Return to Human Space Flight home page

Mission Control
Answers Your Questions

From: Ron Rogers, of Kansas City
To: Tony Ceccacci, flight director for the orbit 2 team

Question: There are three orbit-boost procedures planned for this mission - why not do them all at once, in one big boost?

Answer: Since the orbiter hardware used to perform the reboosts wasn't specifically designed for the types of firing patterns required to perform reboosts, extensive engineering analysis was performed to see how long the hardware could safely be used. Early results showed that a one-hour time period was what the vernier thrusters could support with the duty cycles that were going to take place so reboosts are planned to take place in one-hour time blocks. The three reboosts taking place use different methods. There will be two sessions performed that use the primary RCS plus X thrusters for reboost and one session that only uses the vernier thrusters. The two reboost methods also require a different orbiter orientation and will be taking propellant from different systems.

Dean Lenort
Orbit 2 Propulsion Officer

View a list of answered questions or ask MCC your own question.

Curator: Kim Dismukes | Responsible NASA Official: John Ira Petty | Updated: 06/16/2002
Web Accessibility and Policy Notices