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From: alb@alice.UUCP (Adam L. Buchsbaum)
Newsgroups: net.columbia
Subject: Updated Engine Abort Sequence
Message-ID: <2877@alice.UUCP>
Date: Tue, 26-Jun-84 22:55:47 EDT
Article-I.D.: alice.2877
Posted: Tue Jun 26 22:55:47 1984
Date-Received: Thu, 28-Jun-84 03:58:30 EDT
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 11

NASA this afternoon corrected the statement that Engines
3 and 2 fired, Engine 1 had the problem, and 3 and 2 then
shut down.  What happened was this:

The firing sequence is (in order) Engine 3, then 2, then
1, at 120 millisecond intervals.  The primary hydrogen fuel
valve for Engine 3 never opened; thus, Engine 3 never ignited.
Engine 2 ignited for a brief time and was shut down by the
computers.  Engine 1's ignition was never started (due to the
shutdown order).  Thus, only one engine (Number 2) actually
fired this morning.