By Lukas I. Alpert

MOSCOW--The crash of a Russian Sukhoi Superjet 100 during a test flight in Iceland has no bearing on the jet's commercial use because the type of landing involved is not currently performed by airlines operating the plane, the aircraft's manufacturer said Monday.

The plane made a belly-landing at Rekjavik's Keflavik International Airport early Sunday morning during a certification test in which the pilots relied on the jet's fully automated landing system while coping with heavy crosswinds and a simulated failure of one of its engines.

Airlines using the plane currently do not perform fully automated landings, said manufacturer Sukhoi Civil Aircraft.

The plane was carrying three crewmembers and two certification experts, one of whom broke his leg while disembarking from the aircraft. The other four were not hurt.

The accident comes little more than a year after a fatal accident with another aircraft on a demonstration flight that killed 45 in Indonesia.

The manufacturer said the plane is being extensively tested under a variety of conditions for additional certification for instrument landing in which a pilot uses indicators and gauges to land rather than visual cues when visibility is poor. The company said the plane has already been successfully tested for 250 different kinds of landings under similar conditions.

"Test flights to evaluate the performance of the automatic landing system with strong crosswind conditions are the most complicated part of the trials. Their purpose is to prevent possible in-flight emergency situations. The test flights conditions are in close proximity with extreme flight regimes in order to identify limits of safe operations of the aircraft," the company said in a statement.

Keflavik Airport is known for its heavy crosswinds and frequently draws test aircraft from Boeing Co. (BA) and Airbus to perform dramatic landings under extreme wind conditions.

The all-new Sukhoi jetliner, which entered service in 2011, is the first civilian aircraft developed in Russia since the fall of the Soviet Union and is the centerpiece of the country's efforts to reassert itself as a global force in civil aviation. The Superjet can carry about 100 people and is offered at a lower price than similar aircraft built by Brazil's Embraer SA (ERJ) and Canada's Bombardier Inc. (BBD.A.T), but has had trouble attracting customers.

Sukhoi Civil Aircraft said earlier this month that it is in talks for possible restructuring of its $2 billion debt.

Write to Lukas I. Alpert at lukas.alpert@dowjones.com

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