Roberts FIR's Airspace 

The Roberts TMA encompass the three principal aerodromes in the FIR (Conakry, Freetown and Roberts), it includes an area bounded by straight line joining the tangents of arcs of circles having radius 100 Nm, centered on Freetown and Roberts VORs.
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Roberts FIR Airspace

Airspace Classification and responsibilities

​Airspace Class	Vertical Limit	​Description	Responsible Unit
A	​Control area (CTA)	Control area (CTA)	​Roberts ACC
C	​Ground to 3000 feet inclusive	​Conakry, Freetown and Roberts CTRs	​Approach control units
D	​3000 feet to FL 150 inclusive	Roberts TMA	​Roberts ACC
G	​Ground to FL150 outside of controlled airspace		​Roberts ACC