Accident Briefs: October 2017

Lake Berryessa, California

The commercial pilot departed in the light sport, amphibious airplane during daytime visual meteorological conditions to perform a new employee familiarization flight with the passenger, who the company had recently hired. A witness, who was in a boat on a lake, reported seeing the accident airplane flying about 30 to 50 feet over the water at what appeared to be between 30 to 40 mph. The witness added that, as the airplane passed by his position and entered a nearby cove, which was surrounded by rising terrain on either side and at its end, he heard the engine "rev up and accelerate hard" as the airplane approached the right side of the canyon "in what appeared to be an effort to climb out of" the canyon. Subsequently, the airplane climbed to about 100 feet above the water and entered a left turn as it began to descend before it flew beyond the witness's field of view. The witness stated that he heard the sound of impact shortly after losing sight of the airplane.

Review of recorded data from two separate recording devices installed in the airplane revealed that, about 15 minutes after departure, the airplane started a descent from 3,700 feet GPS altitude. About 7 minutes later, it had descended to 450 feet GPS altitude and turned to a northerly heading, staying over the water between the shorelines. About 46 seconds later, at a GPS altitude of 450 feet and 54 knots indicated airspeed (KIAS), the airplane entered the cove. About 20 seconds later, engine power was increased, and the airplane began to climb while it turned slightly right before initiating a left turn. The airplane reached a maximum GPS altitude of 506 feet before it began to descend. Shortly after, the airplane impacted terrain at a GPS altitude of 470 feet and 66 KIAS. Postaccident examination of the airframe and engine revealed no evidence of any preexisting mechanical malfunctions that would have precluded normal operation.

It is likely that the pilot mistakenly thought the canyon that he entered was a different canyon that led to the larger, open portion of the lake. Additionally, it is likely that, once the pilot realized there was no exit from the canyon, he attempted to perform a 180° left turn to exit in the direction from which he entered. Based upon performance information outlined in the Pilot's Operating Handbook for the accident airplane, the airplane's altitude above the water's surface and its indicated airspeed, and the ridge line elevations in the area adjacent to the accident site, the airplane would have not been able to climb out of the rising terrain that surrounded the area, which led to his failure to maintain clearance from terrain.

Probable Cause: The pilot's failure to maintain clearance from terrain while maneuvering at a low altitude. Contributing to the accident was the pilot's mistaken entry into a canyon surrounded by steep rising terrain while at a low altitude for reasons that could not be determined.

2 Serious

Greenville, Michigan

The private pilot reported that, during the takeoff climb for the personal cross-country flight, he turned the airplane too early and at too low of an altitude to clear the trees ahead. The pilot then turned the airplane to avoid the trees, and it stalled. As he continued to try to maneuver the airplane away from the trees, the airplane entered a secondary stall, descended, and impacted terrain in a vertical attitude. There were no mechanical anomalies with the airplane, engine, or related systems that would have precluded normal operation.

Probable Cause: The pilot's premature turn during the takeoff climb and subsequent turn to avoid trees, which resulted in his exceedance of the airplane's critical angle-of-attack and a subsequent aerodynamic stall.

1 Uninjured

Prosser, Washington

The pilot of the tailwheel-equipped airplane reported that, during an agricultural application flight, about 800 ft into the takeoff roll on a gravel airstrip, he veered the airplane to the right to avoid hay bales that were stacked on the left side of the runway. He added that, as the airplane veered right, the right-wing spray boom encountered tall wheat, and the airplane exited the right side of the runway. Subsequently, the airplane came to rest nose down.

The airplane sustained substantial damage to the left wing.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Probable Cause: The pilot's abrupt maneuver to avoid hay bales during the takeoff roll, which resulted in a loss of directional control.