The U.S. Navy's second X-47B Unmanned Combat Air System (UCAS) will be able to withstand all structural stresses and strains associated with takeoff, flight and landing - including those uniquely linked with landing or taking off from the moving, pitching deck of an aircraft carrier. That's the conclusion of an analysis by a Navy/Northrop Grumman Corporation test team following a rigorous, five-week series of structural proof tests of the jet's airframe.

The tests on X-47B air vehicle 2 (AV-2) were completed January 24, one week ahead of schedule. Northrop Grumman is the Navy's prime contractor for the Unmanned Combat Air System-Demonstration (UCAS-D) program.

AV-2 is identical to the first X-47B UCAS demonstration aircraft (AV-1) - which successfully completed its historic 29-minute first flight at Edwards Air Force Base, California, on 04 February - except that it will be equipped with aerial refueling equipment. Northrop Grumman plans to use AV-2 to demonstrate unmanned air-to-air refueling - using both the U.S. Air Force's boom/receptacle approach and the Navy's probe and drogue approach - in 2014 as part of a technology demonstration related to the current UCAS-D contract.

The proof testing performed on AV-2 simulated eight design conditions, such as a 3-G symmetrical pull up and a 2.4G rolling pullout; and five conditions expected to occur on the ground, including takeoff and landing, said Sarah Beaudin, Northrop Grumman's AV-2 Manager.

Proof testing is one of the last few tests that AV-2 will undergo before its transition later this spring to Edwards Air Force Base for more system tests, taxi tests and first flight. Before that move occurs, the test team plans to test and calibrate the aircraft's fuel system, and paint the aircraft.
 
Under a UCAS-D contract awarded in 2007, Northrop Grumman has designed, developed and produced two X-47B aircraft. In 2013, these aircraft will be used to demonstrate the first carrier-based launches and recoveries by an autonomous, strike-fighter sized unmanned aircraft. The UCAS-D program will also be used to mature relevant carrier landing and integration technologies, and to demonstrate autonomous aerial refueling by the X-47B aircraft.

Northrop Grumman's UCAS-D industry team includes GKN Aerospace, Lockheed Martin, Pratt & Whitney, Eaton, GE, Hamilton Sundstrand, Dell, Honeywell, Goodrich, Moog, Wind River, Parker Aerospace, and Rockwell Collins.