1

13:10:39

TIG-5

APU 2 Start - Low Press

1

13:10:39

2

13:15:30

TIG

OMS TIG

2

13:15:30

3

13:18:08

OMS End of Burn

3

13:18:08

4

13:26:09

FRCS Dump Start

4

13:26:09

5

13:27:12

FRCS Dump Complete

5

13:27:12

6

4

13:31:25

EI-13

APU 1 Start - Low Press

6

13:31:25

7

5

13:31:29

APU 3 Start - Low Press

7

13:31:29

8

13:31:57

APU 1 Norm Press

8

13:31:57

9

13:31:59

APU 2 Norm Press

9

13:31:59

10

13:32:01

APU 3 Norm Press

10

13:32:01

11

13:32:29

SSME Engine Stow sequence start

Sequence was completed with closure of TVC Iso Vlv 1 at 13:33:30 GMT.

11

13:32:29

12

13:39:09

EI-5 (304 PRO)

Mach 24.40

V90Q8001C

12

13:39:09

V90Q8001C

nn

13

13:39:11

Speedbrake close & Rudder cmded to zero

13

13:39:11

14

6

13:44:09

EI

Entry Interface (400,000 Ft)

Mach 24.57

14

13:44:09

15

13:46:48

Qbar 0.5 psf

Mach 24.66

15

13:46:48

16

13:47:52

Qbar 2.0 psf

Elevon, BF active

Mach 24.66

16

13:47:52

17

deleted

17

deleted

17.5

13:49:07

ISELECT = 2

Closed-Loop Guidance

17.5

13:49:07

18

13:49:16

Qbar 10 psf

Roll Jets Deactivated

Mach 24.57

18

13:49:16

19

deleted

19

deleted

20

6.3

13:49:32

Initial Roll

Mach 24.51

V90H1044C

20

13:49:32

V90H1044C

nn

20.3

6.5

13:50:00 / 43

Five events of unexpected Return link comm drop-out.
Event 1 - 13:50:00 (1 sec); Event 2 - 13:50:04 / 06; Event 3 - 13:50:16/22: Event 4 - 13:50:25/28; Event 5 - 13:50:42 (1 sec)

On upper left aft antenna (TDRS 171/W). S-Band comm drop-outs considered out-of-family based on comparison with previous 102 flight data at 39 degrees, into KSC, descending node and similar look angles to TDRS.

20.3

13:50:00 / 43

20.5

13:50:30

1st Entry Heating Indication

Nominal Rise in Center Line Bond Temp (1) due to Entry Heating

Aft fuselage center bottom bond line

V09T1702A

20.5

13:50:30

V09T1702A

1140

-108

309

1

1.46

-75 / +300

21

7

13:50:53

Start of Peak Heating

Determined by analysis

Remote sensors indicate off-nominal external event - earliest known event

Note: L2L jet firing at 13:51:45.38 / 51.45.62. L3L jet firing at 13:51:45.36 / 41.45.60. R2R/R3R jet firings between 13:52:08 / 52:15 during data loss (firings determined by inj temp). R2R/R3R jet firings between 13:52:24 / 52:32 during data loss (firing determined by inj temps). (RCS data taken from Atlas analysis and plotted data).

21.5

13:51:19 / 13:52:49

22

7.35

13:51:46

Inertial sideslip angle (Beta) goes and stays Negative until LOS

While the magnitude of the observed Beta is not outside the flight history (41G & 42), the almost linear negative ramp prior to the first roll reversal is not consistent with other flights reviewed. This is consistent with a negative rolling and yawing torque on the vehicle.

V90H2249C

22

13:51:46

V90H2249C

nn

22.5

7.4

13:52:05

First clear indication of off-nominal aero increments

Delta yawing moment coefficient only (as compared to nominal aero). Derived by analysis.

22.5

13:52:05

22.6

7.45

13:52:09 / 15

Unexpected Return link comm drop-out (Event 6)

On upper left aft antenna (TDRS 171/W). S-Band comm drop-out considered out-of-family based on previous flt data (same remarks as seq # 20.3 above).

