02.2 FIR, UIR & ACC
Training Objective
To ensure understanding of airspace divisions and control responsibilities within an FIR/UIR structure.
Key Knowledge
- Definition of FIR and UIR
- ACC responsibilities
- Boundaries and lateral limits
- Vertical division of airspace
Operational Application
Controllers shall:
- Provide ATC service within assigned sector of the FIR/UIR
- Coordinate with adjacent FIRs and sectors
- Ensure correct transfer of control
1. Overview
Airspace is divided into regions to define responsibility for air traffic services.
2. Core Content
2.1 Flight Information Region (FIR)
- Defined area where flight information and alerting services are provided
- Usually surface to upper limits
2.2 Upper Information Region (UIR)
- Upper portion of FIR
- Typically above FL245 or as defined locally
2.3 Area Control Centre (ACC)
- Provides en-route ATC services
- Responsible for separation within FIR/UIR
3. Procedures
3.1 Transfer of Control
- Aircraft shall be transferred at agreed coordination points
- Control responsibility shall be clearly defined
3.2 Coordination Principles
- Transfer of control and communication may occur at different points
- Coordination shall be completed prior to boundary transfer
- Estimates shall be passed in accordance with local procedures
4. Standards
- FIR/UIR boundaries defined by ICAO and national authorities
- Controllers shall not provide service outside designated airspace
5. Notes
- Adjacent FIR coordination is critical in high-density regions