What I check first: Landing gear rarely breaks only at the screw hole you can see. A hard landing can pull blind nuts, split a plywood plate, crush foam, crack fuselage sides, or loosen the former that carries the mount. I remove the gear and inspect beyond the obvious damage before deciding whether this is a hardware repair or a structural rebuild.
Assess the Damage Before Repairing It
| What you find | What it can mean | Best next step |
|---|---|---|
| Stripped screw hole in sound wood | The mounting plate is solid and undamaged around the hole | Restore the hole using an appropriate structural method and correct fastener |
| Pulled blind nut or insert | Hardware spins, tilts, or has crushed the surrounding plywood | Replace the hardware and repair or replace damaged mounting material |
| Cracked plywood plate | Crack extends through the mount or along the grain | Replace or reinforce the plate so loads reach sound structure |
| Separated former or fuselage joint | The entire mount moves relative to the airframe | Rebuild the joint and inspect connected sides, doublers, and formers |
| Crushed foam mount pocket | Foam has compressed or torn around plastic or plywood parts | Restore the shape and spread loads into sound foam using a suitable method |
| Bent gear causing repeated damage | Mount fails again or the wheels no longer sit evenly | Repair or replace the gear and correct alignment before rebuilding the mount |
Work Through the Repair in This Order
- Remove the gear and clean the area. Take off wheels, fairings, straps, blocks, and doors as needed. Remove dirt, fuel residue, grass, and loose fragments so the full damage is visible.
- Check alignment before disassembly goes farther. Record wheel position, toe, track, axle height, gear rake, and how the mount sits relative to the fuselage centerline.
- Probe the surrounding structure. Use light hand pressure and good illumination to find cracked formers, loose glue joints, crushed foam, delaminated plywood, enlarged holes, and damaged covering.
- Decide what must be replaced. A tiny damaged hole may be repairable. A split plate, crushed foam pocket, or separated former needs a repair that reaches undamaged material.
- Dry-fit the complete gear system. Temporarily assemble the mount, gear, straps, blocks, and hardware. Confirm wheels and struts clear the structure and the mount does not twist when tightened.
- Restore the load path. Rebuild the mounting plate, rails, formers, doublers, or foam reinforcement so landing loads spread into the airframe. Avoid creating one extremely hard spot surrounded by weak material.
- Install hardware correctly. Use the intended screw type, washers, straps, blind nuts, or inserts. Do not overtighten into wood or plastic, and keep retract mechanisms free of adhesive.
- Load-test and reinspect. Apply moderate hand loads in the directions the gear sees during landing and taxiing. Check for movement, cracking sounds, loose hardware, and changes in alignment.
Do Not Hide a Structural Problem
A neat surface does not prove the original strength, alignment, or load path has been restored. Dry-fit the structure, compare it with undamaged reference points, and make sure loads are carried into sound material. More adhesive is not a substitute for missing or crushed structure.
Common Mistakes
- Filling a stripped hole while ignoring a cracked mounting plate
- Using oversized screws that split the remaining wood
- Making the mount indestructible while leaving the surrounding fuselage weak
- Reinstalling bent gear that will immediately reload the repair
- Covering the area before checking wheel and strut alignment
Before the Airplane Flies Again
- Confirm the repaired structure is straight, secure, and fully cured.
- Check every control direction, hinge, horn, linkage, servo mount, and endpoint.
- Verify the center of gravity and lateral balance with the airplane flight-ready.
- Inspect wiring, batteries, fuel systems, power-system mounts, and rotating parts.
- Perform the manufacturer’s range test after radio or receiver-power work.
- Use a conservative return-to-service flight and land at the first abnormal sound or response.
Related RC Plane Lab Guides
Review adhesive selection, foam and balsa structural repairs, and retract and landing-gear troubleshooting. Return to the RC Airplane Building & Repair Center.
RC Plane Lab provides general educational information. Follow the instructions for your specific airplane, materials, adhesives, covering, engine, motor, batteries, and radio equipment.