How many levels of flight are there between FL290 and FL410? (non DRVSM)

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Multiple Choice

How many levels of flight are there between FL290 and FL410? (non DRVSM)

Explanation:
In airspace where DRVSM is not in effect, vertical separation must be 2,000 feet. That means you use flight levels spaced by 2,000 feet, which corresponds to stepping the flight level number by 20 (since each flight level represents 1,000 feet). From FL29x to FL41x, the levels you can use are FL290, FL310, FL330, FL350, FL370, FL390, and FL410. That makes seven levels in total. If you were counting only levels strictly between the endpoints, you’d have five, but with the endpoints included the total is seven.

In airspace where DRVSM is not in effect, vertical separation must be 2,000 feet. That means you use flight levels spaced by 2,000 feet, which corresponds to stepping the flight level number by 20 (since each flight level represents 1,000 feet). From FL29x to FL41x, the levels you can use are FL290, FL310, FL330, FL350, FL370, FL390, and FL410. That makes seven levels in total. If you were counting only levels strictly between the endpoints, you’d have five, but with the endpoints included the total is seven.

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