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  • Time requirement for minimum weather

    I am a bit confused about the time of the minimum weather requirement for the destination aerodrome.
    Q710022 says the IFR flight will not depart unless the conditions are expected to be good enough at the time of arrival,
    where as other questions are talking about a +-1hr time frame.
    I must be missing something. Can you clarify this for me?
    Thank you.

  • #2
    When planning (in the crew room) you must have good weather +-1hr.

    At time of takeoff there must be good weather at dest at time of arrival.

    Hope that helps.

    Comment


    • #3
      Thanks.
      Do you happen to have a reference to where I can find this info?
      I'd just like to see the exact wording as this is still a bit unclear.
      Thank you

      Comment


      • #4
        Hi there In dispatch you are using PLANNING MINIMA, once you leave dispatch, CAT.OP.MPA.245 weather at ETA. ( If you get delayed, you may have to go Planning Minima again) The references are below, hope this is what you want.

        Tom

        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 take-off 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 non-precision 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.245 Meteorological conditions (all aircraft)
        (a) On IFR flights the commander shall only:
        (1) commence take-off
        ; or
        (2) continue beyond the point from which a revised ATS flight plan applies in the event of inflight
        replanning, when information is available indicating that the expected weather conditions, at the time of
        arrival, at the destination and/or required alternate aerodrome(s)
        are at or above the planning
        minima.
        (b) On IFR flights, the commander shall only continue towards the planned destination aerodrome
        when the latest information available indicates that, at the expected time of arrival, the weather
        conditions at the destination, or at least one destination alternate aerodrome, are at or above the
        applicable aerodrome operating minima.
        (c) On VFR flights, the commander shall only commence take-off when the appropriate weather
        reports and/or forecasts indicate that the meteorological conditions along the part of the route to
        be flown under VFR will, at the appropriate time, be at or above the VFR limits.

        Comment


        • #5
          Thank you very much indeed Tom!

          Comment

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