Flying the Challenger ultralight aircraft with doors, Quad City Challenger ultralight door installation.

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Flying the Challenger ultralight aircraft with doors

The following can be found at: http://www.itsasafety.org/Aviation/CHI/lnarr_95A144.htm 

CHI95LA144

On May 2, 1995, at 1550 eastern daylight time, an ultralight Challenger, N100GB, was destroyed when it impacted trees shortly after taking off from a private grass strip in Bridgeport, Michigan. The pilot, who was not injured, reported a loss of control. The local 14 CFR Part 91 flight operated without flight plan in visual meteorological conditions.

According to the pilot, while making a right climbing turn after takeoff, at approximately 500 feet above the ground, the airplane started to bank to the left. The pilot stated despite his use of full right rudder, the banking continued. He continued to stated, "The plane kept tightening up into a left flat spiral to the ground."

The pilot had approximately 4 hours of flight time in the Challenger. The optional kit doors were installed on the ultralight during all four hours of flight time.

In a telephone interview, the pilot stated that he had experienced this same type of left banking once before while landing. In that incident he was able to regain control of the ultralight. The pilot stated he believes that the ailerons of the Challenger are almost non-effective and a pilot needs to use the rudder more then in any other airplane that he has ever flown before. He stated that the rudder has to be used to make the Challenger turn.

The Chief Engineer with Popular Flying Association in the United Kingdom, stated in a telephone interview that the Challenger is directionally unstable when the doors are installed. As a result, several modifications to the Challenger are mandatory before their operation is permitted in the United Kingdom. The modification consists of the installation of a larger tail fin, rudder, and reinforcements.

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This investigator has spoken to the President of the Quad City Ultralight Aircraft Corporation, the Challenger manufacturer, on several occasions concerning the flight characteristics of the Challenger when the doors are installed. In a written statement, the president stated the Challenger II was designed in 1984 as a two place ultralight trainer to be used by Challenger dealers to train their customers to fly the single seat Challenger ultralight. The president stated, "We never intended [the Challenger] to have doors." The doors were designed by a Challenger dealer in Canada. A set of these doors were purchased by Quad City Ultralight Aircraft Corporation and installed. The president stated, "We liked the doors for winter flying and noticed no stability problems other than they made the plane more rudder dominated; i.e., you had to steer more with your feet than previously." Because of the large request, Quad City Ultralight Aircraft Corporation started offering the doors in kit form to their customers and dealers.

When questioned about the directional stability of the Challenger when the doors are installed, the president stated he believes the problem lies in the inexperience of the pilots. He stated the Challenger is a rudder dominant and sensitive airplane. He continued to stated that when the doors are installed, a pilot can not take his feet off the rudder pedals. The president stated that inexperienced pilots find it difficult to adapt to this kind of flying.

Challenger ultralight doors

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