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CHRONOLOGY OF ACTIVITIES
| December
24, 1999 - February 7, 2000 |
Preparation for ILV assembly. |
| February
8-23, 2000 |
ILV assembly. |
| February
24, 2000 |
ILV transfer from ACS to LP.
|
| February
25-27, 2000 |
Performance of two ILV tests under the Dry Roll-Out
program.
|
| February
27 - March 9, 2000 |
LP/ACS transit to the launch site.
|
| March
10-13, 2000 |
Pre-launch
processing at the launch site. |
| March
12, 2000 |
ICO-F1 launch at 6:49:15 A.M. Eastern Pacific Time.
ILV Stage 2 launch abort on the 471st second.
|
The failure cause analysis panel has stated that the launch
abort was caused by the non-issue (during launch processing
105 s prior to launch) of a command to close a electropneumatic
valve (ÝÏÊ ÂÇÒ23) of LV Stage 2 pneumatic system from the
Ground Complex of Automated Control Systems of Processing
and Launch. As a result of it, due to considerable gas release
from LV Stage 2 onboard bottles the starting and operation
of LV Stage 2 steering engine were performed in off-nominal
conditions with subsequent unauthorized termination of steering
engine operation. The absence of a command to close ÝÏÊ
ÂÇÒ23 in the pre-launch processing control law was the result
of a logical mistake made by the developer during the control
law updating prior to launch of Zenit-3SL ILV with ICO-F1
SC.
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