... The "B" key resets your QNH to standard when above FL180, and to local QNH (taken from FS weather) below FL180. So that should not trigger this pen16, when you are
starting your descend. Actually, with the DA F70/F100 it is the only way to avoid pen16, because the "STD" button only sets the main altimeter, and you get a penalty because the backup altimeter is still set wrongly.
I believe the tolerance for this penalty is only about 500 ft (or was that the Landing lights @ FL100 penalty?). But Andrei is right anyway: You can set your QNH to local anywhere below FL180 when descending. I always plan a continuous climb or descend through the FL100 through FL180 range (when no ATC online
), and do my lights and QNH things in that range. That way you minimalise the chance of getting those penalties. Believe me, I have a PPP score of about -12.000, so I have lots of experience there
Reading Roberto's post, maybe (while descending below FL180) you got blown up to above FL180 after setting your local QNH by a sudden turn of the wind (FSX has very strict wind layers, that can have even opposite wind directions, with hardly any smoothing in between). Unlikely, I know, but it's possible...
P.S. I only know BUSE2P as a SID from LPPT; so that's not an arrival...
P.P.S. At what altitude / Flightlevel did you get the penalty? FL370, or FL190, it makes a difference in this case.