The Learjet 24 is an American six-to-eight-seat (two crew and four to six passengers) twin-engine, high-speed business jet, which was manufactured by Learjet as the successor to the Learjet 23.
Learjet 24B registered in France and operated by a corporate owner. Athens Airport 1973
The Learjet 24 was designed as an improved version of the Learjet 23, which was limited to 12,500 pounds (5,700kg) gross weight. Engineers designed the model 24 to accept up to the full 13,500 pounds (6,100kg) gross weight permitted by FAR-25 standards.
Other improvements introduced in the Learjet 24 included:
increased cabin pressurization, to allow a higher operating altitude
the addition of one extra window on the right side of the cabin
more powerful engines
a new windshield
auxiliary fuel in wing tip tanks
a fire-extinguishing system for the engines
With these changes, the LJ24 became the first business jet to be certified under FAR-25.[1]
The first flight of a Learjet 24 took place on January 24, 1966. From May 23 to 26, 1966, a Learjet 24 flew around the world in 50 hours and 20 minutes flying time as a demonstration of its capabilities.[1]
Different variants were the 24A, B, C, D, E and F, with changes of takeoff weight, in-fuselage fuel tank, range, cabin and engines.
Altogether 259 Model 24s were built, and in 2001, there were still 210 Learjet 24s in use. Thirty-nine LJ24s have been lost through accidents.
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 24 is listed explicitly in Federal Register 78 FR 39576. Any Learjet 24s 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.
Variants
Learjet 24A
Standard version. Converted from existing Learjet 23. Takeoff weight 13,499 pounds (6,123kg). FAA certified on November 9, 1966. 81 aircraft built.
Learjet 24B
Improved variant, powered by two 2,950lbf (13.1kN) thrust General Electric CJ610-6 turbojet engines, and 13,499 pounds (6,123kg) maximum take-off weight. FAA certified December 17, 1968. 49 aircraft built.
Learjet 24C
A light-weight version of the 24B, fuselage tank not fitted which would have caused a reduction in range. The Learjet 24C project was abandoned in December 1970. Take-off weight 5,675 kilograms (12,511lb). None built.
Learjet 24D
Similar to Learjet 24C, however by changing surface tanks range and takeoff weight were increased to 6,129 kilograms (13,512lb). Round cabin windows replaced by angular. FAA certified July 17, 1970. Replaced the 24B in production.[1] A reduced gross weight (restricted to 12,500 pounds (5,700kg) version was also available (the 24D/A). 99 built.
Learjet 24D/A
Light-weight version with a restricted take-off weight of 5,669kg (12,500lb).
Learjet 24E and 24F
Two new versions were announced in 1976 the 24E and 24F, they introduced a new cambered wing and aerodynamic improvements to reduce stall and approach speed (Century III wing). The 24E did not have a fuselage fuel tank for higher payload but shorter range. Some 24E models had the fuselage tank installed later to restore range. Powered by two 2,950lbf (13.1kN) thrust General Electric CJ610-8A turbojet engines. On April 15, 1977, the FAA approved extended ceiling to 51,000 feet (16,000m), the highest level then achieved in civilian aviation.[1] 29 aircraft built.
Operators
Mainly used by private individuals and corporations, one aircraft was used by NASA as the Lear Jet Observatory
Accidents and incidents
On January 6, 1977, Dolly Sinatra the mother of Frank Sinatra was one of four killed when Learjet 24 N12MK crashed into a mountain following a departure from Palm Springs Airport, United States.[citation needed][2]
163 - Learjet 24F on display at Lewis University in Romeoville, Illinois. Formerly owned by Arnold Palmer from 1968-1976. Donated to Lewis By Waste Management in 1986 for use by maintenance students in their Aviation Department.
3-view line art
Specifications (Learjet 24F)
Data from Jane's All The World's Aircraft 1976–77[14]
"Learjet Model 24D". Frontiers of Flight Museum. Frontiers of Flight Museum. Archived from the original on 29 November 2016. Retrieved 8 November 2016.
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