LHASA (Sept. 12) XINHUA - A three-engined MD-11 plane from the US-owned MD Aircraft Manufacturing Corporation made a successful landing and take-off at an airfield on the "roof of the world" today.

The trial flight and landing test also included a test with one engine deliberately stopped. It took place in Lhasa's Konggar Airport, which has the world's highest elevation for an airport.

The test was made by the U.S. MD Aircraft Manufacturing Corporation to show the plane's quality characteristics in the high plateau, in an effort to market the MD-11 to airlines operating flights to Tibet.

Dundrub, vice-chairman of Tibet Autonomous Region, who watched the test, congratulated the success of the trial flight.

He held that the test indicated that air routes to Tibet may add another type of aircraft.

He hoped that the MD company will play a positive role in promoting Tibet's aviation services.

Deputy President of MD company, Margaret S. Billson, said her company has a long history in cooperation with China, and is ready to provide MD passenger planes of high quality to China at any time.

Konggar Airport is located 3,538 meters above sea level where air is thin.

The high plateau environment, and air flow mean there are special requirements for Tibet-bound planes.

China has been cautious on choosing passenger planes for air routes to Tibet. Trial flights by aircraft from major foreign companies are made in Tibet each time China considers introducing planes.