30 Questions
In areas of critical airflow, how much fabric overlap seam is typically required when joining fabric ends?
2 to 4 inches
Where are fabric seams usually made on high wing aircraft for a more aesthetically pleasing appearance?
On the top surface
What type of seams are preferable in relation to the line of flight?
Parallel seams
When closing an envelope at certain locations, how should machine-sewn seams be stitched?
Single stitch
Why should thick or protruding leading edge sewn seams be avoided on thin airfoils with a sharp leading edge radius?
To avoid acting as a stall strip
Which factor should be considered when deciding where to overlap fabric for coverage during the blanket method?
Function and final appearance of the covering job
What is used to drain each rib bay of the wings?
Drain holes with grommets
What are sometimes approved in reinforced fabric instead of drain holes with grommets?
Drain holes without grommets
What should gussets made to keep protrusions from coming through the fabric do?
Overlap the area they protect
What are used to reinforce cable guide openings, strut-attach fitting areas, and similar features in the fabric covering?
Gussets
How should gusset material be installed according to most processes?
Preshrunk and cemented in place
What should be used to support the original opening made in the covering fabric?
Gussets
What should be the maximum interval between space notches?
6 inches
For tape less than 3 inches wide, what fraction of the tape width should the notches be?
1/3
Why are space notches used in the tape?
To enhance controllability
What effect does a loose tape have on a fixed surface?
Becomes a spoiler
How should spanwise-sewn seams on a wing's upper or lower surfaces be covered?
With finishing tape at least 3 inches wide
Where can chordwise seams be located?
Only over ribs
How wide should the finishing tape be for an overlapped and doped seam on a wing's leading edge?
4 inches
What is the minimum overlap required for an overlapped and doped seam at the trailing edge?
2 inches
What is the recommended width of the pinked-edge surface tape for a trailing edge seam?
4 inches
How wide should the finishing tape be for a seam on wingtips, wing butts, perimeters of wing control surfaces, and perimeters of empennage surfaces?
3 inches
What is the minimum overlap required for a seam on wingtips, wing butts, perimeters of wing control surfaces, and perimeters of empennage surfaces?
2 inches
What is the overlap requirement for a seam on the perimeter of a wing (except a leading edge) on aircraft with a VNE speed up to and including 150 mph?
1 inch
What must be done before attaching any fasteners to hold the fabric to the rib caps?
Install reinforcing tape of the exact width as the rib cap
Why is it important to use approved rib lacing cord when attaching fabric to the ribs?
To ensure the fabric does not tear
What is the purpose of the rib lacing cord passing completely through the wing from upper surface to lower surface?
To prevent tearing and attach both top and bottom skin to the rib
Why are holes pre-punched through the skin close to the rib caps for rib lacing?
To minimize leverage and prevent tearing
What kind of cord is used for rib lacing, according to the text?
Round cross-section cord
Why should care be taken to eliminate sharp edges before following the wing rib lacing methodology?
To prevent damage to the fabric
Test your knowledge on doped seams and fabric overlaps in aircraft construction. Learn about the correct techniques for creating overlapped and doped span-wise seams on both the leading and trailing edges of a wing.
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