22.6

13:52:09 / 15

23

deleted

23

deleted

23.3

13:52:15

2nd Entry Heating Indication

Nominal Rise in Center Line Bond Temps (2) due to Entry Heating

Mid Fus Lower "Mid" Skin Temp
Mid Fus Bottom Center Bond Line Temp X1214

V34T1110A
V34T1112A

23.3

13:52:15

V34T1110A
V34T1112A

nn
nn

24

8

13:52:17

LMG Brake Line Temp D - On wheel well inbd sidewall (aft of sw vlvs) - Start of off nominal trend

Initiation of temp rise - off nominal based on rise rate comparison with flight experience.

V58T1703A

24

13:52:17

V58T1703A

1183

-108

312

1

1.46

-75/+300

24.3

7.45

13:52:25 / 31

Two events of unexpected Return link comm drop-out
Event 7 - 13:52:25/26; Event 8 - 13:52:29/31

On upper left aft antenna (TDRS 171/W). S-Band comm drop-out considered out-of-family based on previous flt data (same remarks as seq # 20.3 above).

24.3

13:52:25 / 31

24.5

deleted

24.5

deleted

24.7

deleted

24.7

deleted

24.8

8.5

13:52:32

Supply H2O dump Nozzle temps A/B show temporary increase in temp rise rate (15 second duration of high rise rate).

High rise rate is bounded by data loss. Increase in rise rate not observed on previous flights. GMT shown indicates start of initial rise duration. Reference event seq no. 26.6 for termination of event.

V62T0440A
V62T0439A

24.8

13:52:32

V62T0440A
V62T0439A

24.9

8.5

13:52:32

Vacuum vent temp shows temporary increase in temp rise rate (23 second duration of high rise rate).

High rise rate is bounded by data loss. Increase in rise rate not observed on previous flights. GMT shown indicates start of initial rise duration. Reference event seq no. 26.65 for termination of event.

V62T0551A

24.9

13:52:32

V62T0551A

25

8

13:52:41

LMG Brake Line Temp A - On strut facing MLG door - start of off nominal trend

Initiation of temp rise - off nominal based on rise rate comparison with flight experience.

V58T1700A

25

13:52:41

V58T1700A

1116

-140.4

282.8

1

1.46

-75/+300

25.5

deleted

25.5

deleted

26

8

13:52:41

Left Main Gear Brake Line Temp C - Start of off nominal trend

Unusual Temp Rise

V58T1702A

26

13:52:41

V58T1702A

1140

-108

309

1

1.46

-75/+300

26.5

deleted

26.5

deleted

26.6

8.5

13:52:47

Supply H2O dump Nozzle temps A/B return to typical rise rates.

High rise rate is bounded by data loss. GMT shown indicates end of initial rise duration. Temp took additional 48 seconds to return to nominal temp rise (53:35 GMT).

V62T0440A
V62T0439A

26.6

13:52:47

V62T0440A
V62T0439A

26.63

7.45

13:52:49 / 55

Unexpected Return link comm drop-out (Comm event 9)

On upper left aft antenna (TDRS 171/W). S-Band comm drop-out considered out-of-family based on previous flt data (same remarks as seq # 20.3 above).

26.63

13:52:49 / 55

26.65

8.5

13:52:55

Vacuum vent temp returns to typical rise rate.

High rise rate is bounded by data loss. GMT shown indicates end of initial rise duration. Temp took additional 40 seconds to returns to nominal temp rise (53:35 GMT).

V62T0551A

26.65

13:52:55

V62T0551A

26.7

13:52:56

Left INBD Elevon Lower Skin Temp - Start of off nominal trend

Temp trending down

V09T1006A

26.7

13:52:56

27

10

13:52:59

Left INBD Elevon Lower Skin Temp - OSL

V09T1006A

27

13:52:59

V09T1006A

nn

1

2.54

-200/+450

27.2

10.5

13:53:01

First clear indication of off-nominal rolling moment increment

Start of steady (-) growth in roll moment, derived by analysis

n/a

27.2

13:53:01

27.5

13:53:02

Hyd Syst 1LH INBD Elevon Actr Ret Ln Temp - start of off nominal trend
Hyd Syst 3 LOE Ret LN Temp - start of off nominal trend

