Learjet 25

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Learjet 25

NASA Learjet 25
Type	Business jet
Manufacturer	Learjet
Maiden flight	August 12, 1966
Introduced	November 1967
Primary users	Private Military NASA

The Learjet 25 is a ten seat (two crew and eight passengers) twin-engined, high speed business jet. Manufactured by Learjet as the successor to the Learjet 24.

1 History
2 Specifications (LJ25 Model B)
3 References
4 External link
5 Related content

[edit] History

The first Model 25 flew on 12 August 1966 and the first delivery was in November 1967.

The Learjet 25 is similar to the Model 24 but is 1.27 m (4 ft 2 in) longer, allowing for three additional passengers. In 1970 the Learjet 25B was produced along with the Learjet 25C in the same year.

The aircraft has two General Electric CJ610-6 (or CJ610-8) turbojet engines. The landing gear is of the retractable, tricycle type with a steerable nosewheel. The aircraft usually comes with a refreshment cabinet and under the seat opposite is sometimes a toilet. Baggage is stowed in a compartment at the rear of the cabin.

In 1974 the Peruvian Air Force purchased two 25B's with a belly pod that contained an aerial survey camera. Since then there have been several civilian versions sold. The cabin interior can be converted to several different configurations to allow for cargo and medevacs. The Model 25C also has an optional two bed sleeping compartment.

Due to the ease of converting the cabin the Learjet 25 has found a niche as a medevac aircraft. This is achieved by removing the starboard seating to allow for a stretcher, mounting oxygen bottles and Intravenous drip equipment. The two flight crew are then supplemented by either a doctor or flight nurse or both. Despite being used at lower altitudes and equipped with small landing gear, the Learjet can land on gravel runways if it is fitted with a special 'gravel kit'. It is possible for gravel from an improperly packed gravel runway to be sucked into the engines causing "Foreign object damage".

Learjet 25 (C-GBFP) registered to Adlair Aviation at Cambridge Bay Airport, Nunavut, Canada. This aircraft is fully equipped for medevac flights.

The Lear 25, like the Learjet 23 and 24, has a single spool turbojet engine - which makes it too loud to meet the globally widespread stage III noise requirements. Because of this, all the 20 series Learjets are relatively inexpensive, priced at around $500,000 (Used) United States dollars or less. The 30 series LearJets - and on - with the Garret 731 two spool engines are much quieter but cost more.

The ICAO designator as used in flight plans for all Learjet 25 models is LJ25.

[edit] Specifications (LJ25 Model B)

General characteristics

Crew: Two pilots
Capacity: 8 passengers
Length: 47 ft 7 in (14.5 m)
Wingspan: 35 ft 7 in (10.84 m)
Height: 12 ft 3 (3.73 m)
Wing area: 231.77 ft² (21.53 m²)
Empty weight: 8,223 lb (3,730 kg)
Loaded weight: 7,755 lb (3,517 kg)
Max takeoff weight: 15,500 lb (6,803 kg)
Powerplant: 2× General Electric CJ610-6 or CJ610-8 turbojets, () each

Performance

Maximum speed: 545 mph (473 knots, 877 km/h) at 41,000 ft (12,500 m)
Range: 1,770 mi (1,540 nm, 2,853 km) with seven passengers, maximum fuel, and 45 minute reserve
Service ceiling: 45,000 ft (13,720 m)
Rate of climb: 6,050 ft/min (30.7 m/s)
Wing loading: 64.7 lb/ft² (315.9 kg/m²)