Originally Posted by mojito
JW411, in UK you use 1000ft for the approach ban, anywhere else it is OM or equivalent position (such as 4NM point). Approach ban is applicable for both for CATI and CATII/III approaches....Cheers
JAR-OPS 1.405 Commencement and continuation of approach
(a) The commander or the pilot to whom
conduct of the flight has been delegated may
commence an instrument approach regardless of the
reported RVR/Visibility but the approach shall not
be continued beyond the outer marker, or equivalent
position, if the reported RVR/visibility is less than
the applicable minima. (See IEM OPS 1.405(a).)
(b) Where RVR is not available, RVR values
may be derived by converting the reported visibility
in accordance with Appendix 1 to JAR-OPS 1.430,
sub-paragraph (h).
(c) If, after passing the outer marker or
equivalent position in accordance with (a) above, the
reported RVR/visibility falls below the applicable
minimum, the approach may be continued to DA/H
or MDA/H.
(d) Where no outer marker or equivalent
position exists, the commander or the pilot to whom
conduct of the flight has been delegated shall make
the decision to continue or abandon the approach
before descending below 1 000 ft above the
aerodrome on the final approach segment. If the
MDA/H is at or above 1 000 ft above the
aerodrome, the operator shall establish a height,
for each approach procedure, below which the
approach shall not be continued if the
RVR/visibility is less than the applicable minima.
(e) The approach may be continued below
DA/H or MDA/H and the landing may be completed
provided that the required visual reference is
established at the DA/H or MDA/H and is
maintained.
(f) The touch-down zone RVR is always
controlling. If reported and relevant, the mid point
and stop end RVR are also controlling. The
minimum RVR value for the mid-point is 125 m or
the RVR required for the touch-down zone if less,
and 75 m for the stop-end. For aeroplanes equipped
with a roll-out guidance or control system, the
minimum RVR value for the mid-point is 75 m.
My bold
Interesting points to note.
1. It's the Outer Marker for the approach ban, or it's equivalent position, failing that 1000'AGL. No differentiation between 'UK and elsewhere' under JAR Ops as mojito stated.
2. An often overlooked consideration is my last bold text quote about mid point and stop end values of 125m and 75m (for the 737 with no rollout guidance). If your 'slow down' run will enter these parts of the runway then you need to consider the mid and stop end RVRs too.
PP