The ShinMaywa US-2 is a large Japanese short takeoff and landing amphibious aircraft that employs boundary layer control technology for enhanced STOL and stall suppression performance. Manufactured by seaplane specialist ShinMaywa (formerly Shin Meiwa), it was developed from the earlier Shin Meiwa US-1A seaplane, which was introduced during the 1970s. The ShinMaywa US-2 was developed on behalf of the Japan Maritime Self-Defense Force (JMSDF) as a 'like-for-like' replacement for its aging US-1A fleet. In Japanese service, it is operated in the air-sea rescue (ASR) role. The US-2 can also be used in other capacities, such as an aerial fire fighter, carrying 15 tonnes of water for this mission. Various overseas operators have held discussions on potential acquisitions of the type, including the Indian Navy and Indian Coast Guard. Other countries such as the United States, Indonesia, Thailand, and Greece have also shown interest in the US-2 for various purposes. During 1969, the Japan Maritime Self-Defense Force (JMSDF) issued a production order to Japanese seaplane manufacturer Shin Meiwa for a group of 21 anti-submarine aircraft, which were given the designation PS-1. The service had also opted to procure a variant of the type, designated US-1A, specifically for search-and-rescue (SAR). The US-1A was Japan's first amphibian - capable of being used on land and sea. During the 1990s when the US-1A fleet was beginning to show its age, the JMSDF attempted to obtain funding towards acquiring a replacement, but could not secure enough to develop an entirely new aircraft. Therefore, during 1995, ShinMaywa, as Shin Meiwa had been renamed (reportedly so that the name would be easier to pronounce for non-Japanese speakers) commenced work on a project to develop an upgraded and modernised version of the US-1A, initially referred to as the US-1A kai (US-1A 改 - meaning "improved US-1A"). This modified aircraft features numerous aerodynamic refinements over its predecessor, along with a pressurised hull, and the adoption of more powerful Rolls-Royce AE 2100 engines and electronic cockpit instrumentation. The JMSDF also listed various refinements for the amphibian, including improved handling while landing on water, better onboard patient transfer facilities, and improved search-and-rescue capabilities at sea. On 18 December 2003, flight testing of the type, which was subsequently designated as the US-2, commenced. During early 2007, ShinMaywa formally launched commercial production of the amphibian. Production is handled by several of Japan's aviation companies. Mitsubishi manufactures the outer wing sections and the rear part of the engine nacelles, while NIPPI Corporation builds the watertight landing gear housings, and Kawasaki Heavy Industries produces the cockpit. Final assembly is performed by ShinMaywa around the US-2's hull. The production line only has the capacity to produce two aircraft at a time. During 2009, the first production US-2, which was outfitted for the search and rescue mission, was delivered to the Japan's Ministry of Defense. In 2010, ShinMaywa unveiled specifications for a civil fire-fighting variant of its US-2 amphibian. It began marketing the new variant to potential overseas customers that same year. The fire-fighting model replaces one fuel tank with a 15 tonne water tank, reducing its maximum range to 2,300 km (1,245 nm) compared with the SAR's 4,700 km range. The tank is durable enough for salt water, foam and fire retardant. Other features include a pair of water scoops for collecting water, automatic foam mixing equipment and a computer-controlled water drop system.
