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A flight helmet, sometimes nicknamed a "bone dome", is a special type of helmet primarily worn by military aircrew. A flight helmet can provide:〔Aerospace International (magazine), March 2011, pages 26-29〕 * Impact protection to reduce the risk of head injury (e.g. in the event of a parachute landing) and protection from wind blast (e.g. in the event of ejection). * A visor to shield the eyes from sunlight, flash and laser beams. * Noise attenuation, headphones and a microphone (except when included in a mask). * A helmet mounted display, mounting for night vision goggles and/or a helmet tracking system (so the aircraft knows where the pilot is looking). The design of a flight helmet may also consider:〔Aerospace International (magazine), March 2011, pages 26-29〕 * Comfort - including the weight, centre of gravity and provision for cooling and ventilation. * Compatibility with an oxygen mask (for high altitude flight and NBC protection). ==History of flight helmets== In the first days of aviation the leather helmets used in motor-racing were adopted by pilots as head protection. The initial design of early leather flying helmets was adapted during the 1930s to become the type B helmet which enabled the external attachment of radio earphones oxygen masks and removable googles to protect pilots eyes from the elements.〔http://www.456fis.org/HISTORY_OF_FLIGHT_HELMETS.htm〕 By World War II, an oxygen mask was added to the equipment as planes flew higher where thinner air required a breathable air supply to the pilots and crew. After World War II into the Korean War, the leather headpiece was gradually replaced with a hard helmet needed as head protection during bailing out (and later with high velocity ejection).〔(【引用サイトリンク】url=http://www.salimbeti.com/aviation/helmets1.htm )〕 Also, goggles were replaced by a visor that was incorporated to the helmet and tinted to protect against sun. Current head gear (appears after the Vietnam War) also includes communications equipment (head set and microphones) to let pilots communicate with ground operations and their crew.〔(【引用サイトリンク】url=http://www.buzzle.com/articles/pilot-oxygen-mask.html )〕 Image:A-9 oxygen mask.jpg|Type B-6 winter flying helmet with A-9 oxygen mask, WW2 vintage Image:Gsh-6 pilot helmet.JPG|Soviet MiG-25 pilot helmet of the 1980s Image:Integrated Helmet Display Sight System.jpg|Modern US Army Apache helmet Image:SPH-5 helmet.jpg|Gentex SPH-5 helicopter helmet 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「flight helmet」の詳細全文を読む スポンサード リンク
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