King Air C90 E90
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Flight Instructor
Flight Crew Last 90 Days 90; Flight Crew Total 8700; Flight Crew Type 3000
Troubleshooting
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Weather / Turbulence; Inflight Event / Encounter VFR In IMC
Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Overcame Equipment Problem; Flight Crew Executed Go Around / Missed Approach
Aircraft; Weather; Human Factors
I was the single Pilot of a flight in my King Air flying passengers from under VMC conditions with VFR flight following. The conditions were night; VMC with a ceiling at 4600 feet AGL and visibility 6 miles.  I was handed off to approach then ZZZ tower who then cleared me to land; but asked for a 3 mile from ZZZ report.  While in VMC conditions; I lowered my gear at approximately 7000 feet MSL and 5 miles and from ZZZ with the runway in sight.  I did not receive all three green 'gear down' annunciators.  I informed ZZZ tower that I had to go around.  As I went around; I had to climb for terrain clearance.  As I began to trouble shoot the problem; I entered into freezing rain.  The rain formed sheets of ice on my windscreen which disabled my forward visibility and thus my ability to maintain VFR.  I immediately requested an instrument clearance from tower and climbed out on radar vectors per their instructions.  As I began my climb into VMC conditions; I began to develop large amounts of mixed rime and clear ice which my anti ice and deice systems could not keep up with.  I had time to determine that the omission of the one landing gear annunciator; was caused by a set of burned out bulbs.  I had spares on board and quickly changed them out.  The three green gear annunciators worked indicating gear was indeed down at this point. I flew the ILS 12 approach into ZZZ without any further problems.  My airplane was 8 days past its 24 month pitot/static and transponder check.  I have subsequently had the 24 month check on these systems 4 days later.  The systems checked out fine with no errors; large adjustments or repairs.
King Air pilot experiences two green lights and a blank indicator when the gear is extended for landing. A go-around is initiated and while troubleshooting freezing rain is encountered requiring an IFR clearance and vectors for an approach. The gear indicator bulbs are changed and a normal landing ensues.