alb@alice.UUCP (Adam L. Buchsbaum) (06/27/84)
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.