Temp trending down

Temp trending down

V58T0157A

V58T0394A

27.5

13:53:02

V58T0157A

V58T0394A

1350

nn

-219

nn

118

nn

1

1

1.46

nn

-75/+300

nn

28

11

13:53:10

Hyd Syst 3 LOE Ret LN Temp - OSL

OSL was preceded by Nominal Temp rise

V58T0394A

28

13:53:10

V58T0394A

1368

-368

nn

1

1.46

-75/+300

29

11

13:53:11

Hyd Syst 1LH INBD Elevon Actr Ret Ln Temp - OSL

OSL was preceded by Nominal Temp rise

V58T0157A

29

13:53:11

V58T0157A

1350

-219

118

1

1.46

-75/+300

29.3

11.1

13:53:24

Alpha Modulation

Angle of attack modulation active

V90H0803C

29.3

13:53:24

V90H0803C

nn

29.5

11.2

13:53:26

Approx Veh Grd Location:
38.7 N / -123.5 W

Altitude 231600 ft / Mach 23.0 - Crossing the California Coastline

Data source: STS-107 GPS Trajectory Data

29.5

13:53:26

30

11

13:53:31 / 53:34

Hyd Syst 1 LOE Return Line Temp - OSL

OSL was preceded by Nom Temp rise plus data loss 3 sec's prior to event

V58T0193A

30

13:53:31 / 53:34

V58T0193A

1377

-367

436

1

1.46

-75/+300

30.2

11.3

13:53:32 / 34

Unexpected Return link comm drop-out (Comm event 10)

On upper left aft antenna (TDRS 171/W). S-Band comm drop-out considered out-of-family based on previous flt data (same remarks as seq # 20.3 above).

30.2

13:53:32 / 34

30.3

13:53:34 / 55:57

3rd Entry Heating Indication

Nominal Rise in Center Line Bond Temps (3) due to Entry Heating

13:53:34 - V09T1016A (Mid Fus Bot Port BL T X 620);
13:54:00 - V09T1022A (Mid Fus Bot Port BL T X 777);
13:55:57 - V09T1624A (Fwd Fus Lwr Skin Bot CL T)

V09T1016A

V09T1022A

V09T1624A

30.3

13:53:34 / 55:57

V09T1016A
V09T1022A
V09T1624A

nn
nn
nn

30.5

13:53:34

Hyd Sys 2 LIE Return Ln Temp - Start of Off Nominal Trend

Temp trending down

V58T0257A

30.5

13:53:34

V58T0257A

nn

31

11

13:53:36

Hyd Sys 2 LIE Return Ln Temp - OSL

V58T0257A

31

13:53:36

V58T0257A

1348

-219

116

1

1.46

-75/+300

31.5

deleted

31.5

deleted

31.7

deleted

31.7

deleted

32

deleted

32

deleted

32.1

11.5

13:53:44 / 48

Debris #1 - First report of debris observed leaving the Orbiter

Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

EOC2-4-0064
EOC2-4-0056

32.1

13:53:44 / 48

32.3

11.5

13:53:46 / 50

Debris #2 - Second report of debris observed leaving the Orbiter

Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

EOC2-4-0064
EOC2-4-0056

32.3

13:53:46 / 50

32.5

13:53:46

LMG Brake Line Temp A - On strut facing MLG door - Start of off nominal trend (temp rise rate change)

Temp rise rate change from 1.4 F/min to 5.5 F/min and increasing to LOS

V58T1700A

32.5

13:53:46

V58T1700A

1116

-140.4

282.8

1

1.46

-75/+300

32.7

11.5

13:53:54 / 58

Debris #3 - Third report of debris observed leaving the Orbiter. Event followed by momentary brightening of plasma trail.

Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

Debris:
EOC2-4-0056, 0026
Trail:
EOC2-4-0064, 0056

32.7

13:53:54 / 58

32.8

11.5

13:54:00 / 04

Debris #4 - Fourth report of debris observed leaving the Orbiter

Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

EOC2-4-0056
EOC2-4-0026

32.8

13:54:00 / 04

32.9

11.5

13:54:07 / 11

Debris #5 - Fifth report of debris observed leaving the Orbiter

Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

EOC2-4-0056
EOC2-4-0026

32.9

13:54:07 / 11

33

13

13:54:10

LMG Brake Line Temp B - Start of off nominal trend

Temp Increase

V58T1701A

33

13:54:10

V58T1701A

1116

-139.6

282.8

1

1.46

-75/+300

33.5

11.3

13:54:14 / 22

Unexpected Return link comm drop-out (Comm event 11)

On upper left aft antenna (TDRS 171/W). S-Band comm drop-out considered out-of-family based on previous flt data (same remarks as seq # 20.3 above).

