Cessna 210 Centurion / Turbo Centurion 210C; 210D
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 40; Flight Crew Total 2070; Flight Crew Type 832
Aircraft Equipment Problem Critical
Air Traffic Control Issued New Clearance; Flight Crew Overcame Equipment Problem; Flight Crew Diverted; General Maintenance Action
Aircraft
I was conducting multiple practice instrument approaches in actual IMC in an aircraft with newly-installed modern glass panel avionics; after having conducted two previous VFR flights on previous days with practice instrument procedures in VMC.While executing the published missed approach procedure for the GPS XY approach; after entering IMC my engine monitor began flashing an alarm for low bus voltage less than 24 VDC. Indeed the alternator had stopped charging leading to the battery supplying all the instrumentation with power. Resetting the alternator failed to bring it back on line.I knew I had only 20 to 30 minutes maximum of power available from the ship's battery. I requested the GPS XY back into ZZZ for a full-stop landing. While executing the approach I turned off the few items I felt I could do without; including the #2 nav/com and all lights.The controller vectored me to the final approach course and I broke out on the GPS XY and landed without further incident.The following day I flew the aircraft under VFR conditions to a repair facility where the alternator; which had failed; was replaced.
The pilot of a C210 reported the loss of the alternator during climb on a missed approach in instrument conditions. A successful landing at the airport was completed.