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| Learjet 25 | |
|---|---|
| Name | Learjet 25 |
| Type | Twinjet business jet |
| Manufacturer | Learjet |
| First flight | 1966 |
| Introduced | 1967 |
| Produced | 1966–1982 |
| Status | Retired from production |
Learjet 25 The Learjet 25 is a twinjet business aircraft developed by Bill Lear's Learjet company during the 1960s. Noted for its high speed, high-altitude capability and use by corporate, military, and government operators, the type served alongside aircraft from Gulfstream Aerospace, Bombardier Aerospace, and North American Aviation. It competed with the Cessna Citation, Falcon 20, and Embraer Bandeirante families and influenced later designs such as the Canadair Challenger and Dassault Falcon 20.
The Learjet 25 traces its lineage to the prototype designs of Bill Lear and the earlier Cessna collaborations, evolving from the Model 23 into a stretched fuselage with increased fuel capacity and improved avionics to meet corporate needs including those of Howard Hughes era executives and airlines like Pan Am. The airframe featured a low-mounted wing with tip tanks, twin aft-fuselage-mounted turbofan engines derived from developments by General Electric and Rolls-Royce engine programs, and a pressurized cabin influenced by aerodynamic research at NASA and the U.S. Air Force testing facilities. Flight-control systems incorporated lessons from test programs at Edwards Air Force Base and certification required compliance with standards enforced by the Federal Aviation Administration and international authorities such as the European Union Aviation Safety Agency predecessor bodies. Avionics suites installed by suppliers including Honeywell, Collins Aerospace, and Garmin were later retrofitted in many airframes to meet evolving navigation and communication requirements tied to organizations like ICAO and IATA operational practices.
The Learjet 25 had a typical crew complement including a captain and first officer, with seating arrangements popular among corporations such as IBM, GE, and ExxonMobil for executive transport. Performance parameters measured during certification at facilities in coordination with NACA successors included cruise speeds near high subsonic ranges, service ceilings often quoted in relation to record flights involving aviators from Fédération Aéronautique Internationale-monitored events, and range figures relevant for routes flown by companies like AT&T and Lockheed Corporation. The aircraft’s typical specifications included twin turbofan engines producing thrust levels comparable to units supplied to types operated by Royal Air Force liaison squadrons, a maximum takeoff weight used in planning by airfields such as Teterboro Airport and Van Nuys Airport, and fuel capacities supporting transcontinental sectors between hubs like Chicago O'Hare International Airport and Los Angeles International Airport.
The Learjet 25 entered service with private operators, corporate flight departments, and governmental agencies including the United States Air Force's liaison units and various national law enforcement fleets. It was employed for medevac missions by medical centers associated with institutions such as Mayo Clinic and Cleveland Clinic, and for air ambulance work coordinated with organizations like Red Cross chapters. High-profile uses included transport duties for dignitaries connected to embassies accredited to capitals such as Washington, D.C., London, and Ottawa. Commercial charter operators including NetJets and regional firms patterned operational procedures after rules promulgated by FAA inspectors and airport operators at Miami International Airport and Le Bourget Airport. The type also saw adaptation for special missions by contractors working with NASA for calibration flights and by intelligence units tied to agencies historically based in cities such as Langley, Virginia.
Production variants expanded the model line to meet customer demands similar to how Boeing and Airbus offer multiple fuselage and range options. Corporate-customized interiors were fitted for clients including Rockefeller family offices and industrial conglomerates such as Siemens. Military adaptations paralleled conversions executed by defense contractors supplying avionics and sensors for roles used by units like the Mexican Air Force and the Swiss Air Force, reflecting patterns seen in conversions of business types by firms such as Lockheed Martin and Northrop Grumman.
Accident records for the Learjet 25 include several high-profile crashes investigated by agencies such as the National Transportation Safety Board and counterparts in other nations, with occurrences subject to scrutiny in legal proceedings held in jurisdictions including courts in Texas, Florida, and Ontario. Investigations often involved expertise from aircraft manufacturers and maintenance organizations like Bombardier, avionics suppliers, and airport authorities at sites like John F. Kennedy International Airport and Zurich Airport.
Primary civilian operators included corporate flight departments belonging to conglomerates such as General Motors, Boeing, and Shell, fractional ownership programs like NetJets, and charter carriers registered in countries with major hubs such as United Arab Emirates and Switzerland. Government and military operators encompassed air arms and ministerial flight departments from nations including United States, Mexico, Colombia, Sweden, and Pakistan, often operated by squadrons based at installations comparable to Trenton and Ramstein Air Base.
Surviving airframes are displayed in aviation museums and collections including institutions like the Smithsonian Institution National Air and Space Museum, regional museums such as the Museum of Flight in Seattle, and preservation groups operating exhibits at venues like EAA AirVenture Museum. Examples also remain in flying condition with private collectors appearing at airshows including Paris Air Show, EBACE and Farnborough International Airshow.