NTRS - NASA Technical Reports Server

Back to Results
SSME Key Operations DemonstrationA Space Shuttle Main Engine (SSME) test program was conducted between August 1995 and May 1996 using the Technology Test Bed (TTB) Engine. SSTO vehicle studies have indicated that increases in the propulsion system operating range can save significant weight and cost at the vehicle level. This test program demonstrated the ability of the SSME to accommodate a wide variation in safe operating ranges and therefore its applicability to the SSTO mission. A total of eight tests were completed with four at Marshall Space Flight Center's Advanced Engine Test Facility and four at the Stennis Space Center (SSC) A-2 attitude test stand. Key demonstration objectives were: 1) Mainstage operation at 5.4 to 6.9 mixture ratio; 2) Nominal engine start with significantly reduced engine inlet pressures of 50 psia LOX and 38 psia fuel; and 3) Low power level operation at 17%, 22%, 27%, 40%, 45%, and 50% of Rated Power Level. Use of the highly instrumented TTB engine for this test series has afforded the opportunity to study in great detail engine system operation not possible with a standard SSME and has significantly contributed to a greater understanding of the capabilities of the SSME and liquid rocket engines in general.
Document ID
Document Type
Contractor Report (CR)
Anderson, Brian (Boeing Defense and Space Group Canoga Park, CA United States)
Bradley, Michael (Boeing Defense and Space Group Canoga Park, CA United States)
Ives, Janet (Boeing Defense and Space Group Canoga Park, CA United States)
Date Acquired
September 6, 2013
Publication Date
July 7, 1997
Subject Category
Space Transportation
Report/Patent Number
AIAA Paper 97-2686
NAS 1.26:205358
Meeting Information
Joint Propulsion(Seattle, WA)
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 19970028376.pdf STI