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The NAMC YS-11

Country of origin  
Japan

Photos  

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Photo © Edward Lai

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Photo © M Radzi Desa
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Photo © Yunjin Lee - Korea Aero Photos
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Powerplants  
YS11A200 - Two 2280kW (3060shp) RollsRoyce Dart 54210K turboprops driving four blade constant speed propellers.

Performance  
200 - Max cruising speed 470km/h (253kt), economical cruising speed 452km/h (244kt). Range with max payload and no reserves 1090km (590nm), range with payload and no reserves 3215km (1736nm).

Weights  
200 - Operating empty 15,419kg (33,993lb), max takeoff 24,500kg (54,010lb).

Dimensions  
Wing span 32.00m (105ft 0in), length 26.30m (86ft 4in), height 8.98m (29ft 6in). Wing area 94.8m2 (1020.4sq ft).

Capacity  
Flightcrew of two. Typical single class seating in main cabin for 60 at four abreast and 86cm (34in) pitch. The combi YS11A300 accommodates freight in the forward portion of the main cabin with seating for 46 behind that.

Production  
182 YS-11s built comprising two prototypes, 48 series 100s, 83 Series 200s, 31 series 300s, eight series 400s, two series 500s and eight series 600s. Production total includes 23 for Japanese military. 66 remained in service at late 1998.

Type  
Twin turboprop regional airliner

History  

The only Japanese airliner to enter production since WW2, the YS-11 achieved a degree of success in its domestic market and in North America.

The YS-11 was a product of the Nihon Aircraft Manufacturing Company (or NAMC), a consortium of Fuji, Kawasaki, Mitsubishi, Nippi, Shin Meiwa (now Shin Maywa) and Showa. NAMC formed on June 1, 1959 to design and develop a short to medium range airliner, with particular attention being paid to meeting the specific operating requirements of the Japanese domestic airlines.

NAMC selected the Rolls-Royce Dart over the Allison 501 to power the new airliner. Fuji was given responsibility for the tail unit, Kawasaki the wings and engine nacelles, Mitsubishi the forward fuselage and final assembly, Nippi the ailerons and flaps, Shin Meiwa the rear fuselage and Showa the light alloy honeycomb structural components.

The YS-11 first flew on August 30 1962 (a second prototype flew that December), and was awarded Japanese certification in August 1964. By that time the first production aircraft were under construction, and the type entered service with Toa Airways (now JAS) in April 1965. Initial production was of the YS-11-100, the follow up YS-11A-200 (first flight November 1967) was designed for export markets and featured an increased max takeoff weight. The YS-11A-300 was a combi passenger/freight model, while the YS-11A-400 was a pure freighter with a forward freight door.

The YS-11A-500, -600 and -700 were equivalent to the -200, -300 and -400, but with a 500kg (1100lb) greater max takeoff weight. Production ceased in February 1974.

By late 1998, 66 YS-11s remained in commercial service. The largest operators were All Nippon (6) and Japan Air Commuter (12).

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The backbone of this section is from the The International Directory of Civil Aircraft by Gerard Frawley and used with permission. To get your own copy of the book click here.