Originally Posted by CAT.OP.MPA.305 Commencement and continuation of approach
(f) The touchdown zone RVR shall always be controlling. If reported and relevant, the midpoint and stopend RVR shall also be controlling. The minimum RVR value for the midpoint shall be 125 m or the RVR required for the touchdown zone if less, and 75 m for the stopend. For aircraft equipped with a rollout guidance or control system, the minimum RVR value for the midpoint shall be 75 m.
Originally Posted by GM1 CAT.OP.MPA.305(f) Commencement and continuation of approach - EXPLANATION OF THE TERM ‘RELEVANT
‘Relevant’ in this context means that part of the runway used during the high-speed phase of the landing down to a speed of approximately 60 kt.
Originally Posted by AMC1 SPA.LVO.100 Low visibility operations LVTO OPERATIONS – AEROPLANES
For a low visibility take-off (LVTO) with an aeroplane the following provisions should apply:
(a) for an LVTO with a runway visual range (RVR) below 400 m the criteria specified in Table 1.A;
(b) for an LVTO with an RVR below 150 m but not less than 125 m:
- (1) high intensity runway centre line lights spaced 15 m or less apart and high intensity edge lights spaced 60 m or less apart that are in operation;
- (2) a 90 m visual segment that is available from the flight crew compartment at the start of the take-off run; and
- (3) the required RVR value is achieved for all of the relevant RVR reporting points;
Note well:
- the provision to "replace" the foremost RVR readout only exists as a note to table 1A, which does not come in play for LVTO 149-125 m.
The idea it might apply to landing is grave lunacy.
- the requirement of 90 m visual segment stands for LVTO 149-125 m, where substitution of the measured RVR value is not allowed.