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Consider the following pairs of high speed measure and its purpose:

Locking out outboard ailerons - Avoiding aileron reversal

Using inboard ailerons - Applying load where the wing is stiffer

Using spoilers for roll - Providing roll without wing twist

Locking out outboard ailerons - Increasing the roll rate available

How many of the pairs given above are correctly matched?

  • A.Only one
  • B.Only two
  • C.All four
  • D.Only three

Answer: D

Correct answer: Only three

The first three are right. Locking out the outboard ailerons avoids reversal; inboard ailerons apply their load near the stiff root where little twist results; and spoilers give roll without any twisting moment at all.

The fourth is wrong on the purpose. Locking out the outboard ailerons reduces the roll rate available, since the surfaces with the longest moment arm are taken out of use. It is accepted as the price of avoiding reversal, which is why spoilers are brought in to make up the authority.

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