Cessna 210 Centurion / Turbo Centurion 210C; 210D
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 15; Flight Crew Total 2300; Flight Crew Type 800
Time Pressure; Troubleshooting; Workload
Aircraft Equipment Problem Less Severe
Air Traffic Control Issued New Clearance; Flight Crew Diverted; Flight Crew Landed As Precaution; Flight Crew Requested ATC Assistance / Clarification; General Maintenance Action
Aircraft
East of La Veta Pass at 11;500 a discharge on ammeter was noted. Cross checked ammeter with graphic engine monitor and determined no output from alternator. Master switch recycled; all circuit breakers checked; alternator still offline. At this time I was in contact with Denver center on a discretionary code (flight following). Decision made to divert to PUB for maintenance. Decision also made to lower the landing gear to avoid having to lower manually. Gear lowered and depleted remaining power. All avionics went offline including comm/gps/transponder. Separate 'stratus' ADS-B used to show navigation and traffic; plus current conditions at PUB on an ipad. Entered PUB traffic pattern on a downwind leg; observed green light from tower and entered left base for landing while watching for light gun signals and traffic. Taxied to FBO while observing flashing green tower light. Tower indicated they had been informed by Denver Center of our landing at PUB.
C210 pilot reported the complete loss of electrical power due to a failed alternator; and elected to divert to a nearby suitable airport where a successful landing was accomplished.