Structural damage on a fabric covered wing will usually show up as

Question

BlackTom AI · Accepted Answer

A fabric-covered wing that has lost structural integrity will usually develop wrinkles in the fabric because the covering depends on the underlying structure being intact and tensioned.

1) Relevant knowledge points and concepts
- Aircraft fabric is stretched and attached over wing ribs, spars, and stringers; it is taut when the structure is sound. Dope and stitching maintain surface tension.
- Structural damage (broken rib, cracked spar, loose attachment, or distorted frame) changes local geometry or load transfer, reducing support and tension in the fabric.
- Visible surface signs of underlying structural problems include wrinkling, sagging, buckling, or tears in the fabric.

2) Step-by-step reasoning
- The fabric does not carry primary bending loads; it conforms to the shape and is kept under tension by the structure beneath.
- If a rib or attachment point is damaged, the fabric in that area is no longer held at the designed shape/tension.
- Loss of tension causes the fabric to relax and form wrinkles or waves where it has lost support.
- Therefore, structural damage is usually visible externally as fabric distortion (wrinkles).

3) Calculations
- No numerical calculations are required; this is a qualitative structural/visual inspection principle.

4) Why the correct answer is correct
- Wrinkles indicate local relaxation or deformation of the substrate; because the fabric is directly supported by the wing structure, any change in geometry or support will show up as wrinkling. This makes wrinkles a reliable external indicator of internal structural issues.

5) Why the other options are incorrect
- "Scrapes in the paint" are superficial surface damage and, while they may indicate wear, they do not reliably indicate internal structural damage.
- "It won’t show, you have to take the fabric off" is false because many structural defects manifest externally as wrinkling, sagging, or distortion; complete removal is not the usual first step.

6) Conclusion
- The correct answer is "wrinkles in the fabric," which matches the provided answer.

Structural damage on a fabric covered wing will usually show up as 单项选择题

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