Integ Time Line Team - REV 15 BASELINE 3/10/2003 8 PM Integ Time Line Team - REV 15 BASELINE 3/10/2003 8 PM
Note: Rev 15 BASELINE corrects typo's, adds S-Band comm drop out data, & adds new debris observations & jet firings nearest the debris observations. Note: Rev 15 BASELINE corrects typo's, adds S-Band comm drop out data, & adds new debris observations & jet firings nearest the debris observations.
Rev 15 was been baselined by the OVE Working Group Team as of 3/10/03. Rev 15 was been baselined by the OVE Working Group Team as of 3/10/03.
          Measurement      
Seq Sum GMT Milestone Entry Event Remarks MSID / ID Seq GMT MSID Heater Bk   Location ID   Sample Rate Bit Value Range Temp Rise Rates / Additional Comments
No. No. GMT Day 32         No. GMT Day 32   ID X Y Z Hz (R/256)    
1 1 13:10:39 TIG-5 APU 2 Start - Low Press     1 13:10:39                  
                                   
2 2 13:15:30 TIG OMS TIG     2 13:15:30                  
3 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 nn nn nn nn 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 nn nn nn nn 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   21 13:50:53                  
21.5 7.3 13:51:19 / 13:52:49   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 nn nn nn nn 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
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23.5 7.5 13:52:17
Approx Vehicle Ground Location:
39.0 N / -129.2 W
Altitude 236,800 ft / Mach 23.6 - Over the Pacific Ocean, approx 300 miles West of California Coastline Approx vehicle position when first off-nominal data was seen; Data source: STS-107 GPS Trajectory Data   23.5 13:52:17
                 
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 nn 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 nn nn nn nn 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
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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 nn nn nn nn 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 nn nn nn nn 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 nn 1 nn 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 nn nn nn 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 nn nn nn nn 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 nn nn nn nn 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 nn nn nn nn 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 nn nn nn nn 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 nn nn nn nn 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   MLG LH Outbd Wheel Temp - temperature trending down (to OSL) Trending to OSL following 7 sec LOS (initiation time not exact) - ref #62 V51T0574A 58.5 13:58:32 V51T0574A   1074 -160 nn 1 0.67 230 / 401  
58.7   13:58:32 / 59:22   Sys 2 LH Brake Switching Vlv Return Temp (AFT) - temp rise rate change Temp rise rate change from 2.5 F/min to 40.0 F/min until 13:59:22 (temp peak) - ref #70.5 V58T0841A 58.7 13:58:32 / 59:22 V58T0841A                
59   13:58:36   MLG LH Inbd Wheel Temp - start of temperature trending down (to OSL) Start of trend to OSL - ref #66 V51T0575A 59 13:58:36 V51T0575A   1074 -115 nn 1 0.98 -75 / +175  
60 23 13:58:38   MLG LH Outbd Tire Pressure 1 - OSL   V51P0570A 60 13:58:38 V51P0570A   1074 -160 nn 1 0.67 230 / 401  
                                   
61   deleted     Rationale for deletion: Moved to seq no. 63.5 after further data review.   61 deleted                  
                                   
62 25 13:58:39   MLG LH Outbd Wheel Temp - OSL   V51T0574A 62 13:58:39 V51T0574A   1074 -115 nn 1 0.98 -75 / +175  
63 23 13:58:39   MLG LH Outbd Tire Pressure 2 - start of pressure trending down (to OSL) Start of trend to OSL - ref #68 V51P0572A 63 13:58:39 V51P0572A   1074 -160 nn 1 0.67 230 / 401  
63.5 25.5 13:58:40   BFS Fault Msg (4) - Tire Pressures - First Message 32/13:58:39.94 - SM0 Tire P LOB
32/13:58:41.84 - SM0 Tire P LIB
32/13:58:49.54 - SM0 Tire P LIB
32/13:58:56.26 - SM0 Tire P LOB
  63.5 13:58:40                  
64 23 13:58:40   MLG LH Inbd Tire Pressure 1 - OSL   V51P0571A 64 13:58:40 V51P0571A   1074 -115 nn 1 0.67 230 / 401  
65   13:58:41   MLG LH Inbd Tire Pressure 2 - start of off nominal trend Press rose ~3.5 psia in 2 sec's V51P0573A 65 13:58:41 V51P0573A   nn nn nn 1 0.67 230 / 401  
65.5 23 13:58:43   MLG LH Inbd Tire Pressure 2 - start of pressure trending down   V51P0573A 65.5 13:58:43 V51P0573A   nn nn nn   0.67 230 / 401  
66 25 13:58:48   MLG LH Inbd Wheel Temp - OSL   V51T0575A 66 13:58:48 V51T0575A   nn nn nn 1 0.67 230 / 401  
67 23 13:58:48   MLG Inbd Tire Pressure 2 - OSL   V51P0573A 67 13:58:48 V51P0573A   nn nn nn 1 0.67 230 / 401  
68 23 13:58:54   MLG LH Outbd Tire Pressure 2 - OSL   V51P0572A 68 13:58:54 V51P0572A   1074 -160 nn 1 0.67 230 / 401  
                                   
