Aircraft fabric is allowed to deteriorate to what percent of its original strength?
70%
80%
42%

Question

BlackTom AI · Accepted Answer

Aircraft fabric must retain at least 70% of its original strength to be considered airworthy.

1) Relevant knowledge points and concepts
- Aircraft fabric coverings degrade from UV, moisture, chemicals, mechanical wear and aging. 
- Maintenance standards and advisory guidance specify a minimum remaining strength percentage to ensure structural safety and adequate margin against loads.
- Inspectors evaluate fabric by visual inspection and by strength testing (e.g., sample tear or tensile tests) compared to original (or nominal) strength.

2) Step-by-step reasoning
- Begin with the accepted regulatory/maintenance threshold: fabric may be allowed to deteriorate, but only to a specified fraction of its original strength before replacement is required.
- That threshold balances safety margins and practical service life: it is high enough to maintain structural integrity but low enough to allow usable service life.
- The commonly referenced and correct threshold used in maintenance guidance is 70%.

3) Calculation example with intermediate steps
- If original fabric tensile strength = 1,000 lb/in:
  - 70% remaining strength = 1,000 × 0.70 = 700 lb/in.
- If an inspection/tensile test shows 650 lb/in:
  - 650 < 700 so the fabric has deteriorated below the allowable limit and must be repaired or replaced.
- If test shows 800 lb/in:
  - 800 ≥ 700 so the fabric is acceptable.

4) Why the correct answer is correct
- The 70% figure is the established allowable deterioration criterion used in aircraft fabric maintenance guidance to ensure an adequate safety margin. It represents the minimum remaining strength acceptable before mandatory replacement.

5) Why the other options are incorrect
- 80%: too conservative relative to the accepted maintenance threshold; would shorten practical service life unnecessarily.  
- 42%: far below safe limits and would allow dangerously weakened fabric to remain in service.

6) Conclusion
- The correct and accepted allowable deterioration is 70%, which matches the provided answer.

Aircraft fabric is allowed to deteriorate to what percent of its original strength? 70% 80% 42%单项选择题

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What is the minimum strength to which aircraft fabric is allowed to deteriorate before it is considered unairworthy?

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