Crew noticed ice buildup on plane's wings

Flight recorder sent to D.C.

The wreckage of Continental Connection Flight 3407 was seen where it crashed into a house in Clarence, N.Y., Thursday. Officials have not determined the cause of the crash. The wreckage of Continental Connection Flight 3407 was seen where it crashed into a house in Clarence, N.Y., Thursday. Officials have not determined the cause of the crash. (David Duprey/AP)
By Carolyn Thompson
Associated Press / February 14, 2009
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BUFFALO - The crew of the commuter plane that crashed into a house, killing all 49 people aboard and one person on the ground, noticed significant ice buildup on the wings and windshield just before the aircraft began pitching and rolling violently, investigators said yesterday.

Officials stopped short of saying the ice buildup caused Thursday night's crash, and stressed that nothing has been ruled out. But ice on the wings can interfere catastrophically with an aircraft's handling and has been blamed for a number of major air disasters over the years.

Continental Connection Flight 3407, traveling from Newark, N.J., went down in light snow and mist - ideal conditions for ice to form - about six miles short of the Buffalo airport, plunging nose-first through the roof of a house in the suburb of Clarence.

All 44 passengers, four crew members, an off-duty pilot, and one person on the ground were killed. Two others escaped from the home, which was engulfed in a raging fireball that climbed higher than the treetops and burned for hours, making it too hot to begin removing the bodies until around nightfall yesterday.

Among the passengers killed was a woman whose husband died in the World Trade Center attacks of Sept. 11.

It was the nation's first deadly crash of a commercial airliner in two years. On Aug. 27, 2006, 49 people were killed after a Comair jetliner mistakenly took off from a Lexington, Ky., runway that was too short.

In general, smaller planes like the commuter plane that crashed Thursday, which uses a system of pneumatic de-icing boots, are more susceptible to ice buildup than larger commuter planes that use a system to warm the wings. The boots, a rubber membrane stretched over the surface, are filled with compressed air to crack any ice that builds up.

A similar turboprop jet crash 15 years ago in Indiana was caused by ice, and after that the National Transportation Safety Board recommended more aggressively using pneumatic de-icing boots. But the Federal Aviation Administration has not adopted the recommendation. It remains on the NTSB's list of most-wanted safety improvements.

Investigators pulled the black-box recorders from the wreckage, sent them to Washington, and immediately began analyzing the flight data and listening to the cockpit conversations.

Steve Chealander, a spokesman for the NTSB, said at an afternoon news conference that the crew of the twin-engine turboprop discussed "significant ice buildup" on the windshield and the leading edge of the wings at an altitude of about 11,000 feet as the plane was coming in for a landing.

The flight data recorder indicated the plane's de-icing equipment was in the "on" position, but Chealander would not say whether the equipment was functioning.

The landing gear was lowered one minute before the end of the flight at an altitude of more than 2,000 feet, and 20 seconds later the wing flaps were set to slow the plane down, after which the aircraft went through "severe pitch and roll," Chealander said.

The crew raised the landing gear at the last moment, just before the recording ran out. No mayday call came from the pilot.

Doug Hartmayer, a spokesman for Niagara Frontier Transportation Authority, which runs the Buffalo airport, said: "The plane simply dropped off the radar screen."

"Icing, if a significant buildup, is an aerodynamic impediment, if you will," Chealander said. "Airplanes are built with wings that are shaped a certain way. If you have too much ice, the shape of the wing can change, requiring different airspeeds."

But he declined to draw any conclusions from the data, and cautioned: "We are not ruling anything in or anything out at this time."

One of the survivors from the house, Karen Wielinski, 57, told WBEN-AM that she was watching TV in the family room when she heard a noise. She said her daughter, 22-year-old Jill, who also survived, was watching TV in another part of the house.

"Planes do go over our house, but this one just sounded really different, louder, and I thought to myself, 'If that's a plane, it's going to hit something,' " she told the station. "The next thing I knew, the ceiling was on me."

She said she and her daughter escaped in their stocking feet.

She said she hadn't been told the fate of her husband, Doug, but added: "He was a good person, loved his family."

Witnesses heard the plane sputtering before it plunged squarely through the roof of the house.

William Voss, a former official of the FAA and president of the Flight Safety Foundation, a nonprofit advocacy group, said the plane's near-vertical drop suggests that ice or a mechanical failure, such as wing flaps deploying asymmetrically or the two engines putting out different thrust, caused the crash.

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