En route high-altitude charts are used for IFR navigation at or above what altitude?

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Study for the Pilot's Handbook of Aeronautical Knowledge Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

En route high-altitude charts are used for IFR navigation at or above what altitude?

Explanation:
En route charts are organized by altitude because the airways and navigation structure change as you climb. Below 18,000 feet MSL you use low-altitude charts that show Victor airways and the MEA/MOA system suited to shorter segments and VOR-based navigation. At or above 18,000 feet MSL the high-altitude network takes over, featuring Jet routes and other high-altitude routings designed for longer legs and higher speeds. So, for IFR navigation at or above 18,000 feet MSL, you rely on en route high-altitude charts. In standard atmosphere, that boundary roughly corresponds to FL180, which is why the threshold is 18,000 feet MSL.

En route charts are organized by altitude because the airways and navigation structure change as you climb. Below 18,000 feet MSL you use low-altitude charts that show Victor airways and the MEA/MOA system suited to shorter segments and VOR-based navigation. At or above 18,000 feet MSL the high-altitude network takes over, featuring Jet routes and other high-altitude routings designed for longer legs and higher speeds. So, for IFR navigation at or above 18,000 feet MSL, you rely on en route high-altitude charts. In standard atmosphere, that boundary roughly corresponds to FL180, which is why the threshold is 18,000 feet MSL.

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