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Re: Ah, give someone a calculator.......
From: Gary LaPook
Date: 2010 Aug 14, 23:20 +0200
From: Gary LaPook
Date: 2010 Aug 14, 23:20 +0200
DUH! 0� to 179�. (Looks like I need a calculator.) gl Gary LaPook wrote: > I'm guessing that the "decent"units you are hinting at are meters. But > then you run into problems with flight levels. To avoid midair > collisions aircraft fly at different flight levels depending on the > direction of flight. Aircraft proceeding generally eastbound, on > magnetic courses of 0� to 189�, fly at odd thousands of feet and > aircraft generally westbound, 180� to 359�, at even thousands of feet. > (Talking about instrument flight rules here, visual flight rules are > similar.) See Federal Flight Regulation 91.179 at: > > http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=fcb7f258c93bc5abf78002493329d3a3&rgn=div8&view=text&node=14:2.0.1.3.10.2.6.45&idno=14 > > > International, ICAO, rules are the same. > > The thousand foot spacing prevents head on mid air collisions by > compensating for inaccuracy in the altimeters and for less than > perfect pilot technique in maintaining assigned altitudes. > > > But if we switched to meters then we would have to space flight levels > 1000 meters apart which is too great since such large spacing is not > necessary for safety and would eliminate 2/3 of all the current flight > levels which would cause more planes to be operating on the few > remaining flight levels making them more crowded and collisions more > likely. And 100 meter spacing would not be great enough spacing given > the above factors. > > So, I think we will just stick to using feet in aviation. > > gl > Marcel Tschudin wrote: >> That's the punishment for using originally some "strange" units. The >> problem wouldn't exist if all would use the same "decent" units ;-) >> >> BTW: I find this Web-page useful for obtaining statistical data from a >> location. The forecasts however don't seem to be very reliable. >> >> Marcel >> >> >> >> >> > > > > >