MIAs are used for which types of routes?

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Multiple Choice

MIAs are used for which types of routes?

MIAs are used when the flight path isn’t on a published airway—direct routes or when ATC vectors you to fly a heading. In those cases there isn’t a published altitude along the path to guarantee obstacle clearance, so you rely on the minimum IFR altitude to ensure you won’t hit terrain or obstacles. On published airways, you follow the published altitudes such as the minimum enroute altitude (MEA), not the MIA. VFR flight planning uses weather and visibility minimums, not MIAs. And en route altitude determinations in general are handled by MEAs and other airway-specific rules, not MIAs. So MIAs apply to off-airway vectors and direct routes.

MIAs are used when the flight path isn’t on a published airway—direct routes or when ATC vectors you to fly a heading. In those cases there isn’t a published altitude along the path to guarantee obstacle clearance, so you rely on the minimum IFR altitude to ensure you won’t hit terrain or obstacles. On published airways, you follow the published altitudes such as the minimum enroute altitude (MEA), not the MIA. VFR flight planning uses weather and visibility minimums, not MIAs. And en route altitude determinations in general are handled by MEAs and other airway-specific rules, not MIAs. So MIAs apply to off-airway vectors and direct routes.

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