Helicopter flight controls blades collectively ("i.e.," all at the same time) and independent of their position. Therefore, if a collective input is made, all the blades change equally, and as a result, the helicopter increases or decreases its total lift derived from the rotor. In level flight this would cause a climb or descent, while with the helicopter pitched forward an increase in total lift would produce an acceleration together with a given amount of ascent. The collective pitch control in a Boeing CH-47 Chinook is called a "thrust control", but serves the same purpose, except that it controls two rotor systems, applying
1994 Scotland RAF Chinook crash 1994 Scotland RAF Chinook crash The 1994 Mull of Kintyre RAF Chinook crash occurred on 2 June 1994 at about 18:00 hours when a Royal Air Force (RAF) Chinook helicopter (serial number "ZD576", callsign "F4J40") crashed on the Mull of Kintyre, Scotland. The crash, which occurred during thick foggy conditions, resulted in the deaths of all twenty-five passengers and four crew on board. Among the passengers were almost all the United Kingdom's senior Northern Ireland intelligence experts. The accident holds the distinction of being the worst peacetime disaster to have been suffered by the RAF. In 1995, an RAF board