Latest News

iFly Releases Advanced 737NG for Prepar3D v5

November 20, 2021

iFly Releases the Advanced 737NG for Prepar3D v5.

The iFly Development Team, in partnership with Flight One Software, has officially released iFly Jets Advanced Series – The 737NG, exclusively for Prepar3D v5.2.

This base package, which contains the -800 and -900 variants, is iFly Development Team’s most advanced addon to date.

The iFly Development Team has dug deep into the features within the Prepar3D v5 platform to bring you these new features:

  • Supports Prepar3D v5.2 and DirectX 12
  • Built around Enhanced Atmospherics (TrueSky)
  • All New High Definition Virtual Cockpit models.
  • Full PBR materials Virtual cockpit based on the P3D v5.2 changes.
  • All New High Definition External models including Scimitar Winglets and much more.
  • Ultra-High Definition Textures and Display Units in the Virtual Cockpit – VR compatible.
  • New Dynamic Lighting system for the Virtual Cockpit (works anytime, day or night).
  • Ultra-Resolution PBR material textures for the External Models.
  • New Dynamic Lighting system and Effects for External Models, supporting PBR & non-PBR surface materials.
  • New iFly developed Engine sound core system (engine sound & tone will change based on thrust, altitude & air density).
  • New Immersive Audio Engine sounds (pilot view orientated).
  • New fully Immersive Audio Cockpit sounds.
  • Electronic Flight Bag with Navigraph Terminal Charts integration (requires Navigraph subscription).
  • Cabin Light intensity control.
  • New Collimated HUD.
  • And a lot more!

The product has been tested by real NG pilots to help maintain the accuracy required for this simulation.

Extensive aircraft configurations are available via the configuration tool, including jet engine types, eyebrow windows, MCP variations, and multiple wingtip configurations. Free liveries are available via the public Flight1 Library System.

The super-high resolution virtual cockpit makes the cockpit extremely readable on your monitor, and is an ideal simulation for those that use Virtual Reality headsets. With the ultra-high details and sound engine when using a Virtual Reality headset, it’s like you are really in the cockpit!

If you are a previous FSX/P3D purchaser of the iFly 737NG, you can receive 20% off your new purchase if you have the FSX version, and 25% off if you have the earlier Prepar3D version.

For more information on the product please visit, or the product page directly at

Prepar3D v5.2 Hotfix 1 Now Available

June 30, 2021

The Prepar3D v5.2 Hotfix 1 ( is now available and can be downloaded immediately from the Purchased Downloads section of the website.

The Prepar3D v5.2 Hotfix 1 contains resolutions for high priority issues identified after the Prepar3D v5.2 release.

Only the Client installer is required for the majority of fixes present in Prepar3D v5.2 Hotfix 1. Therefore, the Content, Scenery, and SDK installers are optional. Each fix listed below is categorized per installer. Please note, you must first have Prepar3D v5 installed to utilize any of the standalone installers (Client, Content, and Scenery). The Prepar3D v5.2 Hotfix 1 update may require you to reactivate your product, however if you have an internet connection or have not made any major hardware changes between installations this should not be an issue. For more information please view the Prepar3D v5 Download and Installation Directions.

The newly posted Prepar3D v5.2 ( Full Download on the Purchased Downloads page includes Hotfix 1.

If Prepar3D was installed before updating to the hotfix it is strongly recommended to run the “Delete Generated Files” shortcut in Prepar3D’s installation directory after installing the hotfix and before running Prepar3D for the first time. This will revert Prepar3D to its default settings but may also impact the installation of add-ons. If running this is not possible due to add-on configurations then removing the VolumetricClouds.cfg in the “%appdata%\Lockheed Martin\Prepar3D v5” is strongly recommended due to changes to cloud appearances made in the hotfix.

Please be aware that some third party developers may have to update their add-ons to be compatible with this hotfix. Please contact the third party developers directly for any compatibility questions.