69 26 13:58:56   BFS Fault Msg (4) - Tire Pressures - Last Message     69 13:58:56                  
                                   
70 27 13:59:06   Left Main Gear Downlocked Indication - Transferred ON Uplock indicated no change V51X0125E 70 13:59:06 V51X0125E   1189 -135 nn 1 n/a 0 / 1  
70.3 27.5 13:59:23   Loss of MCC real-time data to the workstations in the FCR and MER     70.3 13:59:23                  
70.5   13:59:22   Sys 2 LH Brake Switching Vlv Return Temp (AFT) - start of sharp downward temperature trend Temp trending down until loss of signal - ref #81 V58T0841A 70.5 13:59:22 V58T0841A   1173 -107 313 1 1.46 -75/+300  
71 28 13:59:30.66   Start of R2R yaw firing Last pulse before LOS (stayed on to end of first 5-sec period of recon data at 032/13:59:37.4 GMT) V79X2634X 71 13:59:30.66 V79X2634X   nn nn nn nn n/a 0 / 1  
72 28 13:59:30.68   Start of R3R yaw firing Last pulse before LOS (stayed on to end of first 5-sec period of recon data at 032/13:59:37.4 GMT) V79X2638X 72 13:59:30.68 V79X2638X   nn nn nn nn n/a 0 / 1  
73 29 13:59:31   Observed elevons deflection at LOS Left: -8.11 deg (up); Right: -1.15 deg (up) V90H7505C
V90H7555C
73 13:59:31                  
73.1 29.3 13:59:31.400   FCS Channel 4 Aerosurface position measurements start trending towards their null values Indicates worsening failure of transducer excitation via a wiring short conditions V57H0253A
(5 Hz)
73.1 13:59:31.400                  
73.2 29.3 13:59:31.478   All FCS Channel 4 Bypass valves close (indicating bypassed) Leading indicator of ASA fail (high-rate data) V58P0915A 73.2 13:59:31.478                  
73.3 29.3 13:59:31.7   Speedbrake channel 4 OI position measurement indicated successively 19, 20, 24 degrees over last three samples prior to LOS (should be closed / 0º). Speedbrake was commanded to "overclose" (-10 degrees), position measurements for Channels 1 thru 3 were 0 degrees. Secondary delta pressure on Ch 4 went to zero, which indicates that the channel was bypassed. This is real data and the ASAs were responding appropriately. V57H0253A
(5 Hz)
73.3 13:59:31.7 V57H0253A   nn nn nn 5 nn nn  
                                 
73.5 29.5 13:59:32   Observed aileron trim at LOS Trim: -2.3 deg (V96H2045C - V90H1500C)   73.5 13:59:32                  
                                   
