Space shuttle main engine meets test objectives



The second, full-duration test of the space shuttle's main propulsion system was conducted successfully on February 28, at the NASA test site in Mississippi. Officials responsible for shuttle propulsion system development said afterwards that all test objectives had been met during the 555-second firing.

Cited as noteworthy was the fact that the three main engines used in the test were successfully gimballed (steered) while they were being throttled back from 100% to 70% thrust, the first time that maneuver had been attempted.