The 5670kg gross weight limit to which the Lear Jet 23 had been developed proved in practice to be an unnecessary constraint. Most operators were already using two-man crews and, subsequently, CAB licensing requirements for low-capacity jet aircraft were eased. This allowed Lear to take advantage of the basic strength of the design to develop a new version, to FAR.25 standards, with a gross weight of 6123kg. Announced in October 1965, the Learjet 24 introduced among other improvements increased cabin pressurisation for operation at higher altitude. The first Learjet 24 was flown on 24 February 1966 and gained certification the following month. In 1967 Bill Lear's holdings in Lear Jet Corporation were acquired by the Gates Rubber Company. As a result, in January 1970 the Lear Jet Corporation was renamed the Gates Learjet Corporation. A year earlier the company had started delivery of a new Learjet 24B, differing primarily by having uprated 1338kg thrust General Electric CJ610-6 engines. A lighter-weight Learjet 24C was then under development, but this was abandoned in December 1970 in favour of the Learjet 24D. This offered greater range as a result of increased fuel capacity and certification for operation at a higher gross weight. It was recognisable externally by deletion of the non-structural bullet at the junction of the horizontal and vertical tail surfaces and by having square instead of oval cabin windows. A Model 24D/A was also available with take-off weight restricted to 5669kg.
In 1976 these two versions were superseded by the Learjet 24E and Learjet 24F, introducing a new cambered wing and aerodynamic improvements to reduce stall and approach speeds. Although the two models were
generally similar, the Learjet 24F differed by having almost 18 per cent greater fuel capacity. Production of the Learjet 24E was terminated during 1979, and that of the Learjet 24F during 1980, 258 model 24s having been built.
|A three-view drawing (1280 x 650)|
| MODEL||Learjet 24F|
| ENGINE||2 x General Electric CJ610-8A turbojets, 1338kg|
| Take-off weight||6123 kg||13499 lb|
| Empty weight||3204 kg||7064 lb|
| Wingspan||10.85 m||36 ft 7 in|
| Length||13.18 m||43 ft 3 in|
| Height||3.73 m||12 ft 3 in|
| Wing area||21.53 m2||231.75 sq ft|
| Max. speed||880 km/h||547 mph|
| Cruise speed||793 km/h||493 mph|
| Ceiling||15545 m||51000 ft|
| Range||2731 km||1697 miles|
|Scott Boyd, 18.03.2012|
The 24 always flew like a 24, the 25 was the same but different, 757/767 is done every day at American, I believe and a Lear type is good for any Lear.
None of the wing changes changed the way it flew but did improve performance and range. The Raisback wing added some fuel and could go faster, but nothing else was different.
I never had a hint of a mechanical problem and in school they taught the engine fire system, but stressed it had never actually been used so it's operation was still only theoretical.
|joe bickett, 16.03.2012|
am curious what the Century III wing did for performance. gracias
|tampa buckeye, 15.02.2012|
We have a lear 24 at my school national aviation academy in clearwater fl.
|carlos miranda, 19.07.2011|
Durante 25 años volé Lears jet, 23-24 -25- 35 -31 y 60,todos excelentes aviones,el que mas recuerdo por sus condiciones,seguridad y perfomance fue el 24,con el fui a la guerra de MALVINAS,jamas imaginé que pudiese soportar las exigencias a las que fue sometido este maravilloso avión (serial Nº240),gracias a el estoy vivo y tengo el mejor de los recuerdos!!.Saludos!!
|Ray Callahan, 06.02.2011|
I flew the 24D and 25D for about four years. The 24 was my favorite. It was modified with the D Howard Mark II wing and had -8 engines. Man was that airplane a rocket. 6000 FPM was the norm for that airplane. I have seen 10,000 FPM to 21,000. You either had to power back after takeoff or you would exceed 250 KTS or scare the heck out of your passengers. It was a gas hog though. About two hours and 45 minutes was all you wanted to fly or run the risk of running out of fuel. It loved 45,000 and yes, you can just begin to see the curvature of the earth. There is a Lear Jet 24 at the Dullis Smithsonian hanging from the ceiling. Don't know anything about it. The 24 with the Mark II wing was a wonderful handling airplane. But you had to fly it by the book and then add a little speed. Flying at V-rev on approach is a no no. Do it and it will scare the heck out of you if you have any fuel in the tip tanks. Ref+20 until short final and then ref+10 over the threshold and it will make the prettiest landing you have ever seen. Approach at 210 and then slow to 170 until the outer marker and it is so stable that you can loose one engine and never know it. It's probably the best flying jet airplane I have ever flown and I also flew Hawker 700's and 800's and Citations. The Lear Jet is hands down the best airplane I have ever flown and there are some really good airplanes out there. Man I miss flying the Lear 24D.
|john davis, 18.12.2010|
I flew the LR23A (12,499 MGW) back in 1972-73. Closest thing to a civilian rocket ship I ever flew. On my type ride, "Red Fred" (for those of you Lear pilots around KCMH, asked for a single engine g/a and the ROC needle pegged on 6000! The CJ610 "straight pipe" engine was fantastic...hell of a ship and nothing like it to this day!
|Scott Boyd, 26.01.2010|
I flew the 24D and E some but mostly the 25D. The 24 was a much better hand flying aircraft, the 25 was a lot touchier. The 24E could get to 510 feet pretty easily, but it didn't carry enough fuel to stay very long. The guide vane change on the engines limited them to 450 after only a couple of years.
The 28-29 can get to 510 and most had the engines modified.
|marvin owens, 27.12.2009|
When i was in the u.s.army in 1965 i flew in a private miltary jet it flew at 51k feet i saw the curvature of the earth. i tell people about this. no one believes me. is this the same aircraft i flew in as a young man? is 51k the begining of outerspace. i here that they have it on display somewher in the unitedstate. i want to take my grandchildren to see this. thanks for all your help. marvin
i want to know about lear24D
Do you have any comments about this aircraft ?