74   13:59:32   M-FUS LT BL Temp at x1215 - LOS LOS V34T1106A 74 13:59:32 V34T1106A   1215 nn nn 1 nn nn  
74.5   13:59:32   LH Aft Fus Sidewall Temp at x1410 - LOS LOS V09T1724A 74.5 13:59:32 V09T1724A   1410 nn nn nn nn nn  
75   13:59:32   LMG Brake Line Temp A - LOS LOS at 172.2 F V58T1700A 75 13:59:32 V58T1700A   1116 -140.4 282.8 1 1.46 -75/+300  
76   13:59:32   LMG Brake Line Temp B - LOS LOS at 154.2 F V58T1701A 76 13:59:32 V58T1701A   1116 -139.6 282.8 1 1.46 -75/+300  
77   13:59:32   LMG Brake Line Temp C - LOS LOS at 104.8 F V58T1702A 77 13:59:32 V58T1702A   1140 -108 309 1 1.46 -75/+300  
78   13:59:32   LMG Brake Line Temp D - LOS LOS at 88.3 F V58T1703A 78 13:59:32 V58T1703A   1183 -108 312 1 1.46 -75/+300  
79   13:59:32   Left Main Gear Strut Actuator Temp - LOS LOS at 76.3 F V58T0405A 79 13:59:32 V58T0405A   1183 -115 315 1 1.46 -75/+300  
80   13:59:32   Hyd Sys 1 LMG Uplk Actr Unlk Ln Temp - LOS LOS at 52.2 F V58T0125A 80 13:59:32 V58T0125A   1159 -124 315 1 1.46 -75/+300  
81   13:59:32   Sys 2 LH Brake Sw Vlv Return Temp (AFT) - LOS LOS at 62.8 F V58T0841A 81 13:59:32 V58T0841A   1173 -107 313 1 1.46 -75/+300  
82   13:59:32   Sys 3 LMG Brake Sw Vlv Return Line Temp (FWD) - LOS LOS at 67.3 F V58T0842A 82 13:59:32 V58T0842A   1156 -110 314 1 1.46 -75/+300  
                                   
82.7 32.5 31:59:32 Approx Veh Grd Location:
32.9 N / -99.0 W
Altitude ~200700 ft / Mach ~18.1 - Near Dallas TX Approximate Vehicle Ground Location at Loss of Signal based on GMT; Data source: STS-107 GPS Trajectory Data   82.7 31:59:32                  
82.8 29.3 13:59:32.130   FCS Channel 4 fail flags raised (1 Hz) on all aerosurface actuators Lagging indicator of ASA position measurement discrepancy V79X3263X
V79X3268X
V79X3273X
V79X3278X
V79X3334X
V79X3339X
82.8 13:59:32.130                  
83 33 13:59:32.136 LOS
(Loss of Signal)
Last valid downlink frame accepted by ODRC - OI / BFS / PASS
(This time has been referred to as "LOS" thoughout the investigation.)
Start of reconstructed data
Upper Right Aft (URA) Quad Antenna was selected by BFS antenna management S/W to communicate with TDRS-W. The pointing angle to TDRS-W was off the Orb tail at -65 degs and trending further into blockage. Prev experience / eng calcs predict probable loss of comm at elevation angles greater than -60 degrees. Loss of comm at this GMT is therefore considered nominal.   83 13:59:32.136                  
84 29.3 13:59:32.195   ASA 4 RPC A&C Trip Indication Lagging indicator of ASA transducer excitation short condition V79X4210E
V76X4211E
84 13:59:32.195                  
85   deleted     Rationale for deletion: moved to 85.6 after further data review.   85 deleted                  
85.5 29.3 13:59:32.598   Left Outboard bypass valve reopens. A force fight between channels 1/2/3 and channel 4 begins, resulting in a difference of up to 0.5 degrees observed between the left outboard and inboard elevons Indicates a short in bypass valve has grown sufficient to drop below voltage threshold of valve; RPC B is current limiting. V58P0865A 85.5 13:59:32.598                  