33.5

13:54:14 / 22

34

14

13:54:20

Start of slow aileron trim change

GMT is approximate (13:54:20 +/- 10 seconds)

V90H1500C

34

13:54:20

V90H1500C

nn

34.5

14

13:54:20

Reversal in growth trend of derived roll moment coefficient

Observed moment changed from a negative slope to positive slope. Derived by analysis.

n/a

34.5

13:54:20

35

15

13:54:22

M-FUS LT BL Temp at x1215 - start of off nominal trend (increased rise rate)

Unusual Temp Rise (Rise rate higher than STS-109 & 87). Rise rate increased from 1 F/min (typical) to 7.6 F/min.

V34T1106A

35

13:54:22

V34T1106A

1215

nn

1

nn

35.2

15

13:54:22

LH Aft Fus Sidewall Temp at x1410 - start of off nominal trend (increased rise rate)

Unusual Temp Rise (Rise rate higher than STS-109 & 87). Rise rate increased from 2.7 F/min (typical) to 5.5 F/min.

V09T1724A

35.2

13:54:22

V09T1724A

1410

nn

35.5

13

13:54:24

Sys 3 Left Main Gear Strut Actuator Temp - start of off nominal trend

Unusual Temp Rise

V58T0405A

35.5

13:54:24

V58T0405A

1183

-115

315

1

1.46

-75/+300

35.7

13:54:25

Approx Veh Grd Location:
38.3 N / -119.0 W

Altitude 227400 ft / Mach 22.5 - Crossing the California / Nevada State Line

Data source: STS-107 GPS Trajectory Data

35.7

13:54:25

35.8

13:54:26

S-Band switched from upper left aft antenna to upper right aft antenna

TDRS 171/W

35.8

13:54:26

36

deleted

36

deleted

36.5

15.3

13:54:33.3 / 33.9

Flash #1 - Orbiter envelope suddenly brightened (duration 0.3 sec), leaving noticeably luminescent signature in plasma trail

Note: R3R and R2R 0.24 sec jet firings occurred at 13:54:33.52 / 33.76 and 13:54:33.54 / 33.78 respectively (ref: RCS Atlas analysis and plots).

EOC2-4-0026
EOC2-4-0034
EOC2-4-0009B

36.5

13:54:33.3 / 33.9

36.6

15.3

13:54:35 / 37

Debris #6 - Very bright debris seen leaving the Orbiter

Seen just aft of Orbiter envelope. Also, reference RCS jet firing note in item # 36.5 above. Debris events 6 and 14 are visually the biggest, brightest events and therefore may indicate the most significant changes to the Orbiter of the western debris events.

EOC2-4-0026
EOC2-4-0009B
EOC2-4-0030

36.6

13:54:35 / 37

37

deleted

37

deleted

37.5

deleted

37.5

deleted

37.7

13:54:53

MLG LH Outbd Wheel Temp - start of off nominal trend

2 bit flips up (ref #56.5 when temp starts to trend down)

V51T0574A

37.7

13:54:53

V51T0574A

1074

-115

nn

1

0.98

-75/+300

37.75

15.35

13:55:04 / 10

Debris #7 - Seventh report of debris observed leaving the Orbiter

Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

EOC2-4-0030

37.75

13:55:04 / 10

37.8

13

13:55:12

Sys 3 LMG Brake Sw Vlv Ret Line Temp (FWD) - start of off nominal trend

Temp Increase

V58T0842A

37.8

13:55:12

V58T0842A

1156

-110

314

1

1.46

-75/+300

38

deleted

38

deleted

39

deleted

39

deleted

40

13:55:21

Drag 11 fps2

Drag Measurement Incorporation

Mach 21.nn

40

13:55:21

40.1

15.35

13:55:21 / 27

Debris #8 - Eighth report of debris observed leaving the Orbiter. Event was followed by momentary brightening of plasma trail.

Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

Debris: EOC2-4-0030; trail: EOC2-4-0005, 0017, 0021, 0028, and 0030

40.1

13:55:21 / 27

40.2

15.35

13:55:25 / 29

Debris #9 - Ninth report of debris observed leaving the Orbiter. Event was followed by multiple secondary plasma trails.

Seen just aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

EOC2-4-0030, 0050

40.2

13:55:25 / 29

40.3

15.35

13:55:26 / 30

Debris #10 - Tenth report of debris observed leaving the Orbiter

Seen well aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

EOC2-4-0005

40.3

13:55:26 / 30

40.4

15.4

13:55:30

Remote sensors indicate off-nominal external event

GMT is approximate. Preliminary match to debris shedding seen in video from Ivins, UT (Debris #10). Strong confidence that this is an off-nominal event. No evidence of RCS jet firings (ref Atlas data and plots).

40.4

13:55:30

40.5

13:55:32

Approx Veh Grd Location:
37.4 N / -114.1 W

Altitude 223400 ft / Mach 21.8 - Crossing the Nevada / Utah State Line

Data source: STS-107 GPS Trajectory Data

40.5

13:55:32

40.6

13:55:33 / 35

Return link comm drop-out (Comm event 12)

First comm drop out after switched to upper right aft antenna (TDRS 171/W). While uncommon to have a drop out at this point, inconclusive if drop-out is off-nominal based on previous flt data.

40.6

13:55:33 / 35

41

deleted

41

deleted

41.5

15.45

13:55:36 / 42

Debris #11 - Eleventh report of debris observed leaving the Orbiter

Seen well aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

EOC2-4-0050

41.5

13:55:36 / 42

42

15.5

13:55:41

Mid Fus Port (Left) Sill Longn Temp at x1215 - start of off nominal trend

Unusually high temp rise with respect to STS-87 & 109. Went to 2.6 F/min from 0 F/min.

V34T1118A

42

13:55:41

V34T1118A

nn

42.3

15.45

13:55:45 / 49

Debris #12 - Twelfth report of debris observed leaving the Orbiter. Event was preceded and followed by secondary plasma trails.

Seen aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

EOC2-4-0028, 0050

42.3

13:55:45 / 49

42.5

13:55:55

Approx Veh Grd Location:
37.0 N / -112.4 W

Altitude 222100 ft / Mach 21.5 - Crossing the Utah / Arizona State Line

Data source: STS-107 GPS Trajectory Data

42.5

13:55:55

42.7

15.45

13:55:55 / 59

Debris #13 - Thirteenth report of debris observed leaving the Orbiter. Event was followed by momentary brightening of plasma trail adjacent to debris.

Seen well aft of Orbiter envelope. No evidence of RCS jet firings (ref Atlas data and plots).

EOC2-4-0005, 0017, 0021

42.7

13:55:55 / 59

42.8

15.45

13:55:58 / 56:00

Debris #14 - Very bright debris observed leaving the Orbiter.

Seen just aft of Orbiter envelope. Debris events 6 and 14 are visually the biggest, brightest events and therefore may indicate the most significant changes to the Orbiter of the western debris events.- No evidence of RCS jet firings (ref Atlas data and plots).

EOC2-4-0005, 0017, 0021, 0028, 0030

42.8

13:55:58 / 56:00

42.9

13:56:00 / 03

Return link comm drop-out (Comm event 13)

On upper right aft antenna (TDRS 171/W). While uncommon to have a drop out at this point, inconclusive if drop-out is off-nominal based on previous flt data.

42.9

13:56:00 / 03

43

13:56:02

Qbar 40 psf

Aft RCS Pitch Jets Deactivated

43

13:56:02

44

16

13:56:03

Left Lower Wing Skin Temp - start of off nominal trend

Temp reading trending down (potential sensor/wire damage)

V09T1002A

44

13:56:03

V09T1002A

1280.1

240

LWR

1

2.54

-200/+450

44.2

15.45

13:56:09 / 13

Debris #15 - Fifteenth report of debris observed leaving the Orbiter.

Seen just aft of Orbiter envelope. Nearest jet firings: R2R jet firing at 032:13:56:17.30 / 56:17.54 for 0.24 seconds, & R3R jet firing at 032:13:56:17.28 / 56:17.52 for 0.24 seconds. (Ref: RCS Atlas data analysis and plots).

