The MH-90 is based on the McDonnell Douglas twin-turbine MD 900 Explorer, changed for air-sea rescue and police work. With the biggest functional cabin in its light-twin category, the MD Explorer's cabin size equals that of medium-twin class helicopters. Integrated optional avionic systems are simply accessible. massive 52-inch (1.32 m) cabin door openings on each side of aircraft enable unrestricted ingress/egress.
The MH-90s are equipped with a spread of lethal and non-lethal weapons. the main armament of the MH-90s consists of a M240G machine gun plus a 50-caliber sniper rifle equipped with a laser sight. The machine gun's primary purpose is to fire warning shots across the path of fleeing go-fasts, while the sniper rifle is employed to selectively target and disable the engines of the go-fasts as necessary. other non-lethal armament consists of stun grenades and entangling nets among other items of equipment.
The MH-90s are also equipped with armor plating, a camera system mounted on a gyro-stablilzed fitting, a night-vision compatible cockpit, a GPS-based navigation system, and Forward-looking InfraRed (FLIR). additionally, a deployable flotation system has been fitted due to the units operations over open water. The communications suite of the MH-90 includes HF/VHF/UHF radios capable of operating in each the secure and clear modes.