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During the 1990s, a series of issues affecting the rudder of Boeing 737 passenger aircraft resulted in multiple incidents. In two separate accidents (United Airlines Flight 585 and USAir Flight 427), pilots lost control of their aircraft due to a sudden and unexpected rudder movement, and the resulting crashes killed everyone on board, 157 people in total. [1]
The National Transportation Safety Board (NTSB) has released its concluding report into the crash that occurred on March 3, 1991, involving United Airlines Flight 585. Based on the findings of the research, it was determined that the crash was brought about by a mechanical breakdown in the rudder power control unit of the aircraft. [3]
The rudder is a fundamental control surface which is typically controlled by pedals rather than at the stick. It is the primary means of controlling yaw—the rotation of an airplane about its vertical axis. The rudder may also be called upon to counter-act the adverse yaw produced by the roll-control surfaces.
WASHINGTON (Reuters) -The Federal Aviation Administration said on Tuesday it issued a safety alert to airlines warning of the potential for limited or jammed rudder movement on certain Boeing 737 ...
The yaw axis has its origin at the center of gravity and is directed towards the bottom of the aircraft, perpendicular to the wings and to the fuselage reference line. Motion about this axis is called yaw. A positive yawing motion moves the nose of the aircraft to the right. [1] [2] The rudder is the primary control of yaw. [3]
Due to reorganizations in 1993 and 1998, the current Raymarine - at the time still under the name of the parent company - was created. In January 2001, Raymarine was formed when the division was acquired in a management buy-out backed by Hg. [4] In December 2004 the company was floated on the London Stock Exchange quadrupling Hg's investment. [5]
The display contains hash marks for the pilot's reference during a turn. When the needle is lined up with a hash mark, the aircraft is performing a "standard rate turn" which is defined as three degrees per second, known in some countries as "rate one". This translates to two minutes per 360 degrees of turn (a complete circle).
The cause was initially a malfunction in two of the plane's rudder travel limiter units, followed by incorrect actions by the crew which eventually led the plane to stall while encountering a thunderstorm. The crew ignored the recommended procedure to deal with the problem and reset a circuit breaker which further disengaged the autopilot and ...