EOC2-4-0017

44.2

13:56:09 / 13

44.5

16.5

13:56:16

Hyd Sys 1 LMG UpLK Actr Unlk Ln Temp - Temp rise rate change

Temp rise rate change from 0.7 F/min (nominal) to 3.9F/min and increasing to LOS

V58T0125A

44.5

13:56:16

V58T0125A

1159

-124

315

1

1.46

-75/+300

44.6

16.5

13:56:17

Sys 3 LMG Brake Sw Vlv Ret Line Temp (FWD) - Temp rise rate change

Temp rise rate change from 1.5 F/min to 8.8 F/min (stayed at this rate to LOS)

V58T0842A

44.6

13:56:17

V58T0842A

1156

-110

314

1

1.46

-75/+300

44.7

16.5

13:56:20

LMG Brake Line Temp C - Temp rise rate change

Temp rise rate change from 1.3 F/min to 9.9 F/min (stayed at this rate to LOS)

V58T1702A

44.7

13:56:20

V58T1702A

1140

-108

309

1

1.46

-75/+300

44.8

16.5

13:56:22

LMG Brake Line Temp B - Temp rise rate change

Temp rise rate change from 2.1 F/min to 9.1 F/min increasing to LOS

V58T1701A

44.8

13:56:22

V58T1701A

1116

-139.6

282.8

1

1.46

-75/+300

45

16

13:56:24

Left Upper Wing Skin Temp - start of off nominal trend

Temp reading trending down (potential sensor/wire damage)

V09T1024A

45

13:56:24

V09T1024A

1280.1

240

UPR

1

2.54

-200/+450

46

16.55

13:56:30

1st Roll Reversal Initiation

Mach 21.13

V90H1044C

46

13:56:30

V90H1044C

nn

46.5

13:56:45

Approx Veh Grd Location:
36.1 N / -109.0 W

Altitude 219000 ft / Mach 20.9 - Crossing the Arizona / New Mexico State Line

Data source: STS-107 GPS Trajectory Data

46.5

13:56:45

46.7

16.5

13:56:53

Sys 3 Left Main Gear Strut Actuator Temp - Temp rise rate change

Temp rise rate change from 1.7 F/min to 12.9 F/min (stayed at this rate to LOS)

V58T0405A

46.7

13:56:53

V58T0405A

1183

-115

315

1

1.46

-75/+300

47

16.55

13:56:55

Roll Reversal #1

1st Roll Reversal Complete

Mach 20.76

V90H1044C

47

13:56:55

V90H1044C

nn

47.5

13:56:55 / 57

Return link comm drop-out (Comm event 14)

On upper right aft antenna (TDRS 171/W). While uncommon to have a drop out at this point, inconclusive if drop-out is off-nominal based on previous flt data.

47.5

13:56:55 / 57

Note: No further comm drop-out events are listed in the timeline thru LOS, since they are not considered out-of-family at this time.

48

13:56:58

IMU Velocity Increase

Reflects accelerations imparted during roll reversal. Same signature observed on STS-109. Nominal event.

48

13:56:58

49

13:57:nn

Bodyflap deflection up 3 degrees

Matches nominal aero simulation

V90H6410C

49

13:57:nn

V57HxxxxC

nn

49.5

deleted

49.5

deleted

49.55

16.8

13:57:19 / 29

Debris # 16 - Very faint debris observed leaving just aft of Orbiter (occurred over NM)

Observations by personnel from the Starfire Optical Range (Kirtland Air Force Base, NM).
Note: nearest jet firings: L2L jet firing at 032:13:56:54.71 / 57:01.12 & 032:13:57:46.35 / 57:53.12 & L3L jet firing at 032:13:56:54.66 / 57:01.07 & 032:13:57:46.33 / 57:53.10 (all 4 occurred during data dropouts & were determined based on injector temps alone). Also, R2R at 032:13:57:43.94 / 57:44.42 & R3R at 032:13:57:43.92 / 57:44.40 for 0.48 secs ea. (Ref Atlas data analysis and plots.)

