Air Traffic Management and Separation
What is examined
ATM and separation covers clearances, airspace classification, separation minima, RVSM, wake turbulence, SSR and controller-pilot communications. The exam tests whether you can identify a legal separation and the correct controller action.
Core rules
- An ATC clearance authorises flight under specified conditions; it does not relieve the pilot of responsibility for terrain, weather or traffic avoidance.
- Vertical separation is normally 1,000 ft in RVSM airspace (FL290–FL410) and 2,000 ft outside it.
- Radar separation is normally 5 NM; 3 NM may be used in approved terminal areas. Wake turbulence separation can be greater.
- Lateral separation can be by geography, VOR radials, GNSS route or approved offsets; longitudinal separation by time, distance or Mach number.
- Airspace classes determine clearance, communication and equipment requirements. Controlled airspace requires an ATC clearance.
Worked example
Two IFR aircraft are on the same track. Aircraft A is cleared FL350; aircraft B requests FL360. In RVSM airspace the 1,000 ft difference is legal, so the level can be assigned if traffic and ride conditions allow. If B requests FL355, that is not an assignable level and the 500 ft difference would not meet vertical separation. If a radar controller sees 4 NM between them in a 5 NM environment, separation is lost; the controller must act before the minimum is breached, not after.
Traps
Treating a clearance as a terrain clearance; applying 3 NM everywhere; forgetting wake turbulence categories; using 1,000 ft outside RVSM; assuming SSR identity is separation.