The launch was initially re-scheduled due to a chamber pressure anomaly observed during the Delta IV medium configuration launch of a Global Positioning Satellite (GPS) IIF-3 on October 4, 2012. While the mission successfully placed the GPS satellite in a precise orbit, a lower than normal chamber pressure was observed on the Delta IV RL 10 upper stage engine.
ULA says that although the team investigating the lower-than-normal upper-stage engine chamber pressure has been making good progression reviewing and analyzing the data, ULA leadership and the Air Force have decided to post-pone the launch for two weeks to allow for additional flight data anomaly investigation activities and a thorough crossover assessment for the X-37B OTV launch vehicle to be completed.
This mission, named OTV-3, will be a re-flight of the first X-37B OTV, which was successfully recovered at Vandenberg AFB Dec. 3, 2010, after 224 days on orbit.
OTV-2, which also launched from Cape Canaveral Air Force Station, Fla., March 5, 2011, conducted on-orbit experiments for 469 days during its mission.
The X-37B is the newest and most advanced re-entry spacecraft. Managed by the Air Force Rapid Capabilities Office, the X-37B program performs risk reduction, experimentation and concept of operations development for reusable space vehicle technologies.
“With the retirement of the Space Shuttle fleet, the X-37B OTV program brings a singular capability to space technology development,” said Lt. Col. Tom McIntyre, X-37B program manager. “The return capability allows the Air Force to test new technologies without the same risk commitment faced by other programs.”