Page 315 - UK Air Operations Regulations (Consolidated) 201121

Part CAT - ANNEX IV - Commercial Air Transport Operations

aerodrome shall allow a full- stop landing from 50 ft above the threshold within 70 % of the
LDA.
(b) By way of derogation from point (a), and where point CAT.POL.A.355 is complied with, the
landing mass of the aeroplane determined in accordance with point CAT.POL.A.105(a) for
the estimated time of landing at the destination aerodrome shall be such as to allow a full-
stop landing from 50 ft above the threshold within 80 % of the LDA.
(c) When determining the landing mass, the operator shall take the following into account:
(1) the altitude at the aerodrome;
(2) not more than 50 % of the headwind component or not less than 150 % of the
tailwind component;
(3) the type of runway surface;
(4) the runway slope in the direction of landing.
(d) For steep approach operations, the operator shall use landing distance data factored in
accordance with point (a), based on a screen height of less than 60 ft, but not less than
35 ft, and comply with point CAT.POL.A.345.
(e) For short landing operations, the operator shall use landing distance data factored in
accordance with point (a), and comply with point CAT.POL.A.350.
(f) For dispatching the aeroplane, the aeroplane shall either:
(1) land on the most favourable runway, in still air;
(2) land on the runway most likely to be assigned considering the probable wind speed
and direction, the ground-handling characteristics of the aeroplane and other
conditions such as landing aids and terrain.
(g) If the operator is unable to comply with point (f)(2) for the destination aerodrome, the
aeroplane shall only be dispatched if an alternate aerodrome is designated that permits
full compliance with points (a) to (f).
CAT.POL.A.330 AMC1 Landing — dry runways
LANDING DISTANCE CORRECTION FACTORS
(a) Unless otherwise specified in the AFM, or other performance or operating manuals from
the manufacturers, the variable affecting the landing performance and the associated
factor that should be applied to the AFM data are shown in the table below. It should be
applied in addition to the operational factors as prescribed in CAT.POL.A.330 .
(b) The soil should be considered firm when there are wheel impressions but no rutting.

CAT.POL.A.330 AMC2 Landing — dry runways
RUNWAY SLOPE
Unless otherwise specified in the AFM, or other performance or operating manuals from the
manufacturer, the landing distances required should be increased by 5 % for each 1 % of downslope.
CAT.POL.A.330 GM1 Landing — dry runways
LANDING MASS
CAT.POL.A.330 establishes two considerations in determining the maximum permissible landing
mass at the destination and alternate aerodromes.
(a) Firstly, the aeroplane mass will be such that on arrival the aeroplane can be landed within
70 % of the LDA on the most favourable (normally the longest) runway in still air.
Regardless of the wind conditions, the maximum landing mass for an
aerodrome/aeroplane configuration at a particular aerodrome cannot be exceeded.
(b) Secondly, consideration should be given to anticipated conditions and circumstances.
The expected wind, or ATC and noise abatement procedures, may indicate the use of a
different runway. These factors may result in a lower landing mass than that permitted
under (a), in which case dispatch should be based on this lesser mass.
(c) The expected wind referred to in (b) is the wind expected to exist at the time of arrival.
CAT.POL.A.335 Landing — wet and contaminated runways
(a) When the appropriate weather reports or forecasts indicate that the runway at the
estimated time of arrival may be wet, the LDA shall be one of the following distances:
(1) a landing distance provided in the AFM for use on wet runways at time of dispatch,
but not less than that required by point CAT.POL.A.330;
(2) if a landing distance is not provided in the AFM for use on wet runways at time of
dispatch, at least 115 % of the required landing distance, determined in accordance
with point CAT.POL.A.330(a);
(3) a landing distance shorter than that required by point (a)(2), but not less than that
required by point CAT.POL.A.330(a), as applicable, if the runway has specific
friction improving characteristics and the AFM includes specific additional
information for landing distance on that runway type;
(4) by way of derogation from points (a)(1), (a)(2) and (a)(3), for aeroplanes that are
approved for reduced landing distance operations under point CAT.POL.A.355, the
landing distance determined in accordance with point CAT.POL.A.355(b)(7)(iii).
(b) When the appropriate weather reports or forecasts indicate that the runway at the
estimated time of arrival may be contaminated, the landing distance shall not exceed the
LDA. The operator shall specify in the operations manual the landing distance data to be
applied.
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