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Path: utzoo!watmath!clyde!burl!ulysses!allegra!alice!ark
From: ark@alice.UUCP (Andrew Koenig)
Newsgroups: net.aviation
Subject: Re: Pressure vs Altitude
Message-ID: <3549@alice.UUCP>
Date: Wed, 10-Apr-85 00:20:09 EST
Article-I.D.: alice.3549
Posted: Wed Apr 10 00:20:09 1985
Date-Received: Wed, 10-Apr-85 06:44:43 EST
References: <14890@mgwess.UUCP>
Organization: Bell Labs, Murray Hill
Lines: 13

> Most Mode 'C' systems use an independant blind encoder which will
> continue to report via mode c/transponder to center or other facility 
> your altitude even if your visual altimeter fails.

> Donald G. Beahm AT & T - Montgomery, Il.

Some do, some don't.  An airplane with a separate blind encoder
is usually placarded as such, presumably so the pilot will
realize there is a way to control altitude even if the primary
altimeter quits.

The airplanes I fly do NOT have blind encoders.  If I flew a lot
of IFR, I would probably invest in a backup altimeter.