INFLT ENG SHUTDOWN.

Narrative

WHILE IN TURBULENT IMC CONDITIONS AT 17000 FT MSL ON IFR FLT PLAN FROM SMO TO APA ON MAR/SAT/95; LOST PWR ON R ENG. CONDITIONS AT THE TIME OF STOPPAGE WERE: IMC CONDITIONS; TURBULENT (MODERATE) AIR; MODERATE TO HVY MIXED ICE. NOTIFIED ZDV AND RECEIVED RADAR VECTORS TO THE NEAREST ARPT; GVD. I SECURED THE R ENG AND SELECTED ALTERNATE AIR FOR THE L ENG (ALTERNATE AIR IS SUPPOSEDLY AUTOMATIC). ATTEMPTED RESTART OF R ENG ON ALTERNATE AIR. STARTER SOLENOID WOULDN'T ENGAGE. STABILIZED THE ACFT AND MADE GRADUAL DSCNT TO ABOUT 14000 FT WHERE I BROKE OUT OF THE CLOUDS. ACFT WAS CARRYING A SIGNIFICANT AMOUNT OF ICE ON THE WINGS. PITOT HEAT; WINDSHIELD HEAT; PROP HEAT AND DEFROSTER WERE FULL ON PITOT SYS FROZEN - NO AIRSPD (INDICATOR ACTED AS ALTIMETER). MADE VISUAL ACQUISITION OF GUC CANCELED IFR FLT PLAN WITH ZDV. ESTABLISHED 2 WAY RADIO COM WITH GUNISSON CTAF. ATTEMPTED TO LOWER LNDG GEAR - DID NOT GET DOWN AND LOCKED INDICATION UNTIL JUST BEFORE THRESHOLD. MADE A HIGH AND FAST APCH TO RWY 24 SINGLE ENG APCH; UNUSABLE AIRSPD INDICATOR; UNCERTAIN GEAR INDICATION. LANDED SUCCESSFULLY AND WITHOUT FURTHER INCIDENT. THIS INCIDENT OCCURRED BECAUSE I DEVIATED FROM MY FILED FLT PLAN BY ACCEPTING A ZDV VECTOR FOR DIRECT TO THE LARKS 1 STAR. BY ACCEPTING THIS OFFER; I FLEW OVER MOUNTAINOUS TERRAIN INTO KNOWN IMC CONDITIONS. AFTER DETERMINING THE SEVERITY OF THE WX; I CONTINUED FURTHER INTO THE CONDITION RATHER THAN DOING A 180 DEG TURN OR ASKING FOR A DEV. ZDV WAS AWARE OF TURB AND HAD GIVEN ME AN ALT BLOCK OF 17000-18000 FT TO ACCOMMODATE THE TURB AND ICE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATES THAT THE AZTEC HAS AN AUTOMATIC ALTERNATE AIR DOOR THAT FAILED TO CLOSE. THIS ALLOWED THE ENG INDUCTION SYS TO ICE UP; CHOKING THE ENG. IT RAN PERFECTLY THE NEXT DAY. THE STARTER IS AN ONGOING PROB WITH THIS PARTICULAR ENG. THE STARTER MOTOR TURNS PROPERLY. THE RPTR REALIZES HOW LUCKY HE WAS.