Gates Lear 31
The Model 31 was announced by Learjet in September 1987 and combines the fuselage, eight-passenger cabin and 3,500 lb st (15,6 kN) Garrett TFE731-2-2B turbofans of the Model 35A/36A with a longer span wing with winglets plus the prominent ventral strakes known as Delta-Fins.
The Learjet 31 aerodynamic prototype first flew on 11 May 1987 and the type was certificated by the FAA in August 1988. Able to carry seven passengers and two crew over ranges up to 3076km, the LJ31 can cruise at 15545m.
Four EFIS-equipped versions were ordered by Singapore Airlines specially configured for crew training (S/Ns 31-033, 31-033A, 31-033C, 31-033D). They were basically LR31's but with Honeywell EFIS and some of the vertical instruments out of the LR55, and had the ER fuselage tank.
By mid-1991, when the type was superseded by the Model 31A and 31A/ER, about 30 had been delivered. The Learjet 31A replaced the earlier aircraft on the Wichita production line in July 1991 and features an integrated digital avionics package, and can also be equipped with a braking parachute installed internally under the tail. The extended-range Learjet 31A/ER is a Model 31A with a higher maximum takeoff weight and able to carry extra fuel.
Engines: 2 x Garrett TFE731-2 turbofans, 1588kg
Max take-off weight: 7030 kg / 15499 lb
Empty weight: 4575 kg / 10086 lb
Wingspan: 13.3 m / 43 ft 8 in
Length: 14.8 m / 48 ft 7 in
Height: 3.7 m / 12 ft 2 in
Wing area: 24.5 sq.m / 263.72 sq ft
Cruise speed: 832 km/h / 517 mph
Ceiling: 15545 m / 51000 ft
Range: 3076 km / 1911 miles