Originally Posted by
Pete O'Tewbe
There may be some confusion here. The -0ft +50ft window is the tolerance for the initiation of the MAP for the purpose of testing and checking. I want to see the candidate initiating the MAP (assuming he is not visual) at or between DA and DA +50 ft. Provided he has done that, I am content for him to descend below DA. Initiation of the MAP below DA or above DA +50 ft is, however, a fail item.
Unless there has been a major sea change, the +50ft is a requirement if the aircraft does
not have a published PEC in the flight manual. From a previous discussion on this:
The 50' addition to an ILS DA relates to Aerodrome Operating Minima, and is described in Jepp Terminal 2.6.2 (page AU-17). The requirement is that operators establish operating minima for each aerodrome, and particularly that operators apply aircraft Pressure Error Correction (should be a table in your Aircraft Flight Manual) or in lieu of this, add 50' to the published DA.