Client Fixes and Improvements

  • Added configuration option to use HTML5 Menu and Information Text, defaulted to off.
  • Fixed issue preventing views from rendering on Intel graphics cards in some cases.
  • Fixed performance issue with multiple views when using vsync.
  • Updated default cloud visuals. Requires running the “Delete Generated Files” script in the Prepar3D installation directory or manual removal of the VolumetricClouds.cfg file located @ “%appdata%\Lockheed Martin\Prepar3D v5” directory after updating.
  • Improved performance of autogen building and scenery objects.
  • Fixed crash on AMD cards with particle shadows enabled.
  • Fixed issues with HTML5 Menus and Information Text causing black screens and stutters when opening.
  • Fixed issue where changing Volumetric Cloud settings would not update graphics profile name in settings.
  • Screen is now blacked out when crashing.
  • Fixed issue with multi-UV PBR materials not working properly in some cases.
  • Prevent Developer Menu from being dragged offscreen when docked.
  • The alt key now opens and closes the VR menu similar to the standard menu bar.
  • Fixed crash that could occur when moving views across displays on different graphics cards.
  • Fixed issue where menu bar could remain hidden after loading scenarios in some cases.
  • Fixed issue where Weather UI was not correctly showing negative values for visibility layers.
  • Performance and stability improvements for Oculus VR headsets.
  • Fixed issue where weather changes made through the UI would interpolate instead of instantly applying in some cases.

Scenery Fixes and Improvements

  • Fixed missing PPL_Construction1_LM texture.

SDK Fixes and Improvements

  • Added PDK function to IMultiplayerService to set transmit and receive frequencies for voice transmission.

Thanks again for your support!

Prepar3D Attending FlightSimExpo in San Diego this September

June 30, 2021

The Prepar3D team will be joining top flight sim hardware and software developers at FlightSimExpo 2021 on September 24-26, 2021 at Town and Country Resort in San Diego, CA. 

The conference and tradeshow is an all-ages event that welcomes simmers and pilots of all experience levels. The in-person event features a 30,000 square foot exhibit hall where attendees can try the latest in simulation technology, experience virtual reality, and win prizes in landing competitions and other contests. The event also hosts a series of seminars on flight simulation topics. This year’s presenter lineup includes experienced flight simmers, airline pilots, flight dispatchers, an NTSB accident investigator, and developers of flight simulation software and hardware.

Lockheed Martin will be in attendance to represent Prepar3D, a visual simulation platform that allows users to create training scenarios across aviation, maritime, and ground domains. Prepar3D has become the go-to platform for serious flight simmers and developers creating top-tier simulation add-on products. The Prepar3D team will be hosting a “questions and answers” session with in-person attendees at 3:15pm PDT on Saturday, September 25.

For those unable to physically attend, FlightSimExpo 2021 is offering an online registration for $15. This online registration includes exclusive access to event seminars and the ability to chat and engage with participating developers throughout the weekend. In partnership with the large online networks, virtual attendees will also be able to participate in a simulator fly-in to KSAN on Saturday alongside other online activities during the weekend.

Through FlightSimExpo, attendees can book hotel rooms for $150/night, including all taxes and fees. Airline discounts are available from Delta, Southwest, and WestJet. Attendees can save up to 30% on rental cars through Enterprise.

To attend the show, find out about discounts, and view the full schedule of events and exhibitors, visit

Prepar3D v5.2 Out Now!

June 9, 2021
Improved Atmospheric Lighting and Shadows

Prepar3D v5.2 brings a large number of features and improvements to the Prepar3D platform. Continual improvements have been made to the Enhanced Atmospherics system offering better visuals while reducing memory usage. Improved atmospheric lighting and shadows, better volumetric cloud generation and enhanced precipitation effects to further improve realism and training fidelity. Additional enhancements made to the DirectX 12 rendering system continue to improve performance and stability to enable support of even greater detail and scale in training scenarios. Light up the night sky with the addition of road lights and improved airport lighting. Developers have access to more tools including built-in support for viewing models and resetting various system states during program execution. Additionally multiple improvements have been made to DIS and CIGI making large scale training scenarios easier to configure, more robust and performant, and offering greater interoperability across various other systems.

The following list of updates has been categorized based on the installer required. The Client installer is required for Prepar3D v5.2, however the Content, Scenery, and SDK installers are optional. You must first have Prepar3D v5 installed to utilize the Client only installer.

To install the Prepar3D v5.2 Client, you must first uninstall the previous Prepar3D v5.0/v5.1 Client through Programs and Features in Windows Control Panel. Do not deactivate your license when prompted. If you selected to deactivate your license during uninstallation of your current Client, your will be prompted to reactivate Prepar3D. Please view the Prepar3D v5 Download and Installation Instructions for more information.

