How do I install add-on aircraft after reinstalling FS2004?

After reinstalling FS2004, launch the clean simulator once, apply the official FS9.1 update, and test a default flight. Then reinstall each add-on from its original package, or copy a complete backed-up aircraft folder into Flight Simulator 9\Aircraft. Restore required gauges and effects separately, testing aircraft in small batches.

What order should I use after reinstalling FS2004?

The safest order is a clean FS2004 installation, the FS9.1 update, a successful default flight, and then the aircraft add-ons.

1. Run the clean simulator once. Start FS2004 before adding anything, then close it. This confirms that the base installation works and allows the simulator to create its user configuration files.
2. Locate the active FS2004 folder. Find the installation containing fs9.exe. A reinstall may use a different location from the old copy, so do not assume that an existing desktop shortcut or saved installer path is correct.
3. Apply FS9.1 and test again. Install the update before restoring add-ons, then load a default aircraft at a default airport. Our recommended FS9.1 update and reinstall sequence covers this clean-baseline process in detail.
4. Restore one aircraft first. Prefer the original archive or setup program. For a manual installation, the aircraft's own folder belongs directly under Flight Simulator 9\Aircraft.
5. Add only its required support files. Restore the gauges, effects and other dependencies supplied with that aircraft rather than copying whole folders from the previous installation.
6. Test before installing more. Check the aircraft-selection menu, cockpit instruments, sound, exterior model and lighting. Once it works, restore the remaining aircraft individually or in small, easily reversed batches.

Should I copy my backup or rerun the aircraft installer?

Use the original installer for complex aircraft and a manual copy only when the backed-up aircraft is known to be self-contained and complete.

Older setup programs may remember the former FS2004 path. If an installer reports success but nothing appears, inspect the destination it actually used. On a protected Windows installation, also verify that the installer had permission to write into the selected simulator folder.

Which aircraft files need to be restored?

A flyable FS2004 aircraft normally needs a complete aircraft folder plus any package-specific gauges, effects and shared dependencies.

• Aircraft folder: Place it under Flight Simulator 9\Aircraft. The folder should normally contain aircraft.cfg, an .air file and the relevant model, panel, sound and texture folders.
• Gauges: Copy only the gauge files or gauge folders named by the package into the main Gauges folder. Keep packaged cabinet files intact unless the instructions explicitly say otherwise.
• Effects: Put supplied effect files in Effects and any accompanying textures in the location specified by the package.
• Aliases and base aircraft: A panel.cfg or sound.cfg may point to a stock aircraft or another add-on. That target must exist under the exact folder name expected by the alias.
• Modules and other shared files: Reinstall these from the original setup program or documented package folders. Do not copy the entire old Modules directory into a clean installation.

Do not restore the former fs9.exe, overwrite the whole simulator directory, or replace every file in Gauges indiscriminately. For the standard directory patterns, see our FS2004 aircraft-folder and support-file instructions.

Can I copy the entire old Aircraft folder?

You can copy it, but selective restoration is safer because the old folder may contain modified stock aircraft, incomplete packages or the add-on that caused the original problem.

Copy add-on aircraft folders only, leaving the freshly installed default aircraft untouched. If many aircraft share a common panel, sound set or base model, restore that dependency first and test it before adding the variants that refer to it.

Why is the restored aircraft missing or broken?

A restored aircraft usually fails because it went into the wrong FS2004 installation, has an extra folder level, or is missing a shared file that the old installation supplied.

Why does it not appear in the aircraft list?

FS2004 will not list an aircraft if it cannot find a usable aircraft.cfg and matching flight model in the expected folder.

• Check for double nesting such as Aircraft\AircraftName\AircraftName\aircraft.cfg.
• Confirm that the sim= entry refers to the installed .air file without its extension.
• Make sure the download is a complete aircraft rather than a repaint requiring a separate base model.
• Inspect the [fltsim.x] entries for malformed sections or duplicated title= values.
• Search for another FS2004 folder in case an installer used the former path.

If the files appear correct, work through our checks for an add-on that does not appear in the aircraft menu.

Why are the panel, gauges or sounds missing?

Blank instruments or missing sound usually mean that a support file was not restored or an alias points to an absent aircraft.

Open the aircraft's panel.cfg and sound.cfg only to identify aliases; do not replace them blindly. Reinstall the package's documented gauges and dependencies from their original source. Copying random files from the old Gauges folder can reintroduce damaged or conflicting components.

Why does FS2004 crash after restoring an aircraft?

If FS2004 crashes only after one aircraft is restored, remove that aircraft and its newly added support files, confirm the clean simulator still runs, and reinstall the package from a fresh archive.

Check that the aircraft is intended for FS2004 rather than a later simulator, and load a default flight before selecting it. Restore further add-ons one at a time until the faulty package is identified; our diagnostic steps for FS2004 crashes caused by an aircraft cover the remaining model, panel and gauge checks.