MARK O TREIDEL American Ranger AR-1
Denver, CO — December 16, 2025
Event Information
| Date | December 16, 2025 |
| Event Type | ACC |
| NTSB Number | CEN26LA067 |
| Event ID | 20251222202193 |
| Location | Denver, CO |
| Country | USA |
| Coordinates | 39.78419, -104.53763 |
| Airport | Colorado Air and Space Port Ai |
| Highest Injury | NONE |
Aircraft
| Make | MARK O TREIDEL |
| Model | American Ranger AR-1 |
| Category | GYRO |
| FAR Part | 091 |
| Aircraft Damage | SUBS |
Conditions
| Light Condition | DAYL |
| Weather | VMC |
Injuries
| Fatal | 0 |
| Serious | 0 |
| Minor | 0 |
| None | 1 |
| Total Injured | 0 |
Probable Cause
The pilot’s failure to attain rotor RPM and maintain proper rotor disc angle during takeoff which resulted in a rotor strike with the rudder.
About This NTSB Record
This aviation event was investigated by the National Transportation Safety Board (NTSB). NTSB investigates all U.S. civil aviation accidents to determine probable cause and issue safety recommendations to prevent future accidents.