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RS-25 preparing for another hot fire as SLS flight engines line up for EM-1

25 Jul 2017, 13:13 UTC
RS-25 preparing for another hot fire as SLS flight engines line up for EM-1
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The RS-25 engine team is counting down to the next engine controller unit (ECU) hot-fire acceptance test on Tuesday in the A-1 test stand at the Stennis Space Center in Mississippi. NASA, RS-25 prime contractor Aerojet Rocketdyne, and Stennis facilities contractor Syncom Space Services (S3) will perform a flight-duration test firing of Development Engine 0528 (E0528) with the third of four ECUs that are planned to fly on the first launch of NASA’s Space Launch System (SLS) launch vehicle.

RS-25 Test:
The latest Honeywell controller was installed on the test engine earlier this month as NASA looks to complete work to deliver the flight engines for the Exploration Mission-1 (EM-1) launch.
Philip Benefield, Systems and Requirements Team Lead for the SLS Liquid Engines Office, said in an email that the primary objective for this test is to acceptance test (or “green run”) the FM5 flight model ECU. Each engine has a dedicated, self-redundant controller unit that controls its operation, monitors its health, and communicates with the launch vehicle flight computers.
Tuesday’s test is the third in a string of engine controller green run tests that began earlier this year. The FM2 and FM3 ECUs were green run on E0528 during ...

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