WET runway data
I have some data on landing performance (e.g. peak N1 during Thrust reversers usage). I would like to know if the runway was wet at the time of measurement. We want to sort landings into wet & dry to see the difference in TR usage. We have assumed SOPs require TRs to be deployed for all landings (but the supposition is that TRs are used more when wet).
Unfortunately this fact (WET/DRY) wasn't recorded in my data but can I make any assumptions from relative humity values.
From another post ... "A runway is considered 'wet' when the runway surface is covered with water or equivalent, less than 3mm or when there is sufficient moisture on the runway surface to cause it to appear reflective, but without significant areas of standing water."
100% RH means it might rain but has it actually rained?
What should I look for? Is RH recorded on the aircraft somewhere? Alternatively is it a purely ground-based (MET-office) recording?