From: utzoo!decvax!harpo!eagle!mhtsa!alice!rabbit!ark Newsgroups: net.aviation Title: Re: Losing vacuum pump in IFR Article-I.D.: rabbit.1024 Posted: Wed Jan 5 11:31:20 1983 Received: Thu Jan 6 03:24:15 1983 References: watcgl.93 I think that a third advantage of a backup vacuum pump is that it is much cheaper than an electric attitude indicator. Last time I checked, the only electric attitude indicators available were staggeringly expensive -- starting at something like $7,000! This may well have changed, and I may be wrong, but...