Interval Management Clearance Types
RTCA’s DO-328B defines multiple clearance types that may (in the future) be used by Air Traffic Controllers to space aircraft. Here’s a quick summary. Further details can be obtained from RTCA.
| Clearance Type | Relevant Class |
|---|---|
| Achieve-by Then Maintain (time) | IMTimeBasedAchieve |
| Achieve-by Then Maintain (dist) | IMDistBasedAchieve |
| Capture Then Maintain (time) | IMKinematicTimeBasedMaintain |
| Capture Then Maintain (dist) | IMKinematicDistBasedMaintain |
| Final Approach Spacing | IMKinematicAchieve |
| IM Turn | Read IM Turn Overview |
| Maintain Current Spacing (time) | IMKinematicTimeBasedMaintain |
| Maintain Current Spacing (dist) | IMKinematicDistBasedMaintain |