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To: Jim Parkinson who wrote (5344)	2/14/1999 11:28:00 PM
From: Valueman	Read Replies (1) \| Respond to of 10852

Proton/Telstar 6 launch events chart International Launch Services Release Event Time (h:mm:ss) Stage 1 ignition, 40% thrust -0:00:01.6 Begin stage 1 thrust to 100% 0:00:00 Liftoff 0:00:00.57 Stage 1 thrust to 100% 00:00:01 Maximum dynamic pressure 00:01:06 Stage 2 ignition 0:02:02 Stage 1/2 separation 0:02:06.7 Stage 3 vernier engine ignition 0:05:31.7 Stage 2 engine shutdown 0:05:34.4 Stage 2/3 separation 0:05:35.1 Stage 3 main engine ignition 0:05:40.5 Payload fairing jettison 0:05:44 Stage 3 main engine shutdown 0:09:38 Stage 3 vernier engine shutdown 0:09:49 Stage 3/Block DM upper stage separation 0:09:49.1 Block DM first burn ignition 1:14:19 Block DM first burn shutdown 1:20:52 Block DM second burn ignition 6:18:55 Block DM second burn shutdown 6:20:45 Block DM/Telstar 6 separation 6:40:32 International Launch Services Release Proton Ascent Profile The first three stages of the Proton will use a standard ascent trajectory to place the fourth stage, or Block DM, and Telstar 6 satellite into a 200 km (108 nautical miles) circular parking orbit inclined at 51.6 degrees as shown in Figure 2-1. Once Telstar 6 is in the parking orbit, it will be propelled to its transfer orbit by the Block DM. The six, stage one RD-253 engines are ignited at approximately T-1.6 seconds and are commanded to 40% of nominal thrust. Thrust is increased to 100% at T-0 seconds. Liftoff confirmation is signaled at T+0.57 seconds. The staged ignition sequence allows verification that all engines are functioning nominally before being committed to launch. The Proton executes a roll maneuver beginning at T+10 seconds to align the flight azimuth to the desired direction. The vehicle incurs its maximum dynamic pressure of 800 pounds per square foot at approximately 70 seconds into the flight. After the flight of the first stage, stage two's four RD-0210 engines begin their ignition sequence and are commanded to full thrust when stage one is jettisoned at 122.7 seconds. Stage three's vernier engines are ignited at 331.7 seconds followed by stage two shutdown at 334.4 seconds. Stage two separation occurs after six small, solid retro-fire motors are ignited at 333.4 seconds into flight. Stage three's single RD-0210 engine is ignited at 340.5 seconds and burns until shut down at 578 seconds. The four vernier engines burn for an additional 10 seconds and are shutdown at 577.1 seconds. After a five second coast, the stage three retro-fire motors are ignited and stage three is separated from the upper stage. Payload fairing jettison occurs during stage three flight at 344 seconds. The Block DM and Telstar 6 are delivered to the 200 km (108 nautical miles) circular parking orbit with a 51.6 degree inclination. Fifty five seconds after third stage separation, the Block DM releases its shrouds and executes a series of programmed turns, culminating in a maneuver to properly align its longitudinal axis for the first burn. After the alignment maneuver, the Block DM enters into a stabilized flight mode. Twenty five minutes after the longitudinal alignment maneuver, the Block DM executes a 180-degree turn about the roll axis to compensate for possible gyroscopic drift. Forty minutes after the roll maneuver, the Block DM reaches the first ascending node, and the two SOZ unit's axial loading engines begin a 300 second burn to settle the propellants. After the settling burn, the main engine ignites, raising the transfer orbit apogee to slightly above geosynchronous altitude. See Figures 2-2, 2-3. The first main engine burn lasts approximately 400 seconds. The Block DM then enters stabilized flight for approximately five hours in order to reach transfer orbit apogee. During this time, the Block DM executes maneuvers to meet Telstar 6 sun angle and thermal constraints. After reaching the transfer orbit apogee, the Block DM initiates another 300 second propellant settling burn followed by a main engine burn to raise perigee and reduce inclination. The Block DM then maneuvers to prepare for spacecraft separation. Separation occurs approximately six hours and 41 minutes after lift-off. After separation, Telstar 6 will perform a sereis of apogee burns that will raise its perigee and lower its inclination in order to arrive in geostationary orbit.