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RVR and Pilot assessment

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  • RVR and Pilot assessment

    Hi,

    I'm having an issue with the the table provided in OP Proc, Lesson 9, page 4 and more specifically :

    *The reported RVR value representative of the initial part of the take off run can be replaced by pilot assessment

    In a question bank (similar to Question ID: 711388 but even more specific) I get the following :

    During LVTO, the reported RVR for the initial part of the take off run is below limit. The take off is :
    Correct answer : Not possible under any circumstances

    So in that case, when does the possibility to replace the reported RVR value would apply ? The EASA wording in PART-OPS clearly allow replacement of a reported value (and not only assessment of a missing value). If the RVR on another part of the runway was below minima, no discussion but when only speaking about the touchdown RVR, I don't see the logic.

  • #2
    Hi there, yes, this seems a little confusing at first. If you only have VIS (and no RVR), or if no RVR or VIS are available, a take-off should only be
    commenced if the commander can determine that the visibility along the take-off runway is equal to or better than the required minimum.


    Where multiple RVR readings are required, they must all be above the applicable minima, except that, all the tables state that *: The reported RVR/VIS
    value representative of the initial part of the take-off run can be replaced by pilot assessment .... but the other 2 readings still have to be above minima.
    So the pilot can make an assessment of TDZ, but not MID-POINT or ROLL OUT.
    Also, if you only have an RVR /VIZ value for the initial part of the take-off run, this can be replaced by pilot assessment

    Hope that makes sense


    AMC1 CAT.OP.MPA.110 Aerodrome operating minima
    TAKE-OFF OPERATIONS AEROPLANES
    (a) General
    (1) Take-off minima should be expressed as visibility or runway visual range (RVR) limits, taking
    into account all relevant factors for each aerodrome planned to be used and aircraft
    characteristics. Where there is a specific need to see and avoid obstacles on departure
    and/or for a forced landing, additional conditions, e.g. ceiling, should be specified.
    (2) The commander should not commence take-off unless the weather conditions at the
    aerodrome of departure are equal to or better than applicable minima for landing at that
    aerodrome unless a weather-permissible take-off alternate aerodrome is available.
    (3) When the reported meteorological visibility (VIS) is below that required for take-off and
    RVR is not reported, a take-off should only be commenced if the commander can determine
    that the visibility along the take-off runway is equal to or better than the required
    minimum.
    (4) When no reported meteorological visibility or RVR is available, a take-off should only be
    commenced if the commander can determine that the visibility along the take-off runway is
    equal to or better than the required minimum.

    Comment


    • #3
      Thank you for the clarification Tom, this makes sense to me.

      Comment

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