Learn why landing gear collapses in a flight simulator, how to separate a hard landing from a model bug, and the practical fixes.
An aircraft’s landing gear usually collapses in a flight simulator because touchdown forces exceed the modelled gear limits. The usual triggers are excessive sink rate, landing overweight, touching down while drifting sideways, or an unlocked gear leg. Add-on failures, damage settings, runway collisions and aircraft-model bugs can produce the same result.
Across flight simulation and real-world aviation, the useful distinction is between a genuine load failure and a simulation fault. A collapse after a violent touchdown is plausible; a collapse at taxi speed on one particular runway deserves investigation.
What causes landing gear to collapse on touchdown?
Landing gear collapses when vertical, longitudinal or sideways loads exceed what the gear or its attachment points can carry. Shock struts and tyres absorb much of the impact, but they cannot protect against unlimited force; our explanation of how landing gear absorbs and transfers touchdown loads covers the underlying mechanism.
| Likely cause | Typical clue | Correction |
|---|---|---|
| Excessive sink rate | A heavy impact, bounce or immediate damage message | Stabilise the approach earlier and arrest the descent during the flare |
| Side loading | The aircraft touches down while crabbed or drifting across the runway | Align the wheels with the centreline and remove sideways drift |
| Excessive landing mass | The aircraft is above its normal or maximum landing weight | Reduce mass when possible or follow the aircraft’s overweight-landing procedure |
| Gear not down and locked | An unsafe, transit or incomplete gear indication remains before touchdown | Use the aircraft checklist and confirm a positive down-and-locked indication |
| Pre-existing failure | Hydraulic, structural or gear damage was present before the approach | Check failure menus, wear systems and add-on maintenance pages |
| Runway collision fault | The collapse happens at the same airport location, even at low speed | Test another runway and temporarily remove conflicting scenery |
There is no universal safe touchdown rate for every aircraft or simulator. Actual loading depends on aircraft mass, gear design, runway contact, pitch attitude and side force. Some add-ons model those factors in detail, while simpler aircraft may use a single vertical-speed threshold.
Maximum landing weight is not an automatic collapse point in real aircraft. An overweight landing may be necessary during an emergency and can be survivable, although it may require an inspection afterwards. Some simulator damage models treat the limit more abruptly.
Why can a smooth-looking landing still break the gear?
A visually gentle touchdown can still contain a sharp load spike, sideways movement or an uncommanded gear action. The cockpit view may hide lateral drift, and the vertical-speed indicator lags too much to be treated as a precise touchdown-load instrument.
- If it follows one aircraft: suspect that aircraft’s flight model, saved wear state, failure system or configuration.
- If it follows one runway position: suspect a scenery seam, raised collision surface or duplicate airport package.
- If the gear lever moves: check for duplicate keyboard, controller or throttle-quadrant bindings. Some basic models do not reproduce weight-on-wheels retraction protection accurately.
- If it appears only in replay: check whether the simulator recorded actual damage. Replay interpolation can produce a visual gear animation that did not occur during the live landing.
- If every aircraft is affected: inspect global realism, crash-detection and structural-damage settings.
Gear-collapse animation also varies by simulator and aircraft. One model may visibly fold a leg, another may display a failure notice, and another may simply end or reset the flight.
Does landing too fast collapse the gear?
Excess airspeed does not normally collapse the landing gear by itself, but it creates conditions that can. A fast approach encourages floating, long landings, porpoising and attempts to force the aircraft onto the runway; very high wheel speed can also exceed an aircraft-specific tyre limitation.
Use the aircraft’s weight-adjusted reference or target speed rather than a generic number. Applying full brakes or sharp nosewheel steering immediately after a fast touchdown can add another damaging load.
How can I prevent landing-gear collapse?
The best prevention is a stable, correctly configured approach followed by a low-drift touchdown within the aircraft’s limits.
- Check mass and configuration. Verify the landing weight, flap setting and aircraft-specific approach speed before final approach.
- Confirm the gear indication. On retractable-gear aircraft, check for a positive down-and-locked indication rather than relying only on the lever position or an external view.
- Go around when unstable. Do not rescue an approach with large pitch, power or bank changes close to the runway.
- Control the final descent. Reduce the sink rate without ballooning or stalling, and do not push the aircraft onto the runway. Our guidance on controlling approach speed, flare and touchdown rate addresses the common technique errors.
- Remove sideways motion. In a crosswind, align the wheels with the runway and prevent drift at touchdown. The correct control sequence is covered in our crosswind touchdown and de-crab guidance.
- Protect the roll-out. Lower the nosewheel under control, brake progressively and avoid high-speed turns.
- Test repeatable failures. Retry with a default aircraft at a default airport. This quickly separates a technique problem from an aircraft or scenery fault.
What should I do after a simulated gear collapse?
After a simulated collapse, bring the throttles to idle, maintain the runway heading with whatever control remains and avoid abrupt braking that could worsen the slide. Once stopped, secure the engines and systems using the aircraft’s checklist.
If the problem is detected before landing, do not repeatedly cycle the gear unless the approved abnormal checklist calls for it. Plan the touchdown, notify simulated ATC where applicable and follow the priorities for making a controlled emergency landing.
For a real aircraft, simulator guidance is not a substitute for the approved flight manual, emergency checklist, ATC instructions or operator procedures.