Learjet 28

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]

Learjet 28/29
Role Business jet
Manufacturer Learjet
First flight August 24, 1977
Status Retired
Produced 1977–1982
Number built 9
Developed from Learjet 25
Developed into Learjet 31

History

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.[2]

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which resulted in improved performance and fuel economy.[1] Both models were commercially unsuccessful due to their outdated engines (noise and fuel consumption being too high).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 31.

The first production aircraft was used by Neil Armstrong to set five aerospace records.[3]

Noise compliance

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[4]

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)
  • 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

Performance

  • Maximum speed: 549 mph (884 km/h, 477 kn)
  • Cruise speed: 470 mph (760 km/h, 410 kn) ,econ cruise at 51,000 ft (15,545 m)
  • Stall speed: 103 mph (165 km/h, 89 kn)
  • Range: 1,309 mi (2,107 km, 1,137 nmi)
  • Service ceiling: 51,000 ft (16,000 m)
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gollark: So you think that the centristic political views here just happen to be exactly the right ones for modern civilisation's situation and others don't work?
gollark: Past societies have lasted hundreds of years with entirely different ones.
gollark: Again: the "centre" as it stands now is purely an artifact of what our present political climate looks like.
gollark: You could argue that only the current ones are stable, but this is visibly wrong.

See also

Related development

References
Notes
  1. A history of the LJ23-LJ29 series on Airliners.net
  2. "Learjet company timeline". Archived from the original on 2006-12-31. Retrieved 2007-01-08.
  3. Richardson, Joshua (5 August 2020). "Historic Learjet donated to Armstrong Air & Space Museum". Dayton 24/7 Now. Retrieved 7 August 2020.
  4. Michell 1994, pp. 317–318.
Bibliography
  • 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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