68% need theory help based in Sydney determining landing weight on a chart do you add the wind they provide you in the TAF

Hey mate,

68% is very close to getting you across the line, you'll nail it next time.

From my understanding you use NIL wind for landing performance when using a TAF (CAO 20.7.4.4.1). Wind only comes into play when using Ambient conditions (15 min before take off) because you are at the field and can observe the conditions in real time.

Someone more experienced will be able to give you a clearer answer.

Cheers,

Dan.

Notwithstanding a literal reading of the CAO, the aim is to be conservative in determining the LW limited takeoff weight or local landing weight when you are in the descent/approach phase. Three cases to consider

(a) for pre-departure the landing limited TOW generally is determined for nil wind on the longest usable runway per the CAO so that you don't get caught out if the expected helpful headwind dies. There is one case where this won't apply -

(b) if there is only a single runway direction usable (eg single runway one-way operation due, say, slope or terrain) and the forecast is for a tailwind on that runway, then the appropriate plan is to work on the forecast tailwind so that you don't get caught out if the forecast tailwind doesn't die.

(c) if you are local and the wind is a reasonable known, then there is no reason why the forecast wind, adjusted down if you see fit, should not be used for planning a LW.