The correct answer is D. All the above.
A flight information region (FIR) is a controlled airspace extending from the surface to the upper limit of controlled airspace designated by the appropriate authority for flight information and air traffic services. The radius of a control area is 160 km, and the radius of a control zone is 40 km.
A flight information region (FIR) is a controlled airspace extending from the surface to the upper limit of controlled airspace designated by the appropriate authority for flight information and air traffic services. The purpose of an FIR is to provide a safe and efficient environment for air traffic operations. FIRs are typically divided into smaller areas called control zones. A control zone is a defined airspace around an airport or other navigation facility where air traffic control (ATC) services are provided to aircraft. The radius of a control area is 160 km, and the radius of a control zone is 40 km.
The following are some of the services provided by ATC in FIRs:
- Air traffic control (ATC) services: ATC provides separation between aircraft and ensures that they fly safely and efficiently.
- Flight information services (FIS): FIS provides pilots with information about the weather, navigation aids, and other hazards in the FIR.
- Alerting services: ATC provides alerting services to aircraft in distress.
- Search and rescue (SAR) services: ATC provides SAR services to aircraft that are lost or in distress.