Kawasaki C-1

The Kawasaki C-1 is a twin-engined short-range military transport aircraft developed and manufactured by Kawasaki Heavy Industries of Japan. Operated solely by the Japan Air Self-Defense Force (JASDF), it entered regular service in 1974 as an indigenous jet replacement for the Second World War-era Curtiss C-46 Commando. It formed the backbone of JASDF airlift into the 21st century and was retired in March 2025, replaced by the Kawasaki C-2.

Development

By 1966 the JASDF transport fleet consisted primarily of C-46s, and officials lobbied for a domestically designed replacement; the requirement was incorporated into the Third Defense Buildup Plan. The JASDF approached the Nihon Aircraft Manufacturing Corporation (NAMC), then producing the YS-11, and design work began in 1966. Following a design review, NAMC named Kawasaki Heavy Industries as prime contractor. Mitsubishi Heavy Industries built the tail section and the middle and rear fuselage, Fuji Heavy Industries most of the wings, Shin Meiwa the rudder, and NIPPI Corporation the flaps. The C-1 was the third indigenous postwar Japanese aircraft programme, after the Fuji T-1 and the YS-11. The XC-1 prototype first flew on 12 November 1970, with quantity production beginning the following year. Procurement was curtailed in favour of the C-130H — which entered service with the 401st Tactical Airlift Squadron in 1989 — partly because the C-1 could not fly directly to Okinawa from most of the home islands, and partly because of 1970s defence cutbacks. MITI briefly studied a commercial derivative before abandoning it in favour of collaboration on the Boeing 767.

Design

The C-1 is a twin-engine medium-range airlifter broadly resembling a scaled-down Lockheed C-141 Starlifter, powered by two Pratt & Whitney JT8D-M-9 low-bypass turbofans built under licence by Mitsubishi, each rated at 64 kN (14,500 lbf). A high-lift system comprising leading-edge slats and four-stage Fowler flaps provides short takeoff and landing performance, while electronic navigation equipment permits day, night and all-weather operation. Normal payload is 8,000 kg, and the type can carry 80 equipped troops, 45 paratroopers or 36 stretchers, plus vehicles such as a truck or two jeeps loaded through a rear ramp. Maximum speed is 806 km/h at 7,620 m, range 3,353 km with maximum fuel and a 2,300 kg payload, and maximum takeoff weight 38,700 kg. The crew numbers five: two pilots, flight engineer, navigator and loadmaster. The last five aircraft ordered received an additional 4,730-litre fuel tank.

Operational History

After about a year of flight testing, the two prototypes were handed to the JASDF for evaluation, and the type entered regular service in 1974. It equipped the 401st Tactical Airlift Squadron (1973–1989), the 403rd (1979–2018) and the 402nd, which flew it until the end. As of March 2022, seven C-1s remained in JASDF service; the last four airframes, including the EC-1 electronic-warfare trainer and the C-1FTB test aircraft, made their final flights between 12 and 14 March 2025, ending JASDF C-1 operations. Losses include two aircraft that struck a hill near Toba, Mie on 19 April 1983, killing 14; 58-1010, written off at Iruma Air Base on 18 February 1986; and one lost in the Sea of Japan on 28 June 2000 with five aboard. The National Aerospace Laboratory acquired one airframe as a research testbed.

Variants

• XC-1: Prototypes, first flown 12 November 1970.
• C-1/C-1A: Medium-range military transport production version.
• EC-1: Electronic warfare training aircraft.
• C-1FTB: Flight test bed used for trials of various equipment.
• Asuka/QSTOL: National Aerospace Laboratory quiet STOL research aircraft powered by four FRJ710 turbofans using upper-surface blowing and the Coandă effect, preserved at the Gifu-Kakamigahara Air and Space Museum.