When an antenna is installed, it should be fastened

Question

BlackTom AI · Accepted Answer

Antenna attachments must transfer aerodynamic, inertia, and vibratory loads into the aircraft’s structural members so the skin or non-structural components are not overstressed.

1. Relevant knowledge points and concepts
- Aircraft antennas experience aerodynamic forces, vibration, and installation torque; these loads must be carried by structural members. 
- "Primary structure" refers to parts designed to carry flight loads (stringers, frames, longerons, etc.). Secondary structure (skin panels, fairings) is not normally intended to carry concentrated external loads unless reinforced. 
- Reinforcing doublers are used only when local strength of the skin must be increased to distribute loads into structure.

2. Step-by-step reasoning
- An antenna transmits loads to whatever it is fastened to. If bolted only to thin skin or fairing, the skin may crack or deform, causing failure or aerodynamic irregularities. 
- Proper installation routes the antenna loads into the aircraft primary structure so those forces are absorbed by elements designed for them. 
- Therefore, the antenna must be fastened in a way that ensures load path to structure (direct attachment to structural member or through a properly installed doubler that transfers load to structure).

3. Calculations/intermediate steps
- No numerical calculation is required. The “calculation” is structural load path assessment: identify load, trace path from antenna fastener through attachment hardware/doubler into primary structure.

4. Why the correct answer is correct
- The statement "so that loads imposed are transmitted to the aircraft structure" captures the essential engineering requirement: provide a continuous, designed load path into structural members to prevent local failure.

5. Why the other options are incorrect
- "To the primary structure at the approximate intersection of the three aircraft axes" is overly specific and impractical; antennas must be placed where mission requirements dictate, not at that theoretical intersection. 
- "With a reinforcing doubler on each side of the aircraft skin" is sometimes necessary, but not universally required; doublers are used only when needed to distribute load into structure.

6. Conclusion
The correct choice is: so that loads imposed are transmitted to the aircraft structure. This matches the provided answer.

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