What is an antitear strip

a covering patch
a strip under the fabric cover and the reinforcing tape
a strip of the same fabric used to cover the aircraft, used to prevent fabric tearing or lace breaking

Question

What is an antitear strip

a covering patch
a strip under the fabric cover and the reinforcing tape
a strip of the same fabric used to cover the aircraft, used to prevent fabric tearing or lace breaking

BlackTom AI · Accepted Answer

An antitear strip is a longitudinal strip of the same aircraft covering fabric, installed to prevent the fabric from tearing and to protect the lacing or stitching that holds the cover in place.

1) Relevant knowledge points and concepts
- Fabric-covered aircraft surfaces are covered and doped with textile material that must be laced, stitched, or taped at edges and attachment points. 
- Stress concentration at lacing holes, rib edges, and control-surface seams can cause tears to start and propagate. 
- An antitear strip is a reinforcement element made from the same covering fabric so it shrinks and behaves identically when treated (doped/heat-shrunk), avoiding differential stresses.

2) Step-by-step reasoning
- The function named (“antitear”) implies prevention of tearing, so the correct component must be a reinforcement, not a simple repair patch.
- Using the same fabric ensures compatibility in shrinkage, flexibility, and adhesion—critical for long-term performance of the cover.
- The strip is positioned along the laced or high-stress edge so loads from lacing are spread along the fabric rather than concentrated at a single point, reducing both fabric tear initiation and lace/cord failure.

3) Calculations/intermediate steps
- No numerical calculation is required; engineering logic about load distribution and material compatibility applies. Conceptually: reducing local stress concentration by increasing the area carrying the load lowers the stress intensity factor and reduces tear propagation.

4) Why the correct answer is correct
- The provided answer specifically identifies a strip of the same covering fabric used to prevent fabric tearing or lace breaking—this matches textbook definitions of an antitear strip: same-material reinforcement aligned with laced edges.

5) Why the other choices are incorrect
- “A covering patch” describes a localized repair piece, not a continuous reinforcing strip used proactively along laced edges. 
- “A strip under the fabric cover and the reinforcing tape” is misleading: reinforcing tape is typically an external tape over seams; an antitear strip’s defining feature is being the same fabric and placed to distribute lacing loads, not merely being “under tape.”

6) Conclusion
Therefore, the correct description is “a strip of the same fabric used to cover the aircraft, used to prevent fabric tearing or lace breaking,” which matches the provided answer.

What is an antitear strip a covering patch a strip under the fabric cover and the reinforcing tape a strip of the same fabric used to cover the aircraft, used to prevent fabric tearing or lace breaking单项选择题

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