85.6 29.3 13:59:33.680   BFS Fault Message annunciation (1) - FCS CH 4 TDRS-E Data. Error is detected by ATVC/ASA hardware when sensed delta pressure across actuator exceeds a limit indicating the FCS channel is no longer driving the actuator. FCS CH 4 failure will annunicate for any of the following: LIB / LOB / RIB / ROB elevon actutor 4, rudder actuator 4, speedbrake actuator 4, SSME 1/2/3 P/Y Actuator D, & L/R SRB R/T actuator D.   85.6 13:59:33.680                  
86 29.3 13:59:33.863   PASS Fault Message annunciation (1) - FCS CH 4 TDRS-E Data   86 13:59:33.863                  
87   13:59:33.976   Master Alarm noted. D&C analysis is continuing to determine cause of alarm.   87 13:59:33.976                  
88 29.3 13:59:34.518   Left Outboard force fight ends, driver currents go to zero.
(RPC B trip indication).
Leading indicator of RPC B trip / ASA power down. I.e., indicates opening of all bypass valves (due to RPC B trip removing power) on ASA 4. Force fight goes away since actuators are already at the last commanded position (so channel 4 has no hyd load on the servo asking for position change). V58P0865A 88 13:59:34.518                  
89 29.3 13:59:34.561   Speedbrake force fight begins (continues to LOS) Indicates opening of all bypass valves (due to RPC B trip removing power) on ASA 4. Since the speedbrake is at zero but is being commanded to "over-close" position (-10) this results in a force fight between channels 1,2,3 and channel 4. V57P0260A
V57P0261A
V57P0262A
89 13:59:34.561                  
90 35 13:59:35/36   Sideslip on vehicle changes sign. The event occurred between the two times listed. Just prior to initial LOS the magnitude of the negative Sideslip started to decrease and between 59:34 and 59:37 sideslip grew from -.6 to +.8 deg. With this change, the normal roll and yaw moments on the vehicle would change sign. Aerodynamic forces due to sideslip are now reinforcing aerodynamic asymmetry.   90 13:59:35/36                  
91 36 13:59:36   Growth in Bank attitude error Up until this time the flight control had been able to maintain the Bank error around 5 deg. Aerojet DAP drops left wing to compensate for increasing aerodymanic moments, creating a bank attitude error.   91 13:59:36                  
92 37 13:59:36.8   Aerojet DAP Requests Third Right Yaw RCS Jet (R4R) This additional jet is required to counteract the increasing aerodynamic moments on the vehicle. The RCS jet fired, as expected and stayed on to end of first 5-sec period of recon data at 032/13:59:37.4 GMT.   92 13:59:36.8                  
93 38 13:59:37.3   Aerojet DAP Requests Fourth Right Yaw RCS Jet (R1R) This additional jet is required to counteract the increasing aerodynamic moments on the vehicle. The RCS jet fired, as expected and stayed on to end of first 5-sec period of recon data at 032/13:59:37.4 GMT.   93 13:59:37.3                  
94 39 13:59:37.n   Last aileron data The aileron position is now approx -5.2 deg with approx -2.5 deg of aileron trim. The rate of change of aileron trim had reached the maximum allowed by the flight control system.   94 13:59:37.n                  
                                   
