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1955 MacArthur Airport United Airlines crash

1955 in New York (state)Accidents and incidents involving the Douglas DC-6Airliner accidents and incidents caused by pilot errorAirliner accidents and incidents in New York (state)April 1955 events in the United States
Aviation accidents and incidents in the United States in 1955Islip (town), New YorkPages containing links to subscription-only contentUnited Airlines accidents and incidents
6609 UAL DC 6 NorthRampStapletonDEN
6609 UAL DC 6 NorthRampStapletonDEN

On April 4, 1955, a United Airlines Douglas DC-6 named Mainliner Idaho crashed shortly after taking off from Long Island MacArthur Airport, in Ronkonkoma, Islip, New York, United States. The flight was operated for the purpose of maintaining the currency of the instrument rating of two of the airline's pilots. Shortly after takeoff and only seconds after climbing through 150 feet (46 m), the plane began banking to the right. It continued to roll through 90 degrees; the nose then dropped suddenly and moments later it struck the ground. All three members of the flight crew were killed upon impact. A subsequent investigation found a simulated engine failure procedure was being conducted, which involved a member of the crew pulling back the throttle lever for engine No. 4 prior to taking off. Investigators found that if the throttle lever was pulled back too far, it would cause the propeller to reverse—a feature designed to slow the aircraft upon landing. Once the landing gear was raised, the crew would have to raise a metal flag in the cockpit to bring the propeller blades back into the correct position, since a safety device prevented electric power from operating the rotating mechanism at the roots of the blades unless the aircraft was on the ground or the flag was manually raised. The Civil Aeronautics Board (CAB) concluded one of the flight crew applied full power to No. 4 engine, thinking this would bring the aircraft out of the increasing bank. Because the blades were reversed and the flag was not raised, that increased the reverse thrust from No. 4 engine, causing the DC-6 to spiral out of control. Since the plane was so close to the ground, the suddenness of the bank and dive meant the flight crew had no chance to recover the aircraft before impact. In the aftermath of the accident, the Civil Aeronautics Administration (CAA) issued an Airworthiness Directive ordering all DC-6 and DC-6B aircraft to be fitted with a manual device which could prevent the inadvertent reversal of the propeller blades. United Airlines also stated they had begun installing reverse thrust indicator lights in the cockpits of their DC-6 aircraft, which would warn pilots when a propeller had reversed.

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1955 MacArthur Airport United Airlines crash
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Geographical coordinates (GPS)

Latitude Longitude
N 40.795277777778 ° E -73.100277777778 °
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Address

Long Island MacArthur Airport

Union Street
11779 , Lake Ronkonkoma
New York, United States
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6609 UAL DC 6 NorthRampStapletonDEN
6609 UAL DC 6 NorthRampStapletonDEN
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Bohemia, New York
Bohemia, New York

Bohemia is a hamlet (and census-designated place) in Suffolk County, New York, United States. The population was 10,180 at the 2010 census. It is situated along the South Shore of Long Island in the Town of Islip, approximately 50 miles from New York City. Bohemia is bordered by Central Islip and Great River to the west; Islandia, Ronkonkoma and Lake Ronkonkoma to the north; Holbrook to the east; and Oakdale, Sayville, West Sayville, and Bayport to the south. The main school district in the town is the Connetquot School District. The zip code is 11716 and the telephone area code is 631. Many of Bohemia's current residents trace their ethnic heritage back to southern Italy, Ireland, and the former Czechoslovakia; although the town has become more diverse in recent years. A large percentage of Bohemia's growing population has migrated to the town from western Long Island, Brooklyn, and Queens. Accordingly, there is a sizable population of first generation Bohemians. The town is near the Oakdale and Ronkonkoma stations of the Long Island Rail Road, providing easy access to Manhattan where many residents work. Long Island MacArthur Airport is partially located in Bohemia (along with the bordering town of Ronkonkoma, New York). The airport serves travelers from the Greater New York Metropolitan Area and around the nation who want a more convenient alternative to the congestion at JFK and Laguardia airports. The airport's most popular destinations include: Orlando, Florida; Chicago, Illinois; West Palm Beach, Florida; and Las Vegas, Nevada. Bohemia is a short drive from the Sayville Ferry Service of the Fire Island National Seashore which provides access to some of Long Island's most pristine and least crowded ocean beaches.Connetquot River State Park is also located in Bohemia. The park provides an ideal location for horse back riding and because of this, the town harbors a unique equestrian culture. Many of the homes located along the park have stables and it is common to see locals walking their horses through the town's tree lined streets.