The accident happened during an instructional flight in a Piper Cherokee. The CFI was attempting to demonstrate a soft field departure. The CFI taxied to a grass runway and instructed the student pilot to do the takeoff.
The student advanced the throttle. The airplane achieved full power and about half way down the runway reached minimum rotation speed. The CFI noted that the runway began to upslope and the airspeed increased at a reduced rate.
When the airplane reached the top of the slope, airspeed increased to 60 mph and the CFI called out “rotate.” The CFI assisted the student pilot with the rotation.
The climb-out was normal, but the airplane hit a power line approximately 150 feet from the end of the runway, then crashed, seriously injuring the student and CFI. The airplane was substantially damaged.
The NTSB determined the probable cause as the flight instructor’s inadequate supervision of the student pilot during takeoff, which resulted in a collision with a power line.
NTSB Identification: ERA13CA228
This May 2013 accident report is provided by the National Transportation Safety Board. Published as an educational tool, it is intended to help pilots learn from the misfortunes of others.