As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT LANDED AFTER DROPPING PASSENGERS ON SKI RUN. THROTTLE TWIST GRIP DID NOT RESPOND WHEN ROLLED TO IDLE SETTING PRIOR TO ENGINE SHUTDOWN. ACFT WAS FLOWN BACK TO BASE AND ENGINE SHUTDOWN AT HMU INPUT LEVER MANUALLY BY AME. THROTTLE CABLE FOUND BROKEN UNDER FRONT CABIN FLOOR. BREAK FOUND AT LOCATION OF TIGHT RADIUS CURVE IN CABLE ROUTING.