XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0
XP GLJ Model 25 SE v3.0

XP GLJ Model 25 SE v3.0

GLJ25SE-V3-DL
US$59.95

NEW! The GLJ Model 25 Special Edition v3.0 is our most advanced, award-winning, study-level business jet simulator for Lockheed Martin® Prepar3D® v5/4.5 and Microsoft® Flight Simulator X.

This complex aircraft simulator features four fully animated VR-ready virtual cockpits, 23 different liveries, high resolution models and textures, hundreds of animations, over 60 sound effects, custom aircraft systems, full-3D integration of the most popular third-party GNS/GTN and radar, dynamic lights, a ground power unit, and a 330-page flight manual.


Offered at the special upgrade price of US$39.95 to registered users of version 2.0/2.1. Current users simply need to connect to their online account before adding the product to the shopping cart and the price will be adjusted automatically.

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Our Ultimate XP GLJ 20 Series Aircraft Simulator for Prepar3D® and FSX

This release contains many new features and improvements over the previous version, including four (4) new virtual cockpit configurations with retrofitted instrument panels, full 3D integration of the GNS 530 and GTN 650/750 from Reality XP and Flight1, full-3D integration of the Rex/Milviz WX Advantage weather radar from Rex Simulations, customizable gauges to display and control third-party GPS, radars and transponders, 13 new liveries in addition to the ones from version 2.1 (23 liveries in total), interior and exterior dynamic lights compatible with the latest versions of Prepar3D®, new interior/exterior textures, a fully-functional GPU (Prepar3D®), new pilots, and an updated 330-page flight manual.

Note: GNS/GTN navigation systems and radars are not included and must be purchased separately from third-party vendors/developers.

Available at:


What's new in version 3?


A Fighter in Civilian Clothing

Nicknamed "fighters in civilian clothing" because of their sleek design and amazing performance, the classic Learjet 20 Series aircraft were the first true executive jets and redefined business aviation during the 1960’s and 70’s, flying high above the weather at transonic speeds. Their capabilities earned them a place among the extreme aircraft, setting record after record. With the longer-range Gates Learjet Model 25D, from which this addon is inspired, came a longer cabin, increased seating capacity, more flexible loading options, greater fuel capacity and a rather sleek-looking stretched fuselage.

Compared to flying other business jets, the Lear 25 gives you a thrill similar to racing a performance sports car and leaving all other competitors way behind. It is fast, slim, sexy, comfortable and capable of maneuvers you would never attempt with another civilian aircraft. According to some real-world pilots, its performance as a general aviation business jet is simply unequaled, even by today’s standards!

A Unique Addon for your Hangar

The Xtreme Prototypes GLJ Model 25 SE is a next generation addon optimized for the latest versions of our favorite simulation platforms and designed to take advantage of the new and more powerful gaming computers and video cards that are available today. It is a complex aircraft simulator that features high resolution models and textures, hundreds of animations, over 60 sound effects, dynamic light effects, custom aircraft systems and full-3D VR-ready virtual cockpits that make this addon an ideal candidate for new virtual reality devices and applications.

Nothing was spared in our efforts to reproduce the different instrument panels, carefully modeling and animating each mechanical device with all the necessary moving parts. Except for the LCD screens and the new radio's VFD displays, no flat 2D gauges are used in this model. Everything you see on your computer screen is in full 3D!

The result is a unique addon that strives to bring you not only the actual feeling of flying a high performance aircraft now equipped with modern avionics but also the spirit of maneuvering such a vehicle at a time when LCD screens and powerful computers didn't exist and pilots needed to know how to fly and navigate with minimal resources and rely on their own experience, abilities and judgment.

For the general aviation desktop pilot, being able to hop between small regional airports while passing airliners along the way is quite a thrill, but for the serious IFR enthusiast, we are confident this package will provide years of flying pleasure. Even if there are some differences between this addon and the real aircraft, nearly all systems, instruments, switches and knobs are fully functional in order to simulate complete procedures, from cold and dark to shutdown.

