UPPER LIMIT AVIATION

Operated by Upper Limit Aviation (per NTSB report)

The student pilot’s failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle of attack during an attempted go-around, which resulted in an aerodynamic stall.

Operated by Upper Limit Aviation, Inc. (per NTSB report)

The student pilot’s improper landing flare, which resulted in a hard, porpoised landing.

Operated by Upper Limit Aviation (per NTSB report)

The failure of the pilots to maintain control of the airplane while maneuvering, which resulted in an aerodynamic stall from which they did not recover.

Operated by Upper Limit Aviation (per NTSB report)

The pilots' inaccurate assessment of the snow depth on the landing zone, which resulted in a landing on snow deeper than that for which the helicopter was equipped and led to dynamic rollover.

Operated by Upper Limit Aviation (per NTSB report)

The student pilot's failure to maintain control of the helicopter during the attempted takeoff, and the flight instructor's inadequate supervision of the student pilot.

Operated by Upper Limit Aviation Inc (per NTSB report)

The flight instructor's decision to follow a route over mountainous terrain in conditions that exceeded the helicopter’s ability to maintain terrain clearance.

Operated by Upper Limit Aviation (per NTSB report)

The student’s failure to maintain adequate rotor rpm and the flight instructor’s delayed remedial action, which resulted in a hard landing.

Operated by Upper Limit Aviation (per NTSB report)

The student pilot's inadvertent action of pulling out the engine's mixture control lever to idle cutoff that resulted in a complete loss of engine power.

Operated by Upper Limit Aviation (per NTSB report)

The pilot did not maintain yaw control of the helicopter during a maneuvering hover. Contributing to the accident was the pilot’s lack of experience in the make and model helicopter.

Operated by UPPER LIMIT AVIATION (per NTSB report)

The pilot's improper decision to fly at low altitude while maneuvering in mountainous terrain in a canyon and inadvertently exceeding the climb capability of the helicopter. Contributing to the accident were a high density altitude, mountainous terrain, and a tailwind encountered during the attempted course reversal.

Operated by Upper Limit Aviation (per NTSB report)

The student's improper use of the anti torque pedals during a practice hover autorotation, which resulted in the helicopter rolling over. Additional causes of the accident were the certificated flight instructor's inadequate supervision of the maneuver and delayed remedial action.

Operated by Upper Limit Aviation (per NTSB report)

The pilot's failure to maintain rotor RPM during hover taxi. A contributing factor was the high density altitude weather condition.

Operated by Upper Limit Aviation (per NTSB report)

The pilot's failure to maintain control of the helicopter during the takeoff initial climb, which resulted in an in-flight collision with the ground. A contributing factor was the gusty wind condition.

Operated by Upper Limit Aviation (per NTSB report)

the pilot's failure to maintain aircraft control during initial takeoff climb resulting in an uncontrolled descent and impact with terrain. A contributing factor was the pilot's encounter in settling with power.