Posted: Fri, Aug 20, 2010, 7:43 AM ET (1143 GMT)

WhiteKnightTwo (WK2), the carrier aircraft for Virgin Galactic's SpaceShipTwo (SS2) suborbital spacecraft, had part of its landing gear collapse upon landing after a test flight Thursday. The left main landing gear on the twin-hulled aircraft collapsed when it landed at the Mojave Air and Space Port in California Thursday morning. The aircraft was completing its 37th test flight; SpaceShipTwo was not attached to WK2 on that flight. Scaled Composites, which is building WK2 and SS2 for Virgin, described the problem as a "minor incident" with no injuries. An FAA spokesman told the AP that while the landing gear was damaged, it was not yet clear if the aircraft sustained any other damage.