Designed by Users for Users

At Xtreme Prototypes, we consider our addons as real micro aircraft simulators rather than just games. Our products take months if not years to develop and test by a dedicated and passionate team of artists, technicians and pilots. We pay attention to every detail and we do our best to make sure that we provide our users with the best flight simulation experience they can get within the limitations of the current simulation platforms.

Becoming one of our users makes you an important member of our development team. Version 3.0 of our GLJ Model 25 SE addon is the product of the many ideas, comments and suggestions we received from serious computer pilots like you, from around the world. We wish to express our gratitude to all our users, followers, reviewers, test pilots, ex-Learjet employees, partners and friends for their contribution to the making and the success of this extreme aircraft simulator. Thank you for your sustained interest and continuous support!


Download the Manual

Download the full 330-page flight manual
(132 MB, PDF format)

Manuals are updated frequently, make sure you have the latest version.


What you Need to Know

  • GNS, GTN, radars and special transponder addons are not included and must be purchased separately from third-party vendors/developers.
  • Some software features available in the native Prepar3D® version may not be available in the FSX versions due to software limitations in FSX.
  • You must accept the end-user license agreement before you can download, install and use this software.
  • Please read Minimum System Requirements, below.

IMPORTANT: Xtreme Prototypes next generation addons are designed to take advantage of the new and more powerful gaming computers that are available today. They require better graphics cards and more processing power and RAM than other more conventional addons. Increased performance will be noticed on more powerful systems. Before purchasing this product, make sure you have the minimum system requirements or better. For obvious reasons, downloads are not refundable.


  • Flight Simulation Platform (depending on the addon version installed): Lockheed Martin® Prepar3D® v5 (Hotfix 1, see note below), Lockheed Martin® Prepar3D® v4.5 (Hotfix 2), Microsoft® Flight Simulator X: Steam® Edition or Microsoft® Flight Simulator X SP2 with Acceleration Expansion Pack (or FSX Gold fully installed).** This product is not compatible with earlier versions of Microsoft® Flight Simulator.
  •  Operating System: Windows® 10/8.1/8/7 (64-bit version required for Prepar3D®)*.
  •  Computer Memory (RAM): 16 GB or better recommended*
  •  Processor: Quad Core 3.0 GHz or better recommended*
  •  Hard Drive Space: Downloaded ZIP file size approx. 1.5 GB, each addon version size approx. 6 GB when installed*
  •  Graphics Card: A high-end graphics card with at least 8 GB GDDR5 or better is highly recommended*. Installing this addon in Prepar3D® requires a DirectX® 11-compatible graphics card*. Make sure you have the latest driver for your operating system.
  •  Graphics: DirectX® 12, 11, 10 or 9 (depending on your simulator’s requirements)*
  •  Other: Wheel mouse, controller (joystick or yoke), pedals (optional), sound card and speakers, Adobe® Acrobat® Reader, Adobe® Photoshop® CS5 or later (optional, required for using the paintkit). A wheel mouse is required to actuate 3-position switches and some knobs.

*: Refer to your simulator’s documentation for more information.

**: Please note that some software features available in the native Prepar3D® versions may not be available in the FSX versions due to software limitations in FSX.


Note for Prepar3D® v5.x users: Third-party addons have not been thoroughly tested in Prepar3D® v5. Before adding your third-party GNS/GTN or radars to the cockpit of the GLJ Model 25 SE v3 addon, please make sure that they are compatible with Prepar3D® v5. Contact the developer for more information. Xtreme Prototypes cannnot provide technical support for third-party software.