Prepar3D Client

General Platform Updates

New Features

  • Added road lights setting to generate lights along roads.
  • Enhanced Atmospherics can now be used with legacy (non-volumetric) clouds.
  • Various graphics settings can now be changed while sim is running.
  • Particles can now be dynamically lit.
  • Added developer menu allowing for shader and texture reloads and viewing models.
  • Added terrain awareness post process effect.
  • Added orthogonal view support to camera system. Can be set in camera configuration and PDK.
  • Added default weather radar view and SDK sample.
  • Updated multiplayer communication to support UHF frequencies.
  • Added view angle support for facing particles.
  • Added support for the VRgineers XTAL VR headset.
  • Added support for the Varjo XR-3 VR headset.
  • Added CallbackMethod option to RecordAndPlayback.xml allowing for plugins to listen to individual property changes during playback.

Fixes and Improvements

  • Improved rendering system performance and stability.
  • Improved handling of VRAM over-allocation.
  • Various particle system performance optimizations.
  • Improved Enhanced Atmospherics performance and reduced memory usage.
  • Updated Enhanced Atmospherics lighting.
  • Improved Enhanced Atmospherics dawn/dusk appearance.
  • Improved Enhanced Atmospherics precipitation and lightning effects.
  • Fixed hole that would appear around user vehicle in clouds with Enhanced Atmospherics.
  • Improved cloud grid generation with Enhanced Atmospherics.
  • Improved cloud shadow appearance with Enhanced Atmospherics.
  • Fixed ghosting around user vehicle with Enhanced Atmospherics.
  • Fixed crash in VR that could sometimes occur when bringing up tool tip text.
  • Fixed crash that could sometimes occur when opening the eye tracking window.
  • Added DeviceDataFormats.xml file to configure X-Grip DirectInput data.
  • Fixed issue where vehicle stress was not respecting crash settings in the UI.
  • Optimized resource usage including VRAM usage in VR single pass mode.
  • Converted the Menu Bar, Context Menu, VR Menu, and Information Text (InfoGen) to HTML5.
  • Information Text and Message Text are now visible in VR.
  • Fixed issue where exposure values could become out of sync in VR.
  • Fixed jitter that could be seen in ISimObjects in multiplayer in some cases.
  • Updated ISimObject AI logic.
  • Added health to the Indago rotor system to prevent vehicle from flying when health points reach zero.
  • Added option to save current scenario when closing the application or when a driver hang occurs.
  • Fixed various memory leaks.
  • Fixed issue in SimDirector where flight segments would render incorrect start/end times when first loading a scenario.
  • Fixed issue where SimProp recordings would not correctly initialize motion variables when loading from a bookmark.
  • Optimized SimProp recording saving.
  • Added ReadableFrequency SimProp setting for recordings.
  • Uninstalling the application no longer generates configuration files used for default settings.
  • Fixed issue with dynamic lights displaying incorrectly in the right eye in VR in some cases.
  • Fixed issue where the scenario startup screen would sometimes show the wrong location after loading a scenario.
  • Fixed additional z-ordering issues with objects in Enhanced Atmospherics.
  • Fixed issue where changing seasons in the startup screen would not account for daylight savings time changes.
  • Fixed issue where simulation fidelity could be limited to lower bounds when overriding SimGroup simulation rates.
  • Fixed issue where mixing PBR and non-PBR material scripts in models could cause visual issues in some cases.
  • Fixed issue where right clicking to bring up the context menu would sometimes cause the camera to rotate.
  • Scenario entities now initialize with correct airspeed if spawned in the air.
  • Fixed issue where ground speed was returned instead of airspeed for AI entities.
