August 3, 201411 yr Reading the FCTM about wind additives, as all my approaches are with the autothrottle disengaged. If the weather good I'm reading the example table, but what i'm not understanding or infact is how to do the mathematics for winds other than 360 (rwy heading 360) In the table it shows 060 at 24 so the wind additive is 6? Vref + 6 I'm not sure how they worked that one out? Can anyone help me with this one please? Vernon Howells
August 3, 201411 yr It is simple math using difference in angles and finding the cosine to that angle multiplying by the wind component. Have a look here http://www.theairlinepilots.com/forum/viewtopic.php?p=1639&sid=69f4c769581d01825ee7378032f6d534 Anders Weber ATPL(A) Student EKBI - Billund, Denmark
August 3, 201411 yr The FCTM method calls for adding to Vref one half of the headwind component, plus the total gust differential. Rule of thumb from the FCTM... "One half of the reported steady headwind component can be estimated by using 50% for a direct headwind, 35% for a 45° crosswind, zero for a direct crosswind and interpolation in between." (pg 1.17) Referring to your example, with the wind offset by 60 degrees, one-half of the headwind component could be estimated with the rule of thumb at around 25% of the total wind...25% of 24 knots is 6 knots, so that is the additive they use. Michael Faia
August 5, 201411 yr Author Found an app called Xwind for the iphone Was searching on pprune.org Vernon Howells
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