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

Question

BlackTom AI · Accepted Answer

Aircraft fabric must retain at least 70% of its original strength before being considered airworthy.

Relevant knowledge points and concepts:
- Fabric-covered airframe components are certified to a specified original strength (tensile/tear strength). 
- Aviation maintenance standards (FAA advisory material and standard practices) set an allowable deterioration limit so structural integrity and safety margins are preserved. 
- "Deterioration" is expressed as a percent reduction from original strength; the minimum acceptable remaining strength = 100% − allowable deterioration.

Step-by-step reasoning:
1. The regulation/standard establishes an allowable deterioration of 30% for aircraft fabric. That means fabric may lose up to 30% of its original strength and still be considered serviceable.
2. Convert allowable deterioration into minimum remaining strength: 100% − 30% = 70%.
3. Therefore, fabric that has deteriorated to a residual strength below 70% of its original strength is unairworthy and must be repaired or replaced.

Calculation example (intermediate steps shown):
- Assume original fabric tensile strength = 100 lb/in (as a baseline).
- Allowable deterioration = 30% of 100 lb/in = 0.30 × 100 = 30 lb/in.
- Minimum allowed remaining strength = 100 − 30 = 70 lb/in = 70% of original.

Why the correct answer is correct:
- The 70% threshold preserves a safety margin consistent with maintenance standards; any lower residual strength compromises structural integrity and is therefore unairworthy.

Why the other options are incorrect:
- 42%: far below the accepted safety threshold; allowing fabric to weaken to 42% would be unsafe and is not permitted.
- 80%: more conservative than required; while fabric at 80% is certainly airworthy, standards permit deterioration down to 70%, so 80% is not the minimum allowable.

Conclusion:
The minimum strength allowed before fabric is considered unairworthy is 70%, which matches the provided correct answer.

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

类似问题

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

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

You own a bond that pays $64 in interest annually. The face value is $1,000 and the current market price is $1,021.61. The bond matures in 11 years. What is the yield to maturity?

Which of the following statements is CORRECT?

It will cost $9,600 to acquire an ice cream cart that is expected to produce cash inflows of $3,600 a year for three years. After the three years, the cart is expected to be worthless. What is the payback period?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单