Minimum Crossing Altitude deconfliction logic

Jeppesen Enroute data driven charting applications depict Minimum Crossing Altitudes (MCAs) as part of the on airway navaid or enroute airway fix label. In some cases, when there are multiple airways using a single navaid the applicable navaid label will only display the navaid ident regardless of zoom level. This is expected behavior based on deconfliction rules implemented within the application. However, in these cases the MCAs are not displayed as part of the label.

In order to view all applicable MCAs at a navaid when the ident is the only piece of information being displayed a user must turn the airway layer off in order for a more detailed navaid label to be displayed along with the appropriate MCA values.

Jeppesen is actively working to address these deconfliction rules and provide updated rules which will ensure all MCA information is displayed at the appropriate zoom levels.

In the meantime, a complete list of all MCA values along with the applicable crossing direction, airway designator and navaid or fix is provided in a table attached to the alert pdf.