Which statement is true?

Question

BlackTom AI · Accepted Answer

Both statements are true because lacing wire spacing and orientation relate directly to aerodynamic loads and structural load paths.

1) Relevant knowledge points and concepts
- Dynamic pressure (and aerodynamic load) scales with the square of airspeed: q = 1/2 ρ V^2. Higher VNE (never-exceed speed) increases design and service loads on wing components.
- Lacing wires (or lacing stitches) connect and brace ribs, stringers, and spars; their spacing and orientation affect buckling resistance and load distribution.
- Proper lacing orientation aligns the load path to the spar and avoids introducing bending or torsional loads that could weaken the assembly.

2) Step-by-step reasoning
- Because aerodynamic pressure increases with V^2, components that resist those pressures (including rib laces) must be sized/ spaced to handle the worst-case dynamic loads at or below VNE.
- Therefore maintenance/assembly manuals specify maximum spacing for lacing stitches based on the aircraft’s VNE category: higher VNE → closer spacing or stronger lacing.
- Rib laces are intended to transfer and stabilize loads parallel to the spar; running them parallel ensures even load sharing along the spar and minimizes eccentric loads or local bending.

3) Simple quantitative illustration
- If VNE increases from 100 kt to 140 kt, dynamic pressure factor scales as (140/100)^2 = 1.96 ≈ 2. So aerodynamic loads nearly double; lacing must resist ~2× the load, implying spacing/strength requirements change accordingly.

4) Why the correct answer is correct
- The first statement is true because spacing must account for aerodynamic loads tied to VNE. The third statement is true because orientation parallel to the spar provides the correct structural load path and prevents harmful stresses.

5) Why the other options are incorrect
- Choosing only "Lacing stitch spacing depends on the VNE of the aircraft" ignores the fact that rib lace orientation requirement is also true.
- Choosing only "Rib laces must be parallel to the spar" ignores the valid dependence of spacing on VNE.
- The only complete, correct choice is that both statements are true.

6) Conclusion
Both statements are true, which matches the provided answer: both statements are true.

Which statement is true? 单项选择题

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