Skip to content

04.1 Traffic Flow Principles

Training Objective

To provide an understanding of how traffic flows through an ACC sector and how controllers influence that flow.

Key Knowledge

  • Traffic flow vs individual control
  • Predictability and stability
  • Strategic vs tactical control

Operational Application

Controllers shall:

  • Maintain a stable and predictable traffic flow
  • Anticipate traffic patterns and conflicts
  • Apply control measures to prevent disruption

1. Overview

Traffic flow refers to the movement of multiple aircraft through a sector in a structured and manageable manner.

2. Core Content

2.1 Flow Stability

  • Stable flows reduce workload
  • Unstable flows increase complexity

2.2 Predictability

  • Predictable aircraft behaviour improves planning
  • Sudden changes increase risk

2.3 Strategic vs Tactical Control

  • Strategic: planning ahead (10–20 minutes)
  • Tactical: immediate actions

3. Procedures

3.1 Flow Management

  • Controllers shall manage flows, not just individual aircraft
  • Early action shall be taken to prevent congestion

4. Standards

  • Traffic flow shall remain manageable at all times

5. Notes

  • Reactive control leads to instability