STS-128 LAUNCH COUNTDOWN MILESTONES AND TIMES
(All times are Eastern)
Aug. 27, 2009
 
Launch Day (Friday, Aug. 28)

5:00 a.m. -- Crew sleep begins
12:00 p.m. -- Mission Management Team meets to discuss the results of the fill and drain valve testing, followed by the tanking meeting to give a “go/no go” for the fueling of Discovery
1:00 p.m. -- Crew wakeup for launch
1:30 p.m. -- Astronauts have breakfast
2:00 p.m. -- Astronauts get their final medical exams
2:30 p.m. -- NASA TV COVERAGE OF DISCOVERY’S FUELING BEGINS
2:34 p.m. -- Countdown resumes at the T-6 hour mark with the fueling of Discovery
3:19 p.m. -- LH sensors go to "wet" state
5:34 p.m. -- Countdown enters a 2 hour, 30 minute built-in hold at the T-3 hour mark; fueling enters stable replenish
6:00 p.m. -- Astronauts have a photo opportunity in crew quarters (not televised on NASA TV)
6:30 p.m. -- NASA TV COVERAGE BEGINS FOR DISCOVERY’S LAUNCH 7:29 p.m. -- Astronauts receive a weather briefing from the Ascent Team of flight controllers at Mission Control, Houston
7:39 p.m. -- Astronauts suit up for launch
8:04 p.m. -- Countdown resumes at the T-3 hour mark
8:09 p.m. -- Astronauts depart their crew quarters for the ride to Launch Pad 39A
8:39 p.m. -- Astronauts arrive at Launch Pad 39-A and begin to board Discovery
9:54 p.m. -- Discovery’s hatch is closed and latched for launch
10:44 p.m. -- Countdown enters a 10-minute built-in hold at the T-20 minute mark
10:54 p.m. -- Countdown resumes at the T-20 minute mark
11:05 p.m. -- Countdown enters a 40-minute built-in hold at the T-9 minute mark; the MMT conducts its final poll for a “go-no go” for the launch of Discovery (This hold will be adjusted by about 5 additional minutes to become a 45-minute built-in hold designed to meet the preferred in-plane launch time of 11:59:37pm EDT.)
11:50 p.m. -- Countdown resumes at the T-9 minute mark
11:54 p.m. -- APU start
11:59:37 p.m. -- LAUNCH OF DISCOVERY ON THE STS-128 MISSION