Service Module Thruster Update

NASA Space Station On-Orbit Status 21 April 2006

“Update on SM thruster test: Yesterday’s test firing of the SM manifold #2 yaw thruster (-RZ) was executed as planned, and preliminary reports indicated that there were no issues. [This was a repeat of Part 1 of the thruster test attempted on 4/14 which was unsuccessful due to a procedural error.]”

NASA Space Station On-Orbit Status 20 April 2006

“ISS Reboost: The test of the SM main engines scheduled yesterday at 3:49pm EDT was aborted without engine ignition when the onboard software received no signal that the sun cover on engine #2 had opened. Attitude control was handed back to US without problems. TsUP/Moscow will not plan a retry until the data is fully analyzed and understood.”