GM4 CAT.OP.MPA.110 Aerodrome operating minima

CAA ORS9 Decision No. 47

Text in magenta in force from 30 October 2025

MEANS TO DETERMINE THE REQUIRED RVR BASED ON DH AND LIGHTING FACILITIES

The values in Table 9 are derived from the formula below:

Minimum RVR (m) = [(DH/MDH (ft) x 0.3048)/tanα] — length of approach lights (m)

where α is the calculation angle, being a default value of 3.00° increasing in steps of 0.10° for each 10 ft of DH or MDH up to 260 ft, then increasing in steps of 0.10° for each 20 ft of DH or MDH up to 3.77° and then remaining constant. A lower RVR limit of 550 m and an upper RVR limit of 2 400 m have been applied to the table.