Learjet 24

Infobox Aircraft
name = Learjet 24



caption = NASA Learjet 24
type = Business jet
manufacturer = Learjet
designer =
first flight = January 24, 1966
introduced =
retired =
status =
primary user = Private
more users = Military
NASA
produced =
number built = 210
unit cost =

The Learjet 24 is an American six to eight seat (two crew and four to six passengers) twin-engined, high speed business jet. Manufactured by Learjet as the successor to the Lear Jet 23.

History

Wikify|date=August 2007The original Lear Jet 23 was designed not to exceed a gross weight of 12,500lb (5670 kg) and it was soon realised that this limit was not needed and a higher gross weight version was developed as the Learjet 24. The aircraft was designed to meet FAR Part 25 Regulations with a gross weight of 13,500 lb (6123 kg). It was announced in October 1965. It also introduced other improvements including increased cabin pressurisation (to allow a higher operating altitude). One of the obvious differences is the addition of one extra window on each side of the cabin. Improved engines were installed and some small changes were made, in order to meet the requirements of FAR Part 25 regulations (the LJ24 was the first business jet to be certified under Part 25). [http://www.wingsoverkansas.com/history/article.asp?id=199 Learjet company timeline] ] In addition there was a new windshield, the auxiliary fuel in wing tip tanks and a fire-extinguishing system for the engines. The first flight of a Learjet 24 took place on January 24, 1966. Different variants were the 24A, B, C, D, E and F, with changes of takeoff weight, range, cabin and engines.

From May 23 to May 26, 1966, a Learjet 24 flew around the world in 50 hours, 20 minutes' flying time as a demonstration of its capabilities.

Altogether 259 Model 24s were built, and in 2001, there were still 210 Learjet 24s in use. Altogether 39 LJ24s had been lost through accidents.

Variants

Learjet 24A

Standard version. Converted from existing Learjet 23. Takeoff weight 5902 kg. FAA certified on November 9, 1966. 81 aircraft built.

Learjet 24B

Improved variant with 2x General Electric CJ610-6 and 6129 kg maximum takeoff 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. Takeoff weight 5675 kg. None built.

Learjet 24D

Similar to Learjet 24C, however by changing surface tanks range and takeoff weight were increased 6129 kg. Round cabin windows replaced by angular. FAA certified July 17, 1970. Replaced the 24B in production. A reduced gross weight (restricted to 12,500lb (5669 kg) version was also available (the 24D/A). 99 built.

Learjet 24E/F

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. The 24E was had an additional fuel tank to give an 18% greater fuel capacity. Powered by two General Electric CJ610-8A. On April 15, 1977, the FAA approves extended ceiling to 51,000 feet (15,545 m), the highest level then achieved in civilian aviation. 29 aircraft built.

pecifications (Learjet 24E)

aircraft specifications
plane or copter?= plane
jet or prop?= jet
ref={name of first source}
crew= Two (pilot & co-pilot)
capacity=5 passengers
length main=
length alt=
span main=
span alt=
height main=
height alt=
area main=
area alt=
airfoil=
empty weight main=
empty weight alt=
loaded weight main= 7,830 lb
loaded weight alt= 3,600 kg
useful load main=
useful load alt=
max takeoff weight main= 13,500 lb
max takeoff weight alt= 6,136 kg
more general=
* Cabin Height: 4 ft 4 in (1.32 m)
* Cabin Width: 4 ft 10 in (1.47 m)
* Cabin Length: 9 ft (2.74 m)
* Cabin Volume: 192 ft³ (5.4 m³)
* Door Height: 4 ft 3 in (1.3 m)
* Door Width: 3 ft (0.91 m)
* Baggage Volume Internal: 40 ft³ (1.13 m³)
engine (jet)= General Electric CJ610-6
type of jet=turbojet engines
number of jets=2
thrust main=
thrust alt=
thrust original=
afterburning thrust main=
afterburning thrust alt=

max speed main= 475 knots
max speed alt= 546 mph, 886 km/h
cruise speed main= 439 knots
cruise speed alt= 505 mph, 819 km/h
never exceed speed main=
never exceed speed alt=
stall speed main=
stall speed alt=
range main= 1,100 NM
range alt= 1,266 mi, 2,052 km
ceiling main= 45,000 ft at Maximum Weight
ceiling alt= 13,720 m
climb rate main= 6,800 ft/min
climb rate alt= 2,073 m/min
loading main=
loading alt=
thrust/weight=
power/mass main=
power/mass alt=
more performance=
* Long Range Cruise Speed: 410 knots (472 mph, 765 km/h)
* Range - Seats Full: 850 NM (978 mi, 1,585 km)
* One Engine Inoperative Service Ceiling at Maximum Weight: 28,500 ft (8,690 m)
* Rate of Climb - One Engine Out: 2,100 ft/min (640 m/min)
* Balance Field Length: 4,300 ft (1,311 m)
* Landing Distance (Factored): 5,325 ft (1,623 m)
* Maximum Landing Weight: 11,880 lb (5,400 kg)
* Usable Fuel: 5,628 lb (2,558 kg)
* Payload with Full Fuel: 342 lb (155 kg)
* Maximum Payload: 3,570 lb (1,622 kg)
armament=
avionics=

References

* [http://www.airwar.ru/enc_e/aliner/ljet24.html Specs of LJ24]
* [http://de.wikipedia.org/wiki/Learjet_24 History from LJ24 on German Wikipedia]

External links

* [http://www.airliners.net/info/stats.main?id=264 A history of the LJ23-LJ29 series on Airliners.net]
* [http://aviation-safety.net/database/dblist.php?Type=LJ-24 Listing of LJ24 accidents in ASN Aviation Safety Database]

ee also

*The 1988 Mexico Lear 24 crash

Related content

aircontent
related=
similar aircraft=
sequence=
LJ23 - LJ24 - LJ25 - LJ28 - LJ29
lists=
List of aircraftLearjet