95 40 13:59:37.396 End of 5 second period of reconstructed data End of first 5-seconds of the 32-second period of post-LOS data. Start of approximately 25 seconds of no data available GMT derived by MER data personnel   95 13:59:37.396                  
96 41 13:59:46.347   PASS Fault Message annunciation - ROLL REF Message retrieved from "fault message buffer" received between 14:00:04 and 14:00:05. The ROLL REF message is triggered when Roll command req'd to fly reference profiile falls below 37 degs. Message generation less than 10 secs (5 guidance cycles) after start of 4 yaw jets firing suggests rapid change in Lift to Drag ratio.   96 13:59:46.347                  
          Note: BFS does not have this message in the Fault message stack. It is likely that BFS annunciated this message during the 25 second gap of no data, but that if it was annunciated it was pushed out of the downlist stack by additional fault messages (at least 5) annunciated during the gap.                        
97 41 13:59:52.114   PASS Fault Message annunciation - L RCS LEAK Data located in PASS fault message buffer. Data is potentially error prone.   97 13:59:52.114                  
98 41 14:00:01.540*   BFS Fault Message annunciation - L RCS LEAK Data located in BFS fault message buffer. Data is potentially error prone.
*Time info corrupted.
  98 14:00:01.540*                  
99 41 14:00:01.900*   BFS Fault Message annunciation - L RCS LEAK Data located in BFS fault message buffer. Data is potentially error prone.
*Time info corrupted.
  99 14:00:01.900*                  
100 42 14:00:02/06   Debris A observed leaving the Orbiter - Large debris seen falling away from the Orbiter envelope.   EOC2-4-0024
EOC2-4-0018
EOC2-4-0118
100 14:00:02/06                  
101 43 14:00:02.654   PASS Fault Message annunciation - L RCS LJET Data is potentially error prone.   101 14:00:02.654                  
102 44 14:00:02.660 Beginning of 2 second period of reconstructed data Start of last 2-seconds of the 32 second period of post-LOS data. GMT derived by MER data personnel.   102 14:00:02.660                  
        CAUTION: Data from this period is suspect because multiple bit errors were evident in this reconstructed data. Many of the parameters were 1 Hz data and therefore only one data sample was available. Where possible, high rate data and/or corroborating data were used to draw subsystem performance conclusions. However, some of the conclusions drawn below may be in error or misinterpreted.                        
        During this final 2 second period of reconstructed data, the data indicates the following systems were nominal: APUs were running and WSB cooling was evident (although potentially overcooling). MPS integrity was still evident. Fuel cells were generating power and the PRSD tanks/lines were intact. Comm and navaids systems in the forward fuselage were performing nominally. RSB, Body Flap, main engine, and right wing temps appeared active. With the exception of an apparent FES shutdown, ECLSS performance was nominal.                        
        During this final 2 second period of reconstructed data, the data indicates the following systems were off-nominal: All three Hyd systems were lost (zero pressure/zero rsvr qty's). The left inbd/outbd elevon actuator temps were either OSL or no data exists. WSB's appeared to be overcooling APU lube oil. The FES appeared to have shutdown. Majority of left OMS pod sensors were either OSH or OSL or no data exists. Multiple BFS and PASS fault message annunciations for left pod hardware were found in the buffer. Elevated temps at bottom bondline centerline skin forward and aft of the wheel wells and at the port side structure over left wing were observed. EPDC shows general upward shift in Main Bus amps and downward shift in Main Bus volts. AC3 phase A inverter appeared disconnected from the AC Buss.                        
        GNC data suggests vehicle was in an uncommanded attitude and was exhibiting uncontrolled rates. Yaw rate was at the sensor maximum of 20 deg/sec. The flight control mode was in AUTO. (Note that all Nav-derived parameters (e.g., alpha) are suspect due to high rates corrupting the IMU state.)                        
        Based on the nominal and off-nominal system performance described above, it appears that the fwd/mid/aft fuselage, right wing, and right pod were still intact.                        
103 45 14:00:03.470*   BFS Fault Message annunciation - L OMS TK P Data located in BFS fault message buffer after acquisition of data. Data is potentially error prone. *Time info corrupted.
Note: Error is annunciated when left OMS oxidizer tank ullage pressure (V43P4221C) or fuel tank ullage pressure (V43P4321C) is out of limits high or low. Oxidizer limits - High: 288 psi; Low 234 psi; Fuel limits - High: 288 psi; Low: 234 psi.
  103 14:00:03.470*                  
103.5 45 14:00:0n.nnn   BFS Fault Message annunciation - In-determinant     103.5 14:00:0n.nnn                  
104 45 14:00:0n.nnn*   BFS Fault Message annunciation - SM1 AC VOLTS Occurred after L OMS TK P message. Data is potentially error prone. *Time info corrupted.
Note: Error message indicates that AC Bus 3 phase A, B, or C voltage (V76V1700A, V75V1701A, V76V1702A) is out of limits high or low. Low limit for all 3 parameters is 108VAC; High limit is 123VAC.
  104 14:00:0n.nnn*                  
105 45 14:00:03.637   PASS Fault Message annunciation - L RCS PVT Data is potentially error prone.   105 14:00:03.637                  
106 46 14:00:03.637   PASS Fault Message annunciation - DAP DNMODE RHC The software process which logs the PASS message runs every 1.92 seconds, so event could have occurred as early as 14:00:01.717 GMT. The fault message was corroborated by an initialization flag for the aerojet DAP roll stick function. However, during the 2 sec period, available vehicle data indicates RHC was in detent & DAP was in AUTO. Data is potentially error prone.   106 14:00:03.637                  
          Note: BFS downlist bits indicating CSS mode are initialized to "ON" for entry because BFS does not have an "Auto" mode, is always CSS, and will drive the eyebrow panel lights ON if engaged. These bits are always on in BFS through all of OPS 3 until touchdown.                        
107 47 14:00:04.826 End of 2 second period of reconstructed data Last identifiable OI Downlink frame GMT derived by MER data personnel. Last recognizable Downlist frame (BFS & PASS) was approx 60 ms earlier.   107 14:00:04.826                  
                                   
108 48 14:00:17/21   Debris B observed leaving the Orbiter Time is for debris first seen well aft of Orbiter envelope. EOC2-4-0024
EOC2-4-0118
108 14:00:17/21                  
                                   
109 48 14:00:18/22   Debris C observed leaving the Orbiter Time is for debris first seen well aft of Orbiter envelope. EOC2-4-0024
EOC2-4-0118
109 14:00:18/22                  
                                   
                                   
110 49 14:00:21/25   Vehicle Main Body break-up Onset of vehicle main body break-up EOC2-4-0024
EOC2-4-0018
EOC2-4-0118
110 14:00:21/25                  
                                   
111 50 14:00:53 End of Peak Heating   Determined by analysis   111 14:00:53                  
                                   
  = Expected/Nominal performance or event nn = data still needed   = Expected/Nominal performance or event nn = data still needed