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 |
nn nn |
nn nn |
nn nn |
nn nn |
nn nn |
nn nn |
|||
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 |
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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 |
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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 nn nn |
nn nn nn |
nn nn nn |
nn nn nn |
nn nn nn |
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 | 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 |