General Features

23 aircraft variations, inspired from actual and fictitious models and liveries:

  •  XP GLJ25SE v3 Test Airplane (fictitious tail number N486XP)
  •  XP GLJ25SE v3 Rollout Version (fictitious tail number C-XPAV)
  •  Canadian Blue Jay Private (fictitious tail number C-DBXP)
  •  U.K. Blue Bird Private, inspired from actual liveries (fictitious tail number G-KEXP)
  •  American Red Belly Private, inspired from actual liveries (fictitious tail number N864XP)
  •  American Golden Bird Private (fictitious tail number N6XP7)
  •  Australian Private (fictitious tail number VH-XPA)
  •  Australian Xtreme Pro Commercial (fictitious tail number VH-DXP)
  •  French Private, inspired from actual liveries (fictitious tail number F-GLXP)
  •  German Private, inspired from actual liveries (fictitious tail number D-XPSE)
  •  Spanish Private (fictitious tail number EC-DXP)
  •  Italian Private (fictitious tail number I-XPAO)
  •  European Humanitarian Aid Transport (fictitious tail number F-OZXP)
  •  Mexican Private, inspired from actual liveries (fictitious tail number XA-XPS)
  •  Brazilian Private (fictitious tail number PR-ZXP)
  •  Canadian Federation Red Bird (fictitious tail number C-GAXP)
  •  Canadian Marine Mammal Research Center (fictitious tail number C-FXPZ)
  •  Canadian Federal Police (fictitious tail number CGMXP)
  •  Canadian Government Black V.I.P. Transport, inspired from actual liveries (fictitious tail number 150018XP)
  •  U.S. Army V.I.P. Transport (fictitious tail number 68052X)
  •  U.S. Army Night Camouflage Transport (fictitious tail number 68052X)
  •  U.S. Government Area 51 Special Ops, inspired from actual liveries (fictitious tail number N4251XP)
  •  U.S. Air Force V.I.P. Transport, inspired from actual liveries (fictitious tail number 60214XP)

Note: All liveries are imaginary, though some may be inspired from actual airplane liveries. Any match with actual tail numbers is a pure coincidence.


Flight Model Features

Optimized, pilot-tested, 20 Series flight dynamics to simulate the performance of a high-powered civilian jet aircraft on your simulation platform:

  •  Two General Electric CJ-610, 2,950-pound static thrust, single-spool turbojet engines
  •  Service ceiling: 45,000 ft.
  •  Absolute ceiling: 51,000 ft.
  •  Maximum speed: 359 KIAS
  •  Maximum Mach: Mach 0.82 (at 24,000 ft.)

20 Series Aircraft Systems

The following 20 Series aircraft systems are simulated to conform as closely as possible to the operation of the real airplane, within the present limitations and capabilities of the available simulation platforms:

  •  Flight controls
  •  Stall/overspeed warning systems with stick nudger/puller and stick shaker
  •  Electrical system
  •  Emergency batteries (APU)
  •  Ground power unit (Prepar3D® GPU)
  •  Hydraulic system (including functional electric auxiliary hydraulic pump)
  •  Landing gear, anti-skid system, differential brakes
  •  Fuel system (including cross-feeding and wingtip tanks fuel jettison system)
  •  CJ-610 power plant
  •  Fire detection and suppression system
  •  Pneumatic (high pressure), bleed air, pressurization and environmental control systems
  •  Air conditioning and cabin temperature (H-valve) system
  •  Anti-ice system
  •  Automatic flight control system (AFCS) with autopilot, flight director, yaw damper and speed/Mach hold systems
  •  RVSM system, complete with digital altimeters/altitude preselectors (ADDUs) with blue VFD display, analog standby altimeter and control panel (retrofitted panels)
  •  Caution and warning system
  •  Avionics, radio and navigation systems (COM1, COM2, NAV1, NAV2, ADF1, ADF2, transponder, DME)
  •  GPS (default Prepar3D® or FSX)
  •  GNS, GTN, weather radar, transponder (3D bezels, screens and programmable knobs included ; software not included and must be acquired from third-party vendors/developers)
  •  GPWS (retrofitted panels)
  •  Emergency gear extension system
  •  Crew and passenger oxygen system
  •  Main entry door (fully animated)
  •  Cockpit and cabin lighting systems, including emergency lighting (see details below)

