STS-99 Mission Report
STS-99 ascent events summary

Posted: Jan. 31, 2000

T+0:00 Liftoff
The twin solid rocket boosters are ignited and space shuttle Endeavour launches from pad 39A at Kennedy Space Center, Florida.
T+0:10 Start roll maneuver
Endeavour beings a roll program to achieve a northeasterly track from KSC, heading toward a 57 degree inclination to the equator.
T+0:18 End roll
The shuttle completes the programmed roll maneuver and is now positioned heads down, wings level.
T+0:36 Start throttle down
The three liquid-fueled main engines are throttled down to 72 percent rated thrust to ease the vehicle's flight through the dense lower atmosphere.
T+0:50 Throttle up
Endeavour's main engines begin throttling back up. The engines's thrust level will be taken to 104.5 percent.
T+2:05 SRB staging
Having consumed all their propellant, the solid rocket boosters are jettisoned from the attachment points on the external fuel tank. The boosters parachute into the Atlantic Ocean for recovery and reuse.
T+2:13 Start OMS assist
The twin Orbital Maneuvering System engines on the tail of Endeavour are ignited to begin a one-minute, 42-second firing to assist the shuttle into space.
T+3:52 Negative return
Endeavour can no longer make an emergency Return-to-Launch-Site abort landing at Kennedy Space Center. A problem after this point in flight requiring an abort would lead to a Trans-Atlantic Abort Landing, an Abort-Once-Around or Abort-to-Orbit.
T+5:47 Rolls to heads up
A programmed maneuver rolls Endeavour to a heads up position, placing the shuttle atop the external tank. This is done to improve communications between the shuttle and orbiting NASA satellites.
T+8:24 MECO command
Endeavour's three main engines are shut down. The external fuel tank is jettisoned moments later. The shuttle should have achieved an orbit with a high point of 122 nautical miles and low point of 23 nautical miles, inclinated 57.0 degrees. An upcoming firing of the OMS engines will circularize the orbit.

Data source: NASA.
Flight data file
Vehicle: Endeavour (OV-105)
Payload: SRTM
Launch date: Feb. 11, 2000
Launch window: 1730-1940 GMT (12:30-2:40 p.m. EST)
Launch site: LC-39A, Kennedy Space Center, Fla.
Landing date: Feb. 22, 2000
Landing time: 2138 GMT (4:38 p.m. EST)
Landing site: SLF, KSC
Crew: Kregel, Gorie, Kavandi, Voss, Mohri, Thiele

Pre-launch Briefing
Mission Overview - Complete report on Endeavour mission, payload and astronauts.

Launch Windows - Chart of available launch windows for Endeavour during the next several days.

STS-99 Index - Directory of our STS-99 mission coverage.

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