mm of Hg, as an expression of pressure is not SI either. It's too bad about the $2,000 Duncan -----Original Message----- From: [EMAIL PROTECTED] <[EMAIL PROTECTED]> To: U.S. Metric Association <[EMAIL PROTECTED]> Date: March 23, 2002 10:26 Subject: [USMA:19005] mm a standard US unit?
>Shouldn't that be since 1866? >Markus > >----- Original Message ----- >From: <[EMAIL PROTECTED]> >To: "Metric4US" <[EMAIL PROTECTED]> >Sent: Friday, March 22, 2002 9:02 PM >Subject: IT JUST DOES NOT MAKE SENSE!! > > >> I have just imported 5 Small used British aircraft for operation in the >USA. >> I am told by the FAA that the units of barometric pressure in mm of >mercury >> used to set the altimeters are not in "standard US units of measurement". >> Accordingly, I have to degrade a perfectly good system of measurement of >> barometric pressure to meet the interpretation of Federal Aviation >> Regulations at a cost of nearly $2,000. The atimeters will then read in >> inches of Mercury. >> >> The Federal Aviation Regulations quote "All measurements are (to >be)converted >> to standard U.S. units of measure for those instruments necessary for >> operation in the U.S. traffic system" >> >> Any one have a respected reference thet lists mm as a standard U.S. unit >?? >> >> Heeeelp! >> >> George V Crowe >> >
