Which altitude constraint cannot be entered manually?

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Multiple Choice

Which altitude constraint cannot be entered manually?

When planning the vertical profile, you can specify several types of altitude constraints that the flight management system will honor at waypoints: an altitude that must be reached immediately at the fix (ASAP/immediate), an altitude above field elevation (a minimum crossing altitude relative to the field), or a vertical speed restriction (a target climb or descent rate to reach the altitude by the fix). A block altitude, however, is not something you manually enter. It’s a system-generated constraint used to hold a segment at a fixed altitude for safety and clearance purposes, based on route, ATC data, or airspace/terrain considerations. Because it’s automatically defined by the system rather than entered by the pilot, it cannot be manually set.

When planning the vertical profile, you can specify several types of altitude constraints that the flight management system will honor at waypoints: an altitude that must be reached immediately at the fix (ASAP/immediate), an altitude above field elevation (a minimum crossing altitude relative to the field), or a vertical speed restriction (a target climb or descent rate to reach the altitude by the fix). A block altitude, however, is not something you manually enter. It’s a system-generated constraint used to hold a segment at a fixed altitude for safety and clearance purposes, based on route, ATC data, or airspace/terrain considerations. Because it’s automatically defined by the system rather than entered by the pilot, it cannot be manually set.

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