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You are here: home->pvt_plt->H749->2.3.3.3.2.A.1
3332
Ground resonance is most likely to develop when
| | A) on the ground and harmonic vibrations develop between the main and tail rotors. |
| * | B) a series of shocks causes the rotor system to become unbalanced. |
| | C) there is a combination of a decrease in the angle of attack on the advancing blade and an increase in the angle of attack on the retreating blade. |
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Anonymous says: |
17 Sep 2008 |
The explanation should read: The wording of the question is misleading. As currently stated with the word 'category' being singular, the answer would be [B] because the listed classes are all in one category. If the question were stated "... which are categories of aircraft?" the correct answer would be [A] because these are all separate categories of aircraft.
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