Machine sewn seams in aircraft covering fabrics may be of the following types:

Question

BlackTom AI · Accepted Answer

Folded fell, French fell, or plain overlap.

Relevant knowledge points and concepts:
- Aircraft fabric covering requires seams that are strong, aerodynamic, and that protect raw fabric edges from fraying and moisture. Machine-sewn seams typically used are the plain overlap, folded fell, and French fell because each provides appropriate strength, edge protection, and a smooth external surface when doped or sealed.
- Plain overlap: one panel lays over the other and is stitched along the overlap. It is the simplest machine seam; easy to sew and inspect but leaves a raw edge that must be protected with tape or sealing.
- Folded fell: one edge of a panel is folded under (turned) and then stitched to the other panel. This hides the raw edge and gives a smoother, slightly stronger joint than a plain overlap.
- French fell: both raw edges are folded and trapped within the seam (similar to a flat-fell family seam) and then machine-stitched, producing a very neat, abrasion-resistant, and strong seam commonly used where extra durability is needed.

Step-by-step reasoning:
1. Identify commonly accepted machine-sewn seam types for aircraft fabrics based on durability and edge protection requirements: plain overlap, folded fell, French fell.
2. Compare the function of each: plain overlap provides a basic joined area; folded fell reduces exposed edge and smooths external surface; French fell encloses edges fully and gives the greatest protection and neatness.
3. Conclude that the complete list of acceptable machine-sewn seams includes all three named types.

Why the correct answer is correct:
These three seam types are standard practice in fabric-covered aircraft because they balance ease of construction with necessary strength and protection of raw edges.

Why other options are incorrect:
- "French fell or plain overlap" omits the folded fell, which is a valid and commonly used seam.
- "Folded fell or plain overlap" omits the French fell, which is also a standard machine seam for aircraft fabric.

Final confirmation: therefore the correct choice is "folded fell, French fell, or plain overlap," matching the provided answer.

Machine sewn seams in aircraft covering fabrics may be of the following types:单项选择题

类似问题

(1) Machine sewn seams in aircraft covering fabrics may be of the folded fell or French fell types. (2) A plain lapped seam is never permissible. Regarding the above statements,

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