1
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do you - 15 seconds and the sound

2
00:00:07,430 --> 00:00:03,990
suppression water system has been

3
00:00:16,939 --> 00:00:07,440
activated we have a go for main can

4
00:00:20,470 --> 00:00:16,949
start three two one zero booster

5
00:00:22,910 --> 00:00:20,480
ignition and liftoff of discovery

6
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blazing a trail to scientific

7
00:00:33,680 --> 00:00:39,200
roll discovery

8
00:00:45,459 --> 00:00:40,850
down position putting it on course for

9
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and eventually the International Space

10
00:01:01,950 --> 00:01:00,210
Discovery's 3 main engines are now

11
00:01:03,510 --> 00:01:01,960
throttling down to reduce stress on the

12
00:01:06,570 --> 00:01:03,520
shuttle as it travels through the area

13
00:01:09,540 --> 00:01:06,580
of maximum dynamic pressure discovery is

14
00:01:15,990 --> 00:01:09,550
already at an altitude of 4.7 miles or

15
00:01:24,540 --> 00:01:16,000
20 6,500 feet traveling discovery go at

16
00:01:26,100 --> 00:01:24,550
throttle up traveling 1,000 miles per

17
00:01:27,690 --> 00:01:26,110
hour Discovery's engines are now

18
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throttled back up and performing at full

19
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capability at the top shuttle weighed

20
00:01:46,410 --> 00:01:42,729
more than four and a half million pounds

21
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and now one minute and 27 seconds into

22
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the flight the main engines and solid

23
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rocket boosters have reduced that weight

24
00:01:54,300 --> 00:01:51,910
by about half solid rocket rocket

25
00:01:56,340 --> 00:01:54,310
boosters alone or burning burning 11,000

26
00:01:58,350 --> 00:01:56,350
pounds of propellant per second and the

27
00:02:04,080 --> 00:01:58,360
external tank is now 3,000 pounds

28
00:02:06,960 --> 00:02:04,090
lighter than when it began Discovery's

29
00:02:11,070 --> 00:02:06,970
now 21 miles away from its launch pad

30
00:02:13,050 --> 00:02:11,080
and 22 miles in altitude traveling 2,700

31
00:02:15,330 --> 00:02:13,060
miles per hour all three main engines

32
00:02:16,830 --> 00:02:15,340
are working just as expected the three

33
00:02:19,020 --> 00:02:16,840
fuel cells are generating power and

34
00:02:21,000 --> 00:02:19,030
three auxiliary power units are all

35
00:02:24,900 --> 00:02:21,010
producing pressure in short everything

36
00:02:32,550 --> 00:02:24,910
performing well two minutes and seven

37
00:02:33,870 --> 00:02:32,560
seconds into the sts-131 mission the

38
00:02:35,460 --> 00:02:33,880
booster officer in the Mission Control

39
00:02:36,750 --> 00:02:35,470
Center has confirmed solid rocket

40
00:02:39,180 --> 00:02:36,760
booster separation