|First flight||August 24, 1977|
|Developed from||Learjet 25|
|Developed into||Learjet 31|
The Learjet 28 is an American eight-to-ten-seat (two crew and six to eight passengers), twin-engine, high-speed business jet, intended to be the successor to the Learjet 25. The Learjet 29 is identical except for the addition of a long-range fuel tank, resulting in the reduction of the capacity to six (two crew and four passengers). Both were manufactured by Learjet and were marketed under the Longhorn name.
The first flight of the Learjet 28 took place on August 24, 1977. FAA certification was awarded to both the Learjet 28 and 29 on July 29, 1979.
The Learjet 28/29 was the first production jet aircraft to utilize winglets (entering service in 1977).
The Learjet 28/29 was based on the Learjet 25, and received a completely new wing fitted with winglets which resulted in improved performance and fuel economy. Both models were commercially unsuccessful due to their outdated engines (noise and fuel consumption being too high).
In 2013, the FAA modified 14 CFR part 91 rules to prohibit the operation of jets weighing 75,000 pounds or less that are not stage 3 noise compliant after December 31, 2015. The Learjet 28 is listed explicitly in Federal Register 78 FR 39576. Any Learjet 28s that have not been modified by installing Stage 3 noise compliant engines or have not had "hushkits" installed for non-compliant engines will not be permitted to fly in the contiguous 48 states after December 31, 2015. 14 CFR §91.883 Special flight authorizations for jet airplanes weighing 75,000 pounds or less – lists special flight authorizations that may be granted for operation after December 31, 2015.
Specifications (Learjet 28)
Data from Jane's Civil and Military Aircraft Upgrades 1994–95
- Crew: 2
- Capacity: 8 passengers
- Length: 47 ft 7 in (14.51 m)
- Wingspan: 43 ft 10 in (13.35 m)
- Height: 12 ft 3 in (3.73 m)
- Wing area: 264.5 sq ft (24.57 m2)
- Airfoil: NACA 64A109
- Empty weight: 8,267 lb (3,750 kg)
- Gross weight: 15,000 lb (6,804 kg)
- Powerplant: 2 × General Electric CJ-610-8A turbojet, 2,950 lbf (13.1 kN) thrust each
- Maximum speed: 549 mph (884 km/h; 477 kn)
- Cruise speed: 470 mph (756 km/h; 408 kn) ,econ cruise at 51,000 ft (15,545 m)
- Stall speed: 103 mph; 89 kn (165 km/h)
- Range: 1,309 mi (1,137 nmi; 2,107 km)
- Service ceiling: 51,000 ft (16,000 m)
- A history of the LJ23-LJ29 series on Airliners.net
- "Learjet company timeline". Archived from the original on 2006-12-31. Retrieved 2007-01-08.
- Michell 1994, pp. 317–318.
- Michell, Simon. Jane's Civil and Military Aircraft Upgrades 1994–95. Coulsdon, UK:Jane's Information Group, 1994. ISBN 0-7106-1208-7.
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