Narrative:

I departed the south ramp on a [published] departure for a tour in a robinson R44. Approx. 1-2 minutes after departure; I experienced what I believed to be a minor torque kick. There was no significant yaw or secondary indications; so I decided to continue the flight. I monitored the aircraft closely and all was normal until approximately 30 minutes into the flight. I slowed down to approximately 20 knots to ensure my passengers got a good photo opportunity.at this point; I made a radio call advising I was exiting [the scenic point]. As I completed the orbit at 2;000 feet; I experienced significant yawing of the aircraft to both sides; vibration and my RPM warning light and horn came on. I immediately entered auto-rotation and made a [priority request] radio call. I turned easterly and auto rotated down the valley searching for a safe landing spot. I noted my engine was still running; at 1;200 feet MSL; I increased throttle to gauge my power levels and noted my engine RPM and rotor RPM needles rejoined indicating full power. This enabled me to reach a grass landing spot. I made a normal approach to the spot; set down with full power and shut down as normal. My colleague was flying [another aircraft] a short distance behind me and had acknowledged my [radio] call. As I touched down; I advised her via radio that myself and the passengers were safely on the ground and requested she contact our operations manager. After I shutdown the engine; stopped the blades and checked there was no fire hazard; I confirmed both my passengers were ok and rang my boss (the operator) to advise her of the situation. She told me to stay where we were and she would be arriving shortly. She arrived approx. 40 minutes later and I flew the passengers back to base in that aircraft. My boss remained to wait for the mechanic to arrive.

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Original NASA ASRS Text

Title: R44 pilot reported an engine malfunction resulted in an off-field landing.

Narrative: I departed the South Ramp on a [published] departure for a tour in a Robinson R44. Approx. 1-2 minutes after departure; I experienced what I believed to be a minor torque kick. There was no significant yaw or secondary indications; so I decided to continue the flight. I monitored the aircraft closely and all was normal until approximately 30 minutes into the flight. I slowed down to approximately 20 knots to ensure my passengers got a good photo opportunity.At this point; I made a radio call advising I was exiting [the scenic point]. As I completed the orbit at 2;000 feet; I experienced significant yawing of the aircraft to both sides; vibration and my RPM warning light and horn came on. I immediately entered auto-rotation and made a [priority request] radio call. I turned easterly and auto rotated down the valley searching for a safe landing spot. I noted my engine was still running; at 1;200 feet MSL; I increased throttle to gauge my power levels and noted my engine RPM and rotor RPM needles rejoined indicating full power. This enabled me to reach a grass landing spot. I made a normal approach to the spot; set down with full power and shut down as normal. My colleague was flying [another aircraft] a short distance behind me and had acknowledged my [radio] call. As I touched down; I advised her via radio that myself and the passengers were safely on the ground and requested she contact our Operations Manager. After I shutdown the engine; stopped the blades and checked there was no fire hazard; I confirmed both my passengers were OK and rang my boss (the Operator) to advise her of the situation. She told me to stay where we were and she would be arriving shortly. She arrived approx. 40 minutes later and I flew the passengers back to base in that aircraft. My boss remained to wait for the mechanic to arrive.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.