  • Units can now be set for airspeed and altitude in SimDirector.
  • Optimized GetCameraLookAtLLA function.
  • Improved bloom lighting effect.
  • Added “Base Scenario Only” save option to save current conditions without modifying underlying scenario.
  • Added min/max top down altitude values to camera definitions.
  • Vehicle label draw distances are now configurable.
  • Fixed ray trace calculation used for terrain and entity hit testing.
  • Effects are now included in the client installer.
  • Updated VR menu.
  • Updated sky brightness based on time of day.
  • Fixed issue where certain add-on scenery error messages would not be displayed on startup.
  • Added ADF MAGVAR simvar.
  • HookEventProcess now works with ISimObject implementations.
  • Updated OpenVR version.
  • Added directory and category support to the SimDirector white list file.
  • Unnamed catalog objects are now ignored by SimDirector by default. This can be changed in SimDirector settings.
  • Fixed issue where closing panels in VR would cause them to stay open in the main view.
  • Fixed issue where ISimObjects would not load in the location specified by their role in multiplayer scenarios.
  • Mouse rotation cursor now appears over correct undocked view and is confined within window bounds while in use.
  • Resetting multiplayer scenarios now returns to the lobby keeping all players connected to the session.
  • Fixed issue with panel windows sorting incorrectly with transparent objects in VR.
  • Updated airport lighting to be more visible at night and during low visibility conditions.
  • Improved dynamic lighting performance in VC and single pass VR.
  • Fixed issue where closing an undocked view containing docked panels would prevent these panels from being reopened.
  • Fixed bug preventing FS9 and BGL models from drawing correctly at some angles in Single Pass VR.
  • Fixed issue that caused texture mismatches between eyes in VR for non-ultra water and ground detail textures.
  • Improved performance of multiplayer and DIS voice playback.
  • Fixed issue where recording would not prompt when overwriting an existing file.
  • Volumetric fog is now always enabled with Enhanced Atmospherics.
  • Record and playback properties can now specify range of indices for recording.
  • Fixed issue preventing TriggerProperty events from being played back correctly from recordings in some cases.
  • Panel texture sizes can now be non-square and non-power of two.
  • IP address used for GPS data transmission is now saved between sessions.
  • Fixed issue where center of gravity was shown in the wrong location in the Fuel and Payload UI.
  • Fixed issue with flight recorder that could cause invalid interpolation of various data types.
  • Fixed issue that prevented airline name changes for AI over SimConnect from being propagated.
  • Updated default multiplayer COM frequency.
  • Fixed issue causing multiplayer server to rebroadcast ISimObject positions to owner.
  • Added option to only save base scenario excluding scenario-specific object/trigger states.
  • Fixed issue that could prevent aircraft from crossing taxiway bridges in some cases.
  • Fixed issue where Windows would detect microphone usage at startup.
  • Fixed issue where voice sound device settings would not be updated while in a multiplayer session.
  • Multiplayer now toggles landing gear up when spawning in the air.
  • Progressive taxiway lines now account for sloped airport elevation changes.
  • Fixed propeller sound on turboprops with CCW rotating propellers.
  • Improved GPS logic for calculating when to transition to the next waypoint.
  • Fixed issue where certain helipad surfaces would not pull to ground at sloped airports.
  • Fixed invalid LLA exception that could occur at the poles.
  • Fixed issue preventing SubscribeToFacilities call from returning all pertinent airports/facility data.

