H175 Medium Twin-Engine Helicopter, France
The H175 medium-lift, twin-engine helicopter, formerly known as EC175, was developed by Airbus Helicopters.
It is suitable for search and rescue, law enforcement, emergency medical services, fire-fighting, border security, maritime patrol, utility and offshore missions. The H175 helicopter made its first flight in December 2009.
Airbus Helicopters received an order from Hong Kong-based Government Flying Services (GFS) for the supply of seven H175 helicopters in public services configuration in September 2015.
The first batch of three aircraft will be delivered in 2017, while the remaining four will be delivered in 2018.
Design and features of H175 helicopter
H175 multi-mission helicopter features an airframe, a five-blade main rotor unit and a three-blade tail rotor unit with SPHERIFLEX rotor head. It has an overall length of 18.5m, width of 14.79m and height of 5.34m. It can accommodate two crew members and up to 18 passengers.
The cockpit and nose avionics bay are placed in the front section of the fuselage and the cabin is located in the central part of the fuselage. The rear fuselage has a tail boom with pylon and horizontal stabilisers.
The 4m long, multi-purpose cabin has a flat floor and large sliding doors on both sides. Two tinted jettisonable acrylic windows are between the cockpit and cabin doors. The rotorcraft is also fitted with two lockable passenger sliding doors, each with two tinted jettisonable acrylic windows.
Cockpit and avionics
Pilot and co-pilot seats are equipped with a five-point harness for increased safety. The cockpit is fitted with two tinted upper windows, two lower windows, two windshield wipers and two lockable hinged pilot and co-pilot doors.
The Helionix avionics suite, integrated with an intuitive human-machine interface and a dual-duplex four-axis autopilot, provides improved mission flexibility and enhanced situational awareness, while reducing pilot workload. The flight management and navigation data is displayed on four reconfigurable 6in x 8in displays.
The cockpit is also integrated with a helicopter terrain awareness system (HTAWS) to prevent dangerous situations and a traffic alert collision avoidance system (TCAS II) for automatic collision avoidance.
The helicopter is used for a range of parapublic and police operations such as patrol, rescue, airborne surveillance, border protection and maritime surveillance.
Passenger safety is ensured by a maritime anti-corrosion protection system, crash protection features, retractable tricycle energyabsorbing landing gear, emergency floatation devices, and large windows.
Power plant and performance of H175
The power plant consists of two Pratt & Whitney PT6C-67E turboshaft engines, a fuel system and two anti-icing fuel systems. Each engine is equipped with a full-authority digital engine control (FADEC) system and generates a thermodynamic power output of 1,775shp.
Main components of the transmission system are one main gearbox, one splash lubricated intermediate gearbox, one splash lubricated tail gearbox and one rotor brake system.
The helicopter has a maximum take-off weight of 7.5t and a standard fuel tank capacity of more than 2t. The H175 has a recommended cruise speed of 150kts and can reach a maximum cruise speed of more than 165kt. It has a hover out of ground effect (HOGE) ceiling of 5,800ft and can endure for up to six hours.
For search-and-rescue missions, the H175 helicopter can be configured with search and weather radars, operator console, oversized bubble observer windows, cabin-mounted medical equipment, side-mounted searchlight, up to six under-fuselage lights and an external winch.
The public services version is fitted with loud-speaker hailers, searchlight, dual hoists and steerable external lighting. It also features an inbuilt electro-optical system for observation and tracking.
H175 can be configured to carry 16 passengers in oil and gas missions and can travel to a maximum distance of 140nm. The VIP version accommodates between six and eight passengers, whereas the executive variant can transport between nine and 12 passengers.