Aircraft Exterior 3D Model Features

  •  High resolution 3D exterior model, optimized for the latest versions of Lockheed Martin® Prepar3D® and Microsoft® Flight Simulator X
  •  Highly detailed model inspired from the real aircraft, with more than 2,200 objects and 80 animations
  •  4096 x 4096 high resolution textures with reflection and specular maps (Fresnel ramps are used in all model materials for more realistic angles of reflection/specularity)
  •  Unique markings and liveries for each aircraft variation
  •  Movable aerodynamic control surfaces:
    • Movable horizontal stabilizer
    • Elevator
    • Ailerons with trim and balance tabs
    • Flaps
    • Vertical stabilizer/rudder with trim tab
    • Spoilers
  •  Fully animated landing gear, complete with flexible hoses, landing and taxi lights, anti-skid system, snubbers, and more
  •  Fully animated main door (lower and upper sections)
  •  Detailed GE CJ-610 power plant with animated (compressor and turbine) blades and inlet guide vanes
  •  Fully animated thrust reverser on both engines
  •  Dynamic lights with projected light beams (Prepar3D®) and/or conventional external light effects (FSX):
    • Separate L/R 2-intensity landing and taxi lights
    • Animated rotating beacon lights (belly, tail)
    • Right wing inspection light
    • Recognition lights (optional on the left wingtip tank)
    • Navigation lights (wingtip tanks, tail)
    • Strobe lights (wingtip tanks, tail)
  •  Animated stall vanes on the nose
  •  Optional nose test probe with vanes
  •  Four user-selectable pilots (three male, one female, with headset and optional sunglasses)
  •  Fully modeled and functional ground power unit (GPU) supplying 28 VDC to the aircraft during maintenance, training or preflight procedures (with animation, lights and sound - Prepar3D®)
  •  Clickable hotspots on the exterior model (Prepar3D®):
    • GPU visible/invisible (left wingtip tank aileron)
    • Crew present/absent (steps on the lower portion of the main door)
    • Pilot selection (pilot’s shirts)
    • Pilot’s sunglasses (windshield defog outlets)
    • Cabin and entry lights (cabin wall switches)
    • Main exit door open/close (door handles)
    • Remove before flight items installed/removed (nose gear door)
    • Left recognition light installed/removed (wingtip tank nose cone)

Aircraft Interior 3D Model Features

  •  Four (4) high resolution, VR-ready* 3D virtual cockpits with different panel configurations, over 2,600 objects and more than 250 full-3D animated gauges, switches, knobs, levers, light indicators and flight instruments with tooltips:
    • Classic Configuration - Features a classic analog instrument panel from the 1970’s, similar to the original Learjet 25 panel. A GNS 530 and a weather radar are also installed.
    • Retrofitted Configuration - New radios with yellow VFD displays have been installed in the main instrument panel to replace the original sets with analog displays from the 1970’s. A GNS 530 and a weather radar are also installed.
    • GTN 650/750 Configuration - Features modern avionics including GTN 650/750 GPS/NAV/COM/ATC multifunction display systems, a weather radar and new radios with yellow VFD displays. This is how some Learjet 25 still in service today have been retrofitted in recent years.
    • Dual GTN 750 Configuration - Features modern avionics including two GTN 750 GPS/NAV/COM/ATC multifunction display systems, a weather radar and a new ADF radio with a yellow VFD display. This is how some Learjet 25 still in service today have been retrofitted in recent years.

Note: GNS, GTN, radar and special transponder addons are not included and must be purchased separately. Available from third-party vendors/developers.

