To adjust trim settings in FSX, open the controls options, assign pitch trim up and pitch trim down to buttons or keys you can reach easily, and remove any duplicate assignments that may fight each other. For most aircraft, pitch trim is the setting that matters most; rudder and aileron trim are secondary and may not be needed in every aircraft.
What trim settings matter in FSX
When most simmers ask about trim in Microsoft Flight Simulator X, they usually mean pitch trim. That is the control we use to stop the aircraft constantly drifting nose-up or nose-down.
Pitch trim
This is the most important trim control in FSX. We use it after changing power, speed, flap setting or climb/descent attitude so the aircraft will hold its attitude with minimal control input.
Rudder trim
Rudder trim helps counter yaw. It is most useful in aircraft with strong propeller effects, during some engine-out situations, or in larger aircraft that model rudder trim more prominently.
Aileron trim
Aileron trim corrects a rolling tendency. Some aircraft use it, some barely need it, and some add-on aircraft handle it differently.
If you only set up one trim control in FSX, make it pitch trim.
How to change trim settings in FSX
- Open the controls settings
From FSX, go into the controls area where buttons, keys and axes are assigned. The same general process applies in both FSX boxed and FSX: Steam Edition.
- Select the device you want to use
If you have a keyboard plus a joystick, yoke or throttle quadrant connected, make sure you are editing the correct device. A common mistake is changing one controller while another still has an old trim assignment active.
- Assign pitch trim buttons or keys
Look for commands such as
pitch trim upandpitch trim downor the equivalent elevator trim commands. Bind them to two buttons you can reach without looking away from the screen. For many pilots, this is the most practical setup. - Optionally assign a trim axis
If your hardware has a spare wheel, lever or rotary control, you can assign it as an
elevator trim axis. This gives finer control than tapping buttons, especially during approach and landing. - Check for conflicting assignments
Make sure the same button, key or axis is not assigned to multiple commands. Conflicts are one of the main reasons trim feels erratic or unresponsive in FSX.
- Fine-tune sensitivity and dead zone
If your trim axis is jumpy, reduce its sensitivity slightly or increase the dead zone a little. If it feels sluggish, do the opposite. Small changes are usually enough.
- Test the setup in flight
Load a simple default aircraft in calm weather, climb to a safe altitude, stabilise the aircraft, then apply a few trim inputs. The nose should respond smoothly without sudden jumps.
Best trim setup for FSX
The best setup depends on how you fly, but we generally recommend keeping trim simple and easy to reach.
Keyboard only
- Assign one key for trim nose up and one for trim nose down.
- Keep them close to your normal hand position.
- Use short taps rather than holding the key down.
Joystick users
- Use two buttons, a hat direction or a small rocker switch for pitch trim.
- Avoid putting trim on a control you may press accidentally during take-off or landing.
- If your joystick has a spare slider, test it as a trim axis, but only keep it if it is smooth and stable.
Yoke or throttle quadrant users
- A dedicated wheel or lever for pitch trim usually gives the best precision.
- Make sure the axis is not shared with another command.
- If the trim moves by itself, the axis may be noisy and need recalibration or a slightly larger dead zone.
How to use trim properly in FSX
Good trim technique matters just as much as the control assignment itself. Many trim problems are actually flying-technique problems.
- Set power and attitude first
Do not use trim to force the aircraft into a completely different phase of flight. First choose your power setting and pitch attitude for climb, cruise, descent or approach.
- Hold the desired attitude
Use the yoke or stick to place the aircraft where you want it.
- Apply small trim inputs
Tap or move trim in small increments until the aircraft stays close to the chosen attitude on its own.
- Re-trim after every major change
Whenever you change speed, power, flap setting, gear position or configuration, expect to trim again.
On final approach, trim should help you maintain a stable speed and attitude. It should not be used to chase the glide path with large corrections.
Why trim may not be working in FSX
- Conflicting controls
Two devices may both be sending trim commands, or the same axis may be assigned twice.
- Autopilot is engaged
Some aircraft manage pitch or trim while the autopilot is active. In that case, manual trim inputs may seem weak or ignored.
- Noisy hardware axis
A worn slider or wheel can send constant tiny inputs, making trim wander on its own.
- Aircraft-specific behaviour
Some add-on aircraft use custom systems and may not respond exactly like the default FSX aircraft.
- Out-of-balance loading
If the aircraft is badly loaded or the centre of gravity is unrealistic, you may need excessive trim and the aircraft can still feel unstable.
Should you use buttons or an axis for trim?
For most FSX pilots, buttons are the safest and simplest choice. They are easy to assign, less likely to jitter, and work well in both default and add-on aircraft.
An axis is better if you have good hardware and want finer control, especially for hand-flown approaches. The drawback is that a poor-quality axis can create constant unwanted trim movement.
How much trim should you use?
Only as much as needed to relieve control pressure. In the sim, that means the aircraft should hold its attitude and speed reasonably well without you constantly pulling or pushing on the controls.
If you are using large trim changes all the time, look for an underlying cause:
- too much airspeed change
- incorrect power setting
- flaps or gear just moved
- poor aircraft loading
- an unstable approach
Common trim mistakes in FSX
- Over-trimming: holding the trim button too long and then correcting back the other way.
- Using trim instead of pitch control: trim supports the attitude; it does not replace basic aircraft control.
- Ignoring configuration changes: after flap or power changes, the aircraft will usually need re-trimming.
- Leaving duplicate bindings active: this is one of the fastest ways to make trim feel broken.
Quick answer
If you just want the shortest route to a better setup, assign pitch trim up and pitch trim down to easy-to-reach buttons, clear any conflicting assignments, and test in a simple aircraft before moving to more complex add-ons. That gives most FSX users the smoothest and most reliable trim control.