The only limitations we show in our WestJet NG SOP's to using Assumed Temperature Method is when the runway is slippery or contaminated. In these cases it is prohibited. Full De-Rate is permitted and is preferred when the runway meets these conditions. We do not apply any penalty to having fluids on our wing. In my opinion, the wing is considered clean at rotation and therefore the amount of thrust applied to attain this speed is inconsequential.
Cheers
Last edited by flywestjetcr; 26th Aug 2008 at 04:13.