|The Delta 2 rocket's main engine and twin vernier steering thrusters are started moments before launch. The six ground-start strap-on solid rocket motors are ignited at T-0 to begin the mission.
|Ground-Lit SRM Burnout
|The six ground-start Alliant TechSystems-built solid rocket motors consume all their propellant and burn out.
|Air-Lit SRM Ignition
|The three remaining Alliant TechSystems-built solid rocket motors strapped to the Delta 2 rocket's first stage are ignited.
|Jettison Ground-Lit SRMs
|The six spent ground-started solid rocket boosters are jettisoned in sets of three at T+66 and T+67 seconds to fall into the Atlantic Ocean.
|Jettison Air-Lit SRMs
|Having burned out, the three spent air-started solid rocket boosters are jettisoned toward the Atlantic Ocean.
|Main Engine Cutoff
|After consuming its RP-1 fuel and liquid oxygen, the Rocketdyne RS-27A first stage main engine is shut down. The vernier engines cut off moments later.
|The Delta rocket's first stage is separated now, having completed its job. The spent stage will fall into the Atlantic Ocean.
|Second Stage Ignition
|With the stage jettisoned, the rocket's second stage takes over. The Aerojet AJ118-K liquid-fueled engine ignites for the first of two firings needed to place the upper stage and GPS 2R-6 satellite into the proper orbit.
|Jettison Payload Fairing
|The 9.5-foot diameter composite payload fairing that protected the GPS 2R-6 satellite atop the Delta 2 during the atmospheric ascent is jettisoned is two halves.
|Second Stage Cutoff 1
|The second stage engine shuts down to complete its first firing of the launch. The rocket and attached GPS 2R-6 spacecraft are now in a 9-minute coast period before the second stage reignites.
|Second Stage Restart
|Delta's second stage engine reignites for a short firing to continue the journey to space.
|Second Stage Cutoff 2
|The second stage shuts down after a 35-second burst. Over the next minute, tiny thrusters on the side of the rocket will be fired to spin up the vehicle in preparation for stage separation.
|The liquid-fueled second stage is jettisoned from the rest of the Delta 2 rocket having completed its role in the launch.
|Third Stage Ignition
|The Thiokol Star 48B solid-fueled third stage is then ignited to complete GPS 2R-6's delivery into its intended orbit around Earth.
|Third Stage Burnout
|Having used up all its solid-propellant, the third stage burns out to completed the powered phase of the launch sequence. Over the next two minutes, two small yo-yo-like structures are released from the third stage to reduce the spinning motion the Delta rocket and GPS 2R-6 are experiencing in preparation for satellite separation.
|GPS 2R-5 Separation
|The U.S. Air Force's NAVSTAR Global Positioning System Block 2R-6 spacecraft is released into space. The Delta should have placed the satellite into a transfer orbit with a high point of 10,998 nautical miles and low point of 101 nautical mile. The satellite will circularize its orbit.