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Bus loading describes

  • A.The number of terminals connected
  • B.The physical weight of the wiring
  • C.The proportion of available capacity actually in use
  • D.The electrical current drawn by the terminals

Answer: C

Correct answer: The proportion of available capacity actually in use

Bus loading is the ratio of traffic carried to capacity available, usually expressed as a percentage.

It matters for two reasons. A heavily loaded bus has little margin for later modification, and integrators expect to add functions over an aircraft's life. And as loading rises, queueing delays grow and worst-case latency becomes harder to bound - which is what certification requires. Designers therefore aim well below saturation, commonly around 50 per cent, rather than filling the available capacity.

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