Re: LHR "grooved" Runway?!
answer depends on the authority responsible for your airline. As far as i'm aware the uk caa dont permit the use of dry performance on a wet runway for either grooved or pfc, although your company can apply for a deviance from the regulation for specific reasons. irish authorities do allow it on grooved surfaces and there is mention of it in jar ops if i search hard. why bother though use wet perf coz your company will only try to force you into short strips in the wet if they think your game for it.