
What should be done if the Maule Punch Tester punctures the fabric?
If the Maule Punch Tester punctures the fabric, further testing is needed. A puncture near the breaking strength suggests the fabric may need replacement.
On which types of fabric are the Seyboth and Maule fabric strength testers designed to be used?
The Seyboth and Maule fabric strength testers are designed for use on cotton and linen-covered aircraft, not modern polyester fabrics.
How does the Seyboth Punch Tester differ from the Maule Punch Tester?
The Seyboth Punch Tester punctures a small hole in the fabric when testing, requiring repair regardless of fabric strength. It has a color-coded calibrated scale, but it is not as popular as the Maule Punch Tester.
