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A helicopter landing pad (helipad) is a landing area or platform for helicopters. While helicopters are able to operate on a variety of relatively flat surfaces, a fabricated helipad provides a clearly marked hard surface away from obstacles where a helicopter can land safely. Larger helipads, intended for use by helicopters and other VTOL or powered lift aircraft, may be called ''vertiports.'' An example is Vertiport Chicago〔http://www.vertiportchicago.com〕 which opened in 2015.〔http://wgntv.com/2015/04/30/vertiport-opens-in-downtown-chicago/〕 ==Usage== Helipads may be located at a heliport or airport where fuel, air traffic control and service facilities for aircraft are available. However, most helipads are located remotely away from such facilities due to space and cost constraints. Some office towers maintain a helipad on their roofs in order to accommodate air taxi services. Some basic helipads are built on highrise buildings for evacuation in case of a major fire outbreak. Major police departments may use a dedicated helipad at heliports as a base for police helicopters. Large ships and oilrigs sometimes have a helipad on board (usually referred to as a helicopter deck or helideck). Helipads are common features at hospitals where they serve to facilitate MEDEVACs or air ambulance transfers of patients to trauma units or to accept patients from remote areas without local hospitals or facilities capable of providing the level of emergency care required. In urban environments, these heliports are typically located on the roof of the hospital. Rooftop helipads sometimes display a large two-digit number, representing the weight limit (in thousands of pounds) of the pad. In addition, a second number may be present, representing the maximum rotor diameter in feet.〔(FAA Advisory Circular 150/5390-2B ) page 51〕 Location identifiers are often, but not always, issued for helipads. They may be issued by the appropriate aviation authority. In the United States authorized agencies include the FAA, ICAO, TC and IATA. Some helipads may have location identifiers from multiple sources, and these identifiers may be of different format and name. 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「helipad」の詳細全文を読む スポンサード リンク
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