In Brainteaser Quiz #195, we addressed controller and pilot responsibilities for wake-turbulence separation. Both parties know that an aircraft produces the strongest wake turbulence when it is heavy and in which of the following circumstances?


Clean (no flaps, gear up) and slow


Dirty (flaps and gear down) and slow


Clean (no flaps, gear up) and fast


Dirty (flaps and gear down) and sluggish

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