POWRACHUTE Airwolf 912
Oconto, WI — June 30, 2011
Event Information
| Date | June 30, 2011 |
| Event Type | ACC |
| NTSB Number | CEN11CA453 |
| Event ID | 20110706X23910 |
| Location | Oconto, WI |
| Country | USA |
| Coordinates | 44.86833, -87.96667 |
| Highest Injury | SERS |
Aircraft
| Make | POWRACHUTE |
| Model | Airwolf 912 |
| Category | PPAR |
| FAR Part | 091 |
| Aircraft Damage | SUBS |
Conditions
| Light Condition | DAYL |
| Weather | VMC |
Injuries
| Fatal | 0 |
| Serious | 1 |
| Minor | 1 |
| None | 0 |
| Total Injured | 2 |
Event Location
Probable Cause
The powered parachute pilot's decision to execute an in-flight full-flare which resulted in exceeding the angle of attack capabilities of the parachute wing, and subsequent inadvertent stall.
Full Narrative
The powered parachute was on its third flight, and was carrying the pilot and a passenger. The pilot stated that a normal takeoff was performed. During the flight, the pilot elected to perform an in-flight flare maneuver. The maneuver was similar to a flare used for landing except that it was performed at a higher altitude. The first in-flight flare was performed and released, and the powered parachute recovered. Another in-flight flare was performed and released more slowly, and the parachute stalled. The pilot stated that all the cells of the parachute were open and he applied full throttle. The parachute remained open and slightly back from vertical. It stayed in this condition until the powered parachute struck the ground. Federal Aviation Administration publication "FAA-H-8083-29 - Powered Parachute Flying Handbook" states that powered parachutes have two basic flight controls; steering controls and throttle. The throttle controls thrust and therefore controls altitude for climbing and descending, but does not measurably affect airspeed. Powered parachutes fly at a relatively constant airspeed and angle of attack for normal flying conditions. The handbook also states that, although a powered parachute wing is resistant to stall, conditions that can contribute to a stall include a large increase in wing drag as experienced during a full-flare, and a quick full RPM throttle input, creating a climbing dynamic pendulum effect loading the wing. It also states that a full-flare is normally used and recommended only for landings. The damage to the powered parachute included bending of the cart structure, engine mounting structure, and propeller shroud tubing.
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.