  •  Full 3D integration of the GNS/GTN, radar and transponder, configurable to meet most user needs. Screens, buttons and knobs can be programmed by the user to integrate almost any third-party addon. Experimentation may be required:
    • Fully animated 3D model of the GNS 530, compatible with the simulator’s GPS 500 and the Reality XP GNS 530 addon (not included, available from Reality XP), also compatible with the Flight1 GNS 530 addon (not included, available from Flight1)
    • Fully animated 3D model of the GTN 650 and 750, compatible with the Reality XP GTN 650/750 addon (not included, available from Reality XP), also compatible with the Flight1 GTN 650/750 addon (not included, available from Flight1)
    • Fully animated 3D model of a weather radar, compatible with the Rex/Milviz WX Advantage weather radar (not included, available from Rex Simulations)
    • Fully animated 3D model of a transponder with a front VFD display, compatible with most special third-party transponder addons supporting C mode of operation and other features (not included, available from third-party vendors/developers)
  • Advanced instrument panels:
    • Captain’s panel
    • Center panel
    • Electrical and radio panels
    • Copilot’s panel
    • Annunciator panel
    • Thrust reverser control panel
    • Center pedestal
  •  Two (2) interior colors: the classic and retrofitted models have a beige interior; the two GTN models have a black interior
  •  4096 x 4096 high resolution textures with reflection, specular and new emissive maps (no mipmaps are used for the interior textures of the Prepar3D® models to fix VR issues and to improve overall image quality, Fresnel ramps are used in all model materials for more realistic angles of reflection/specularity)
  •  Animated control columns and yokes (hideable, user-selectable), with stick nudger/puller and stick shaker animation, and functional autopilot buttons
  •  Animated rudder pedals with differential brakes
  •  The classic panel configuration features modified radios with mechanical analog displays, like in the original aircraft from the 1970’s (COM1 with alternate frequency, COM2, NAV1, NAV2, ADF1, ADF2, transponder)
  •  Retrofitted panel configurations feature new radios with yellow digital VFD displays and standby frequencies (COM1, COM2, NAV1, NAV2, ADF1/2, ATC/transponder)
  •  RVSM system, complete with digital altimeters/altitude preselectors (ADDUs) with blue VFD display, analog standby altimeter and control panel (retrofitted panels)
  •  Independent flight director
  •  NAV1 or GPS/GNS/GTN navigation modes. The Learjet autopilot is retrofitted to be fully functional in GPS mode.
  •  DME head
  •  Ground proximity warning system (GPWS, retrofitted panels)
  •  Engine sync spinner (retrofitted panels)
  •  Analog and digital clocks with stopwatch
  •  Functional Lear Jet Stereo “Jetstar 8” 8-track tape player on the center pedestal that can play the user’s music - a tribute to the inventive genius of Bill Lear (optional in the dual GTN 750 retrofitted panel configuration)
  •  Side control knobs (light switches, cockpit fan switch, map light switches)
  •  Oxygen valves
  •  Pilot seats with adjustable armrests
  •  Animated and slidable sun visors
  •  Hideable throttle quadrant
  •  Thrust reverser subthrottles
  •  Hideable (dummy) tablet on the copilot side
  •  Cabin curtains behind the cockpit (open or close, switchable)
  •  Cockpit lighting system, including ceiling lights, emergency lighting, 2-intensity glareshield flood lights, map lights, instrument lights (Prepar3D®)
  •  Cabin lighting system, including ceiling lights, emergency lighting, signs, door entry lights and passenger reading lights (can be controlled individually, Prepar3D®)

*: Along with the highly detailed aircraft interior, the full 3D virtual cockpits make this addon an ideal candidate for new virtual reality devices and applications such as FlyInside®.

Note: Xtreme Prototypes next generation addons no longer include 2D panels found in legacy products. They are replaced by full 3D virtual cockpits. Except for the LCD screens and the new radio’s VFD displays, no flat 2D gauges are used in this addon.


Visual Effects

  •  Engine smoke and contrail effects
  •  GPU starter smoke (Prepar3D®)
  •  Wing vortices and vapor trails
  •  Dynamic lights with projected beams (Prepar3D®)
  •  Aircraft lights, some animated (landing, taxi, recognition, navigation, strobes, rotating beacon, wing inspection)
  •  Cockpit/cabin lights (panel flood lights, ceiling lights, map lights, passenger reading lights, entry lights (Prepar3D®)

Sound Effects

  •  20 Series 3D sound set, including starter and engine sounds recorded from the real aircraft and positioned in the 3D space
  •  Over 50 additional cockpit stereo sound effects, many from the real aircraft: switches, knobs and levers, pneumatic valves, blower fan, alerts and horns, brake (“birds in the cockpit”) sounds, GPU, etc.

