![]() ![]() Transatlantic Abort Landing (TAL) sites for the initial launch attempt were Zaragoza, Spain, Moron, Spain and Ben Guerir, Morocco. SSME #3 was shipped to the Stennis Space Center in Mississippi for test stand firing over the Labor day weekend (September 5, 1994). Three flight certified SSMEs (removed from the Atlantis STS-66 mission) were installed on the orbiter and Endeavour was rolled back to the launch pad on September 13, 1994. Afterwards, Endeavour's SSMEs were removed and inspected. A rollback of Endeavour to the VAB was done on August 24, 1994. The procedure that has been used on previous aborts treats an RSLS abort after SSME ignition as a launch and to require a complete engine reinspection. Ī new launch date was set for early October and then moved up to late September. This was the first flight for the HPOT on Main Engine (SSME) #3. Main Engine #3 (SN 2032) has been used on two previous flights with 2,412 seconds (40 min) of hot-fire time and a total of eight starts. This limit increases to 980 K at T−1.3 s (5.3 s after Main Engine Start). The redline limit to initiate a shutdown is at 867 K. The B channel indicated a redline condition while the other was near redline conditions. ![]() There are 2 sensor channels measuring temperature on the HPOT. The HPOT typically operates at 28,120 rpm and boosts the liquid oxygen pressure from 422 to 4,300 psi (2.91 to 29.6 MPa). ![]() The automatic abort was initiated by the onboard General Purpose Computers (GPC) when the discharge temperature on MPS Main Engine #3 High Pressure Oxidizer Turbopump (HPOT) exceeded its redline value. Previous aborts occurred on STS-41-D, STS-51-F, STS-55 and STS-51. The launch was originally scheduled August 18, 1994, but there was an RSLS abort at T-1.9 s after all three main engines ignited – the fifth (and final) time in the shuttle program where an RSLS abort occurred after main engine ignition. OMS-2 burn was 1 min 42 s (164 ft/s or 50 m/s) at MET 33 min. Main Engine Cutoff (MECO) was at an apogee of 115 nautical miles (213 km 132 mi) and a perigee of 28 nmi (52 km 32 mi) at MET of 8 min 35 s with Endeavour traveling at 25,779 ft/s (7,857 m/s). Payload liftoff mass 12,511 kilograms (27,582 lb). Orbiter mass at liftoff was 247,129 pounds (112,096 kg) including payload. The Launch window opened at 7:16 am EDT with a 2-hour-30-minute window. Launch September 30, 1994, at 7:16:00.068 am EDT from Kennedy Space Center Launch Pad 39-A. STS-68 was a human spaceflight mission using Space Shuttle Endeavour that launched from Kennedy Space Center, Florida on September 30, 1994. ![]()
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