Short-to medium-range commercial transport. Aerodynamic prototype of One-Eleven 475 flown August 27, 1970 followed by first production model on April 5, 1971, with certification and first production deliveries following in June. Total of 215 examples of all versions of the Ono Eleven ordered by beginning of 1975.
The One-Eleven 475 combines the standard fuselage of the Series 400 with the redesigned wing and uprated engines of the Series 500 (see 1970 edition), coupling these with a low-pressure undercarriage to permit operation from gravel or low-strength sealed runways. The One-Eleven prototype flew on August 20, 1963, production models including the physically similar Series 200 and 300 with 10,330 lb (4 686 kg) Spey 506s and 11.400 lb (5 170 kg) Spey 511s. the Series 400 modified for US operation, and the Series 500 which is similar to the 475 apart from the fuselage and undercarriage.
| Country of origin | United Kingdom |
| Power Plant | Two 12.550 lb (5 692 kg) Rolls-Royce Spey 512 14-DW turbofans. |
| Performance | Max. cruise. 548 mph (882 km/h) at 21,000 ft (6 400 m) |
| econ cruise. 507 mph (815 km/h) at 25,000 ft (7 620 m) | |
| range with reserves for 230 mls (370 km) diversion and 45 min, 2,095 mls (3 370 km), with capacity pay-load. 1.590 mls (2 560 kg) | |
| Initial climb rate at 345 mph (555 km/h), 2,350 ft/min (11,93 m/sec) | |
| Weights | Basic operational, 51,814 lb (23 502 kg): max. take off. 92,000 lb (41 730 kg) |
| Accommodation | Basic flight crew of Iwo and up to 89 passengers. Typical arrangement provides for 16 first-four-abreast) and 49 tourist-class (five-abreast) passengers. |
| Dimensions | Span. 93 ft 6 in (28,50 m) |
| Length, 93 ft 6 in (28.50 m) | |
| Height. 24 ft 6 in (7.47 m) | |
| Wing area, 1.031 sq ft (95,78 m2) |
