Robinson R22 Beta II
Flagstaff, AZ — September 24, 2008
Event Information
| Date | September 24, 2008 |
| Event Type | ACC |
| NTSB Number | SEA08CA208 |
| Event ID | 20081017X45057 |
| Location | Flagstaff, AZ |
| Country | USA |
| Coordinates | 35.13833, -111.67111 |
| Highest Injury | NONE |
Aircraft
| Make | Robinson |
| Model | R22 Beta II |
| Category | HELI |
| FAR Part | 091 |
| Aircraft Damage | SUBS |
Conditions
| Light Condition | DAYL |
| Weather | VMC |
Injuries
| Fatal | 0 |
| Serious | 0 |
| Minor | 0 |
| None | 1 |
| Total Injured | 0 |
Event Location
Probable Cause
The pilot's decision to attempt a takeoff in a high density altitude high gross weight condition that exceeded the takeoff performance capability of the helicopter. The pilot's failure to maintain adequate rotor rpm was also causal. Contributing factors were the high density altitude and the uneven high elevation terrain.
Full Narrative
The pilot reported that due to the density altitude and the weight of the helicopter, he could not gain sufficient airspeed during the takeoff to climb. As the helicopter approached a tree line he initiated a left turn to avoid the trees after receiving a "low rotor" rpm warning. The pilot lowered collective and added throttle just before impacting rough, uneven terrain, which resulted in substantial damage to the helicopter. The pilot stated, "…it [the helicopter] was just too heavy and it was too hot, and the terrain was not level for a run on landing." The density altitude at the time of the accident was calculated to be 10,612 feet.
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.