- Feb 4, 2008
- Reaction score
Yes, ideally we would have the proper sound coverage (we do for the Terminal Countdown), but for now you have to know your systems and timing. The GLS is (or at least should be) very picky. The first launch attempt of STS-88 ended in a scrub at T-23 seconds due to a late pick-up of held count at T-31 seconds due to need to further troubleshoot a Master Alarm generated by hydraulic system 1 when APU 1 was started. Turned out be caused by a "switch tease" by the APU 1 START/OPR switch on panel R2 and not system fault. The switch tease caused a automatic T-4 minutes due to the Master Alarm. It was decided after a few minutes of discussion to resume the countdown but have CGLS insert and manual hold at T-31 where they would hold the countdown again, if the problem was not resolved at that point.Also the SSU specific user interface is rather clunky, but its open-source, so its possible to improve it, for example to include feedback from mission control (Needed since the crew doesn't have full authority over the spacecraft). Also, there is the Space Shuttle Vessel fork of SSU, with ongoing development by GLS, which might see a first release in the closer future.
The CAPU, CISL, CHYD and CGLS engineers in the launch team just took a bit too long on the outbrief to the OTC and NTD for the NTD to give CGLS the clearance to resume the count. By the time CGLS had hit the "RESUME" button, it was too late and the launch window had expired leading to a manual cut-off command direction to CGLS from the NTD.