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Atlas/TDRS L launch timeline
Posted: January 21, 2014

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T-0:00:02.7 Engine Start
The Russian-designed RD-180 main engine is ignited and undergoes checkout prior to launch.
T+0:00:01.1 Liftoff
The Atlas 5 vehicle, designated AV-043, lifts off and begins a vertical rise away from Complex 41 at Cape Canaveral Air Force Station, Florida.
T+0:01:31 MaxQ
The rocket passes through the area of maximum aerodynamic pressure as it accelerates through the lower atmosphere.
T+0:04:02 Main Engine Cutoff
The RD-180 main engine completes its firing after consuming its kerosene and liquid oxygen fuel supply in the Atlas first stage.
T+0:04:08 Stage Separation
The Common Core Booster first stage of the Atlas 5 rocket separates from the Centaur upper stage. Over the next few seconds, the Centaur engine liquid hydrogen and liquid oxygen systems are readied for ignition.
T+0:04:18 Centaur Ignition 1
The Centaur RL10 engine ignites for the longer of the two upper stage firings. This burn will inject the Centaur stage and TDRS spacecraft into a parking orbit.
T+0:04:26 Nose Cone Jettison
The payload fairing that protected the TDRS L spacecraft during the climb through the atmosphere is no longer needed and is separated.
T+0:18:13 Centaur Cutoff 1
The Centaur engine shuts down after arriving in a planned parking orbit. The vehicle enters a lengthy coast period lasting nearly 80 minutes before arriving at the required location in space for the second burn.
T+1:40:07 Centaur Ignition 2
The Centaur re-ignites to propel the payload into geosynchronous transfer orbit from the parking achieved earlier in the launch sequence.
T+1:41:10 Centaur Cutoff 2
At the conclusion of its second firing, the Centaur will have delivered the TDRS L spacecraft into the targeted orbit with an apogee of 22,238 statute miles, perigee of 3,007 statute miles and inclination of 25.5 degrees.
T+1:45:56 Spacecraft Separation
NASA's second spacecraft in its third-generation Tracking and Data Relay Satellite System is released into orbit from the Centaur upper stage to complete the AV-043 launch.

Data source: United Launch Alliance