Page 276 - UK Air Operations Regulations 201121

Part CAT - ANNEX IV - Commercial Air Transport Operations

instrument approach procedure that does not rely on GNSS is available either at that aerodrome or at
the destination aerodrome.
CAT.OP.MPA.182 GM1 Destination aerodromes — instrument approach operations
INTENT OF AMC1
(a) The limitation applies only to destination alternate aerodromes for flights when a
destination alternate aerodrome is required. A take-off or en route alternate aerodrome with
instrument approach procedures relying on GNSS may be planned without restrictions. A
destination aerodrome with all instrument approach procedures relying solely on GNSS
may be used without a destination alternate aerodrome if the conditions for a flight without
a destination alternate aerodrome are met.
(b) The term ‘available’ means that the procedure can be used in the planning stage and
complies with planning minima requirements.
CAT.OP.MPA.185 Planning minima for IFR flights — aeroplanes
(a) Planning minima for a take-off alternate aerodrome
The operator shall only select an aerodrome as a takeoff alternate aerodrome when the
appropriate weather reports and/or forecasts indicate that, during a period commencing
one hour before and ending one hour after the estimated time of arrival at the aerodrome,
the weather conditions will be at or above the applicable landing minima specified in
accordance with CAT.OP.MPA.110. The ceiling shall be taken into account when the only
approach operations available are nonprecision approaches (NPA) and/or circling
operations. Any limitation related to OEI operations shall be taken into account.
(b) Planning minima for a destination aerodrome other than an isolated destination aerodrome
The operator shall only select the destination aerodrome when:
(1) the appropriate weather reports and/or forecasts indicate that, during a period
commencing one hour before and ending one hour after the estimated time of arrival
at the aerodrome, the weather conditions will be at or above the applicable planning
minima as follows:
(i) RVR/visibility (VIS) specified in accordance with CAT.OP.MPA.110; and
(ii) for an NPA or a circling operation, the ceiling at or above MDH; or
(2) two destination alternate aerodromes are selected.
(c) Planning minima for a destination alternate aerodrome, isolated aerodrome, fuel en-route
alternate (fuel ERA) aerodrome, en-route alternate (ERA) aerodrome
The operator shall only select an aerodrome for one of these purposes when the
appropriate weather reports and/or forecasts indicate that, during a period commencing
one hour before and ending one hour after the estimated time of arrival at the aerodrome,
the weather conditions will be at or above the planning minima in Table 1.

CAT.OP.MPA.185 GM1 Planning minima for IFR flights — aeroplanes
PLANNING MINIMA FOR ALTERNATE AERODROMES
Non-precision minima (NPA) in Table 1 of CAT.OP.MPA.185 mean the next highest minima that apply in
the prevailing wind and serviceability conditions. Localiser only approaches, if published, are
considered to be non-precision in this context. It is recommended that operators wishing to publish
tables of planning minima choose values that are likely to be appropriate on the majority of occasions
(e.g. regardless of wind direction). Unserviceabilities should, however, be fully taken into account.
As Table 1 does not include planning minima requirements for APV, lower than standard (LTS) CAT I
and other than standard (OTS) CAT II operations, the operator may use the following minima:
(a) for APV operations — NPA or CAT I minima, depending on the DH/MDH;
(b) for LTS CAT I operations — CAT I minima; and
(c) for OTS CAT II operations — CAT II minima.
CAT.OP.MPA.185 GM2 Planning minima for IFR flights — aeroplanes
AERODROME WEATHER FORECASTS

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