Fixes and Improvements (Professional Plus Only)

  • User objects can now be controlled over DIS.
  • Custom loadouts can now be applied to player objects in SimDirector.
  • Fixed issue where reading DIS markings would sometimes be invalid.
  • Fixed issue where DIS force was not being assigned to objects attached to the user or avatar.
  • Added ChangeUserObject option to DIS host settings.
  • Fixed DIS stability issues with certain variable sized packet PDUs.
  • Fixed endianness swap logic for DIS audio data.
  • DIS host ownship can now be enabled/disabled without disconnecting.
  • User object can now be driven through CIGI.
  • Fixed bounds check for supported weather layers in CIGI.
  • Added ResetScenario and disable weather CIGI options.
  • Added CIGI passive mode.
  • Removed “UserIsOwnship” and “HideOwnshipModel” CIGI options. This is now based off of user object and camera settings automatically.
  • Fixed issue where velocity would not be sent by host in some cases.
  • Fixed issue where IG would not set velocity unless dead reckoning was enabled.
  • Fixed various issues with CIGI dead reckoning.
  • Updated CIGI view camera definitions.
  • CIGI host now freezes entities when entering the UI.
  • Added CIGI option to disable view control on IG.
  • Updated CIGI documentation.
  • CIGI camera definitions can now be defined per View Type instead of internal vs. external.
  • CIGI host now rebroadcasts view control packets when an IG connects.
  • CIGI host can now send to more than one IP address and port.
  • Fixed issue where DIS entities would not heartbeat frozen state when first paused.
  • Fixed issue where DIS would continue to try to create entities that had previously failed.
  • Fixed issue where rapidly toggling DIS connection via key event would cause connection issues.
  • Updated default DIS heartbeat values.
  • Added new key events for DIS entity Start/Resume and Stop/Freeze.
  • DIS Start/Resume and Stop/Freeze PDUs now support real-world start/stop times.
  • Converted Mixed Reality (MR) portal help text to HTML5.
  • Portal rendering is now disabled outside of VR views.
  • The Start/Resume PDU now changes the simulation time of day.
  • Fixed default DIS Site/Application/Entity values.
  • Fixed logic error when checking DIS BroadcastNavAids setting.
  • Fixed several rendering issues with MR cameras.
  • Added DIS Create Entity, Remove Entity, and Set Data PDUs.
  • Added floating point validation for received packet values over DIS.
  • Improved DIS AI waypoint logic.
  • Fixed bug where certain DIS Signal PDU parameters were being as the wrong data type.
  • Various improvements to DIS radios including broadcast format selection, improved audio quality, and better packet handling.
  • Improved error messages when DIS fails to connect.
  • Default DIS intercom priority is now zero.
  • Fixed issue where invalid data could be returned from the GetScreenCoord PDK function is point was behind the camera.
  • Fixed issue where effect shading did not match lighting conditions.
  • Pursue, Combat Air Patrol, and Close Air Support AI behaviors can now target player objects.
  • DIS intercom and radio state is now displayed in Infogen.
  • Fixed issue preventing weapon positions from being properly serialized in multiplayer in some cases.
  • Fixed crash that could occur in multiplayer if weapon jettison and reset commands were sent at high frequencies.
  • Fixed issue where countermeasure trigger and reset could process in the same frame.
  • Added sim configuration entry to control max time of flight for weapons.
  • Fixed issue where DIS would not broadcast PDUs for visibility or activation SimObject state changes.
  • Fixed freeze logic for local DIS entities.

Prepar3D Content

Fixes and Improvements

  • Fixed typos in F-16 descriptions.
  • Updated textures for sand, dirt, and grass runways.
  • Updated textures for various terminal buildings.
  • Updated F-14 and flatbed vehicles to no longer appear to hover when on ground.

Prepar3D Scenery

Fixes and Improvements

  • Updates to KRND, KLOU, KSDF, KEDW, and VETZ.
  • Fixed several scenery and water issues in the northern arctic region, Senegal, Guatemala, Kauai, and Alaska.
  • Fixed issue with jetways not moving in some cases.
  • Fixed issues with SIDs displays of certain VORs.
  • Correct Tacan X/Y frequencies.

Prepar3D SDK

New Features

  • Effect system now supports visible angle lighting and dynamic lighting.
  • Added weather radar PDK sample.

Fixes and Improvements

  • Updated OpenGLTexture sample.
  • Added ChangeUserObject PDK function.
  • Added OpenUIPanel function to PDK allowing HTML and Scaleform panels to be opened by name.
  • Added additional time conversion functions to DIS service.
  • Added ortho extent get/set functions to PDK for orthogonal views.
  • Updated VisualFX tool with new lighting and emitter properties.
  • Add quad draw to CustomPDKObjects SDK sample.
  • Added support for SetHealth on registered subsystems on ISimObject implementations.
  • Added new flags to PDK for preview window and SimOperator staging objects.

The Lockheed Martin Prepar3D team loves hearing about your experiences with Prepar3D at our Forums. The forums also give us an opportunity to listen to your feedback as we continue Prepar3D development. We’ve partnered with our forum users and with several featured developers to continue to bring added features, enhancements, and optimizations all while enabling additional backwards compatibility, making bug fixes, and improving stability.

Thank you for your continued support for Prepar3D.

Flight Simulation Association partner

March 7, 2021

We are excited to be a founding partner of the new Flight Simulation Association. To support the launch of Flight Simulation Association in the community, we’re offering a private forum board at for fellow FSA members to collaborate in all things Prepar3D.

We’re joining more than 50 other developers and content creators in this new community-wide effort, and we hope you’ll join too! Learn more at!

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