Originally Posted by
Driver 170
I’m interested in knowing what is the usual FLUID / WATER ration when carrying out a Step 1 de-icing if there is contamination on the upper wings (hoar frost) during the night but NO precipitation falling?
Would 100/0 be good enough or 75/25 ?
Also how many litres does it take roughly to remove all contaminates from a 737 NG wing?
Guidelines simply state that the Type 1 Fluid/Water mixture must be such that the freezing point of the mixture is at least 10C below the OAT.
You'd probably be looking at 2-300 litres at a guess. Depends on the contaminant and the rig operator.
In the UK you're more likely to use Type 2 or Type 4 fluid.