C421 pilot reported a loss of engine power in cruise due to a failed throttle cable.

Narrative:

I was cruising at 7;000 ft MSL in a cessna C421 when the plane violently yawed to the right. I immediately applied full power; full propellers and full fuel to both engines. I banked 5 degrees into the good engine and applied left rudder as I was trained to do. I identified the engine with power loss as the right engine. The engine was only producing 24 inches of manifold pressure while the left engine was producing all 40 inches of manifold pressure. I then called center ATC facility and [reported condition]. I checked my oil pressure and oil temperature gauges and they showed normal operation. I then tried to slightly decrease power on the right engine and then add full power back. 24 inches of manifold pressure was as much as the engine would produce. I had enough altitude and airspeed to safely navigate to the nearest airport. ATC did a great job pointing out a field approximately 6 miles from my location and they gave me vectors to land at ZZZ. Upon a smooth touchdown at ZZZ the right engine completely quit. I was able to taxi the aircraft to the ramp on one engine with no issue. I checked the fuel quantities once on the ground and found I had approximately 70 gallons still available. A mechanic close to the field came to look at the aircraft and he thinks it could be a bad throttle cable.

Original NASA ASRS Text

Title: C421 pilot reported a loss of engine power in cruise due to a failed throttle cable.

Narrative: I was cruising at 7;000 FT MSL in a Cessna C421 when the plane violently yawed to the right. I immediately applied full power; full propellers and full fuel to both engines. I banked 5 degrees into the good engine and applied left rudder as I was trained to do. I identified the engine with power loss as the right engine. The engine was only producing 24 inches of manifold pressure while the left engine was producing all 40 inches of manifold pressure. I then called Center ATC facility and [reported condition]. I checked my oil pressure and oil temperature gauges and they showed normal operation. I then tried to slightly decrease power on the right engine and then add full power back. 24 inches of manifold pressure was as much as the engine would produce. I had enough altitude and airspeed to safely navigate to the nearest airport. ATC did a great job pointing out a field approximately 6 miles from my location and they gave me vectors to land at ZZZ. Upon a smooth touchdown at ZZZ the right engine completely quit. I was able to taxi the aircraft to the ramp on one engine with no issue. I checked the fuel quantities once on the ground and found I had approximately 70 gallons still available. A mechanic close to the field came to look at the aircraft and he thinks it could be a bad throttle cable.

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.

Attributes
ACN	1503861
Time
Date	201712
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Golden Eagle 421
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Throttle/Power Lever
Person 1
Function	Single Pilot
Qualification	Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 87 Flight Crew Total 717 Flight Crew Type 21
Events
Anomaly	Aircraft Equipment Problem Critical