How to apply. $20.40 for a printout of your marriage certificate â this is a copy of the information from the registration and contains all the information on the record. Printouts are usually used for genealogy and aren't official documents.
Airplane toilets use an active vacuum instead of a passive siphon, and they are therefore called vacuum toilets. When you flush, it opens a valve in the sewer line, and the vacuum in the line sucks the contents out of the bowl and into a tank.
Most airplanes flight manuals require fuel pumps off after engine shutdown and on only before departure. Usually they don`t explain why they should be off for refuelling. I remember reading somewhere that having the fuel system pressurized will increase refuelling time, but I don`t remember where I read that!