06.4 Crossing Traffic & Level Changes
Training Objective
To safely manage aircraft whose vertical profiles intersect.
Key Knowledge
- Crossing conflict geometry
- Timing of level changes
- Vertical vs lateral solutions
Operational Application
Controllers shall:
- Identify crossing conflicts early
- Apply vertical or lateral solutions as appropriate
- Monitor until conflict is resolved
1. Overview
Crossing traffic presents a high risk of conflict when aircraft climb or descend through occupied levels.
2. Core Content
2.1 Conflict Geometry
- Occurs when aircraft paths intersect vertically and laterally
2.2 Timing
- Early action reduces required intervention
2.3 Solution Options
- Stop climb/descent
- Assign alternative level
- Apply vectoring
3. Procedures
3.1 Conflict Resolution
- Issue level restriction or alternative clearance
- Monitor until separation assured
4. Standards
- Separation shall not be compromised during level change
5. Notes
- Crossing conflicts are a common source of error