While helicopters and powered lift aircraft are able to operate on a variety of relatively flat surfaces, a fabricated helipad provides a clearly marked hard surface away from obstacles where such aircraft can land safely.
Most helipads are located remote from populated areas due to sounds, winds, space and cost constraints, however, some skyscrapers 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.
Helipads are common features at hospitals where they serve to facilitate medical evacuation or air ambulance transfers of patients to trauma centers or to accept patients from remote areas without local hospitals or facilities capable of providing the level of emergency medicine 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.
Location identifiers are often, but not always, issued for helipads. They may be issued by the appropriate aviation authority. Authorized agencies include the Federal Aviation Administration in the United States, Transport Canada in Canada, the International Civil Aviation Organization, and the International Air Transport Association. Some helipads may have location identifiers from multiple sources, and these identifiers may be of different format and name.
Helipads are usually constructed out of concrete and are marked with a circle and/or a letter "H", so as to be visible from the air. However, they are not always constructed out of concrete; sometimes wildfire fighters will construct a temporary helipad out of timbers to receive supplies in remote areas. Rig mats may be used to build helipads. Landing pads may also be constructed in extreme conditions such as on ice.
A portable helipad is a helipad structure with a rugged frame that can be used to land helicopters in any areas with slopes of up to 30 degrees, such as hillsides, riverbeds and boggy areas. Portable helipads can be transported by helicopter or powered-lift to place them where a VTOL needs to land, as long as there are no insurmountable obstructions nearby.
Such a aircraft may have telescopic legs that help maintain level flight in any terrain. The telescopic legs have sensitive sensors which detect the terrain and, when landing, the data from the sensors are sent, preserved and interpreted in real-time by the aircraft. So, the pilot can land it at the site safely and unload the cargo which can set up a portable helipad.
Portable helipads are useful for rescue teams during floods, mountain rescues, avalanche rescues, government teams for mountain operations, combat operations for defense, and oil and gas companies in gas transmission pipeline projects, mining industry etc. They are also used in the energy sector, constructing and servicing electrical transmission lines and terrestrial windmills. Portable helipads can be used on highways to land helicopters during medical emergencies.
Helipad atop the SunAmerica Center in Century City, California, USA
The main helipad at University Hospital Coventry in England
A helicopter touches down on a helideck on board the High Speed Vessel Swift
Bitexco Financial Tower Helipad, Ho Chi Minh, Vietnam
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- FAA Advisory Circular 150/5390-2B page 51
- Point Sonam Siachen
- Nick Easen (2003-09-17). "Siachen: The world's highest cold war". CNN. Retrieved 30 March 2009.
- Hodgkins, Kelly (2015-09-15). "DARPA GIVES HELICOPTERS INSECT-LIKE LEGS TO LAND ON UNEVEN SURFACES". DIGITAL TRENDS. DT PRESS. Retrieved 2017-01-01.
The data from the sensors is interpreted in real-time by the helicopter and used by the flight system to make adjustments, so as to avoid hitting the rotor on the landing area and maintain level flight. The legs add little additional weight to the aircraft and provide a tremendous amount of benefit by expanding its available landing terrain.
- "Portable heliport". 365Design. 365DESIGN. Retrieved 2017-01-01.
Portable Heliports can be used in Highways for Emergency Medical Services.
- "Portable Helipad". BNN Aviation, Helipad Heliport Experts. BNN Aviation. Retrieved 2017-01-01.
Portable heliports can be used in highways for emergency medical services.
- de Voogt, A.J. 2007. Helidrome Architecture. Rotterdam: 010 Publishers.
- ICAO 1995. Heliport manual. Montreal, Canada: ICAO Publications.