- Aircraft History, Specification and Information -
Learjet 25
Learjet 25D - 5N-AOC - Gates Learjet 25
Learjet 25D 5N-AOC (sn 25D-322)
Photo taken Aug. 01, 2010 @ Aurora Municipal Airport, Chicago/Aurora, IL - USA (ARR / KARR)
Photo © Marcel Siegenthaler

The Learjet 25 is an American ten seat (two crew and eight passengers) twin-engined, high speed business jet aircraft. Manufactured by Learjet as a stretched version of the Learjet 24.

Development

The first Model 25 flew on August 12, 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. Baggage is stowed in a compartment at the rear of the cabin.

Operations

The cabin interior can be converted to several different configurations to allow for cargo and medevacs. 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. The Model 25C also has an optional two bed sleeping compartment.

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", thus the need for the kit.

In 1974 the Peruvian Air Force purchased two 25Bs with a belly pod that contained an aerial survey camera.

Variants

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

  • Learjet 25A
    FAA certified on October 10, 1967.
  • Learjet 25B
    Improved version. FAA certified on September 4, 1970.
  • Learjet 25C
    Improved version with greater fuel capacity. FAA certified on September 4, 1970.
  • Learjet 25D
    Longer-range version.
  • Learjet 26
    Unofficial designation of a Model 25 which was equipped with Garret AiResearch TFE731-2 turbofan engines for a developmental flight test program. The aircraft, N26GL, first flew with the engines on May 19, 1971. The success of the flights led to the development of the Model 35.
  • Learjet 25G
    Introduced September 23, 1980. During a series of demonstration flights lasting from June 9 to 18, 1982, the 25G broke a number of long-distance speed and fuel consumption records.

Military Operators

  • Argentina
  • Bolivia
    Bolivian Air Force
  • Ecuador
  • Mexico
    Mexican Navy
  • Peru
    Peruvian Air Force
  • United States
    NASA

Specifications (Learjet 25D)

General characteristics
Crew: Two pilots
Capacity: 8 passengers
Length: 47 ft 7 in (14.50 m)
Wingspan: 35 ft 7 in (10.84 m)
Height: 12 ft 3 in (3.73 m)
Wing area: 231.77 ft² (21.53 m²)
Empty weight: 7,640 lb (3,645 kg)
Max takeoff weight: 15,000 lb (6,804 kg)
Powerplant: 2× General Electric CJ610-6 turbojets, 2,950 lbf (13.1 kN) each

Performance
Cruise speed: 534 mph (464 knots, 859 km/h, Mach 0.81) at 41,000 ft (12,500 m)
Stall speed: 105 mph (91 knots, 169 mph)
Range: 1,767 mi (1,535 nmi, 2,853 km) with four passengers, maximum fuel, and 45 minute reserve
Service ceiling: 45,000 ft (13,715 m)
Rate of climb: 6,050 ft/min (30.7 m/s)

Last updated September 24, 2010
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Learjet 25".
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