During a twin-engine aircraft engine failure in cruise, the drift-down procedure involves:

Maintaining current altitude at all costs

Descending to a lower altitude where the aircraft can maintain level flight on one engine

Correct

Immediately descending to FL100

Increasing speed to VMO

Explanation

Drift-down involves a controlled descent to the one-engine-inoperative service ceiling, following optimum speed for best gradient to clear terrain.

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