Learjet 28

From Wikipedia, the free encyclopedia
  (Redirected from Learjet 28/29)
Jump to: navigation, search
Learjet 28/29
Fig028.jpg
Role Business jet
Manufacturer Learjet
First flight August 24, 1977
Retired NASA
Status Retired
Produced 1977-1982
Number built 5
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.[1]

History[edit]

The first flight of the Learjet 28 took place on August 24, 1977. FAA certification was awarded to both models on July 29, 1979.[2]

The Learjet 28/29 was the first production jet aircraft to utilize winglets[citation needed] (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which resulted in improved performance and fuel economy.[1] Both models were commercially unsuccessful due to their outdated engines[citation needed] (noise and fuel consumption being too high).

Only five production LearJet 28s, and four LearJet 29s, were constructed before production ceased in 1982. Both types were subsequently replaced by the Learjet 35.[1]

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.

Operators[edit]

 United States

Specifications (Learjet 28)[edit]

Data from Jane's Civil and Military Aircraft Upgrades 1994–95[3]

General characteristics

  • 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)
  • 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

Performance

  • Maximum speed: 549 mph (884 km/h; 477 kn)
  • Cruise speed: 470 mph (408 kn; 756 km/h) ,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 (15,545 m)

See also[edit]

Related development
Related lists

References[edit]

Notes
Bibliography
  • Michell, Simon. Jane's Civil and Military Aircraft Upgrades 1994-95. Coulsdon, UK:Jane's Information Group, 1994. ISBN 0-7106-1208-7.

External links[edit]