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From: peterb@pbear.UUCP
Newsgroups: net.aviation
Subject: Re: Re: Pressure vs Altitude
Message-ID: <800002@pbear.UUCP>
Date: Tue, 23-Apr-85 22:22:00 EST
Article-I.D.: pbear.800002
Posted: Tue Apr 23 22:22:00 1985
Date-Received: Fri, 26-Apr-85 09:29:45 EST
References: <458@cepu.UUCP>
Lines: 18
Nf-ID: #R:cepu:-45800:pbear:800002:000:762
Nf-From: pbear!peterb    Apr 23 22:22:00 1985




	Most altitude encoding trasnponders that I know of use a seperate
bellows to drive the transponder. When you upgrade your transponder to
include altitude encoding information, you DO NOT replace the altimiter you
have already. A black box is added that has a connection to the static air
vent. It is fixed at 29.95 inches (I think) and the ATC adjusts for local
barometric changes to come up with your real altitude.

	Therefor your mode C information is still reliable. However if both
fail then you got troubles, but I would never break the MP glass since I
would have no indication of engine performance. The MP guage can predict
engine failure in advance of it actually happening.

						Peter Barada
						ima!pbear!peterb
						ihnp4!inmet!pbear!peterb