Miscellaneous

  • Native Prepar3D® v5 (Hotfix 1) version
  • Native Prepar3D® v4.5 (Hotfix 2) version
  • FSX and FSX Steam® versions
  •  “Cold and Dark” cockpit reset cycle and “Auto Start” sequence
  •  FBGS sound system for playing cockpit sounds and music (used under license)
  •  5 external camera views
  •  10 internal camera views
  •  A 330-page printable PDF manual (requires Adobe® Acrobat® Reader)
  •  A comprehensive paintkit to allow users to create their own liveries (requires Adobe® Photoshop® CS5 or later)

Note: Software features are subject to change without notice. Some functionalities may differ from those in the real aircraft due to limitations in the simulation platforms.

Some features available in the native Prepar3D® versions may not be available in the FSX versions. Due to some limitations in the FSX simulation platform, the FSX versions contain less animations and features than the native Prepar3D® versions. However, systems and procedures are the same on all platforms and this has no impact on the simulation.

Third-party GNS/GTN, radar and special transponder units are not included and are sold separately. Available from third-party vendors/developers.


Peter Stark, PC Pilot Magazine (UK, July/August 2020):
"This most recent model in the series is not a simple upgrade but a major rebuild for FSX and Prepar3D… A fun, fascinating aircraft that exposes you to the skills required by the early Lear pilots as they launched into the sky. The Xtreme Prototypes GLJ25v3 is packed with features, animations and realistic behaviour, systems and impressive innovation. This makes it a very worthy recipient of the PC Pilot Platinum Award (95/100)."


About version 2.0/2.1:

Peter Stark, PC Pilot Magazine (UK, January/February 2017):
"Flying the Xtreme Prototypes GLJ Model 25 SE is exhilarating! The list of updates and refinements are so extensive, it really has been built from new with a large list of features that combines high levels of visual and performance realism. Wonderful period realism that accurately reflects the pilot workload and aircraft performance while simultaneously delivering a lot of fun for the pilot.This product is highly recommended and definitely one for your hangar."

Alan Velazquez, Real-world Learjet 25D Pilot (Venezuela, May 2017):
"The most advanced, detailed and faithful classic Learjet simulation you can find! I was impressed by the flight dynamics the team at Xtreme Prototypes had developed for their unique model. In simple words, it was almost like flying the real aircraft, a quality rarely found in other Flight Simulator addons."

Emmanuel Blanchard, Micro Simulateur Magazine (France, October 2016):
"Xtreme Prototypes perfectly rendered the characteristic atmosphere on board this luxury aircraft with amazing performances. Passing the AI airliners along our path is easy and above all, we fly higher: we've conducted a few transcontinental flights at 41,000 ft. without the risk of crossing any other aicraft at this altitude. It's with real pleasure that we were able to play the VIPs at high altitude and jump from one dream destination to another."

Ray Marshall, Avsim.com (U.S.A., March 2017):
"If you are looking for an up-to-date modern design, high definition, and highly detailed Classic Learjet, you can’t do any better than this one. The closer you zoom in to the panel, the more you appreciate just how well these new 3D gauges are performing – super sharp images for my old eyes! Overall, this is one of the most detailed and complete addons that I have in my virtual hangar."

Ryan Butterworth, Avsim.com (U.S.A., August 2016):
"Love the sounds, the VC clickability/systems/operation. Enjoyed the flight model, the handling, the graphics inside and out. This is the bizjet to own guys!"


Listed below are the latest available patches for your Xtreme Prototypes GLJ Model 25 SE v3.0 addon - for registered users only. To download these files, please login to your Xtreme Prototypes online account.


(2020-06-30) New Dynamic Light Effects for Prepar3D® v5 with Hotfix 2 - Following the release of Prepar3D® v5 with Hotfix 2, we have noticed a few issues with some of the interior/exterior dynamic light effects that were originally calibrated for Prepar3D® v5 with Hotfix 1. These new light effects will fix these issues. This affects the Prepar3D® v5 version of our GLJ Model 25 SE v3 addon only, if you have installed Prepar3D® v5 with Hotfix 2.