AMC10 CAT.OP.MPA.110 Aerodrome operating minima

CAA ORS9 Decision No. 47

Text in magenta in force from 30 October 2025

CONVERSION OF REPORTED METEOROLOGICAL VISIBILITY TO RVR

(a) A conversion from meteorological visibility to RVR/CMV should not be used:

(1) when reported RVR is available;

(2) for calculating take-off minima; and

(3) for any RVR minima less than 800 m.

(b) If the RVR is reported as being above the maximum value assessed by the aerodrome operator, e.g. ‘RVR more than 1 500 m’, it should not be considered as a reported value for (a)(1).

(c) When converting meteorological visibility to RVR in circumstances other than those in (a), the conversion factors specified in Table 8 should be used.

Table 8

Conversion of reported meteorological visibility to RVR/CMV

Light elements in operation	RVR/CMV = reported meteorological visibility x
	Day	Night
HI approach and runway lights	1.5	2.0
Any type of light installation other than above	1.0	1.5
No lights	1.0	not applicable

 

The text below will replace the text above on 30 October 2025:

CONVERSION OF VISIBILITY TO CMV — AEROPLANES

The following conditions apply to the use of converted meteorological visibility (CMV) instead of RVR:

1. If the reported RVR is not available, a CMV may be substituted for the RVR, except:

   1. to satisfy the take-off minima; or

   2. for the purpose of continuation of an approach in LVOs.

2. If the minimum RVR for an approach is more than the maximum value assessed by the aerodrome operator, then CMV should be used.

3. In order to determine CMV from visibility:

   1. for flight planning purposes, a factor of 1.0 should be used;

   2. for purposes other than flight planning, the conversion factors specified in Table 16 should be used.

Table 16

Conversion of reported VIS to RVR/CMV

Light elements in operation	RVR/CMV = reported VIS x
	Day	Night
HI approach and runway lights	1.5	2.0
Any type of light installation other than above	1.0	1.5
No lights	1.0	not applicable