What was found
THE PILOT STATES THAT THE AC LIFTED OFF AND BEGAN A CLIMB TO CLEAR OBSTACLES AND UPON REACHING 100 FEET AGL, A DISTINCT CHANGE IN ENGINE SOUND WAS DETECTED ALONG WITH A SLIGHT YAW TO THE RT FROM THE LOSS OF POWER. THE PILOT IMMEDIATELY LOWERED THE COLLECTIVE TO PRESERVE ROTOR RPM AND FORTUNATELY THE RPM STABILIZED AT 365-370 RPM AT A LOWER POWER SETTING. I ELECTED TO SET UP FOR A LOW POWER RUN ON LANDING TO THE PARKING LOT, WE WOULD BE LANDING SHORTLY. AS WE APPROACHED THE GROUND AND AT A SKID HEIGHT OF APPROX. 1-2 FT I APPLIED COLLECTIVE PITCH TO CUSHION THE LANDING, THE ROTOR RPM BEGAN TO BLEED OFF AND THE LOW RPM HORN SOUNDED JUST BEFORE TOUCHDOWN. THE AC TOUCHED DOWN SOFTLY WITH ABOUT A 20 FOOT GROUND SLIDE. THIS WAS AN UNSCHEDULED LANDING THAT WAS THE RESULT OF A FAULTY FUEL CONTROL. THE DEFECTIVE FUEL CONTROL WAS REMOVED AND A SERVICEABLE FUEL CONTROL WAS INSTALLED. GROUND RUN AND FLIGHT CHECKS WERE PERFORMED, NO DEFECTS NOTED. RETURNED AC TO SERVICE.