What was found
(CAN) A/C PICKED UP A 15,000 LB LOAD OF LOGS. PILOT MADE A LT PEDAL TURN TO DEPART FROM LOGGING CUT BLOCK & LOWERED COLLECTIVE TO DESCEND TO LOG LANDING. CREW HEAR A SWOOSH SOUND AT WHICH TIME NR 2 ENG N1 UNDER-SPEED WARNING SOUNDED & WARNING LIGHTS ILLUMINATED INDICATING A SOFT STALL CONDITION. CREW EXECUTED AN IN-FLT SHUTDOWN & MOTORING OF SUBJECT ENGINE TO PREVENT AN OVER-TEMPERATURE CONDITION. WITH NR 2 ENG SHUTDOWN PROCEDURES COMPLETED A/C CONTINUED TO LOG LANDING & RELEASED ITS LOAD & RETURNED TO SERVICE AREA & MADE AN UNEVENTFUL SINGLE ENG LANDING. COMPLETE INSP OF ENG & ITS RELATED CONTROL LINKAGES REVEALED NOTHING ABNORMAL. ENG FUEL FILTER WAS INSPECTED FOR CONTAM.