EOC2-4-0148-2

49.55

13:57:19 / 29

49.6

16.9

13:57:19

MLG LH Outbd Tire Pressure 1 - start of off nominal trend

Bit flip up - off nominal thru comparison with previous flights

V51P0570A

49.6

13:57:19

V51P0570A

1074

-160

nn

1

0.67

230 / 401

49.7

16.9

13:57:24

MLG LH Outbd Tire Pressure 2 - start of off nominal trend

Bit flip up - off nominal thru comparison with previous flights

V51P0572A

49.7

13:57:24

V51P0572A

1074

-160

nn

1

0.67

230 / 401

50

17

13:57:28

Left Lower Wing Skin Temp - OSL

V09T1002A

50

13:57:28

V09T1002A

1280.1

240

LWR

1

2.54

-200/+450

51

deleted

Rationale for deletion: Originally indicated as "Start of Roll trim in elevons". Inserted independently early in the investigation, but is better defined by sequence no. 54. "Roll trim" is better indicated with aileron trim.

51

deleted

52

17

13:57:43

Left Upper Wing Skin Temp - OSL

V09T1024A

52

13:57:43

V09T1024A

1280.1

240

UPR

1

2.54

-200/+450

53

19

13:57:54

Sys 2 LH Brake Switching Vlv Return Temp (AFT) - start of off nominal trend

Temp increase

V58T0841A

53

13:57:54

V58T0841A

1173

-107

313

1

1.46

-75/+300

53.5

16.8

13:57:53.7 / 55.7

Flare 1: Asymmetrical brightening of Orbiter shape observed (occurred over NM)

Observations by personnel from the Starfire Optical Range (Kirtland Air Force Base, NM).
Note: nearest jet firings: Same as seq no. 49.55 plus L2L at 032:13:58:00.50 / 01.46 & L3L at 032:13:58:00.48 / 01.44 (in both cases there was no start up data, but good tail off/shutdown) - 0.96 sec pulse each. Also, R2R at 032:13:58:03.18 / 09.16 & R3R at 032:13:58:03.18 / 09.16 - (in both cases firings occurred during data dropouts and were determined by injector temps). (Ref Atlas analysis and plots.)

EOC2-4-0148-4

53.5

13:57:53.7 / 55.7

53.7

16.8

13:57:59.5 / 58:01.5

Flare 2: Asymmetrical brightening of Orbiter shape observed (occurred over NM)

Observations by personnel from the Starfire Optical Range (Kirtland Air Force Base, NM).
Note: same jet firing information as for event seq no.s 49.55 & 53.5. (Ref Atlas analysis and plots.)

EOC2-4-0148-4

53.7

13:57:59.5 / 58:01.5

54

20

13:58:03

Start of "sharp" aileron trim increase

Mach 19.79; GMT is approximate (13:58:03+/-10 seconds)

V90H1500C

54

13:58:03

V90H1500C

nn

54.3

20.5

13:58:09

Increase in derived rolling and yawing moment increments

Sustantial increase in observed growth rate of both roll and yaw moment increments. Derived by analysis.

n/a

54.3

13:58:09

54.5

22.5

13:58:16

LMG Brake Line Temp D - Temp rise rate change

Temp rise rate change from 0.9 F/min to 11.7 F/min (stayed at this rate to LOS)

V58T1703A

54.5

13:58:16

V58T1703A

1183

-108

312

1

1.46

-75/+300

55

deleted

55

deleted

55.5

13:58:20

Approx Veh Grd Location:
34.2 N / -103.1 W

Altitude 209800 ft / Mach 19.5 - Crossing the New Mexico / Texas State Line

Data source: STS-107 GPS Trajectory Data

55.5

13:58:20

56

deleted

56

deleted

57

23

13:58:32

MLG LH Outbd Tire Pressure 1 - pressure trending down (to OSL)

Trending to OSL following 7 sec LOS (initiation time not exact) - ref #60

V51P0570A

57

13:58:32

V51P0570A

1074

-160

nn

1

0.67

230 / 401

58

23

13:58:32

MLG LH Inbd Tire Pressure 1 - pressure trending down (to OSL)

Trending to OSL following 7 sec LOS (initiation time not exact) - ref #64

V51P0571A

58

13:58:32

V51P0571A

1074

-115

nn

1

0.67

230 / 401

58.5

13:58:32