Small Aircraft; Low Wing; 1 Eng; Fixed Gear
Flight Crew Instrument; Flight Crew Private
Flight Crew Last 90 Days 25; Flight Crew Total 175; Flight Crew Type 169
Situational Awareness
Aircraft Equipment Problem Less Severe
Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport
Aircraft
Once on departure from Runway 9 at TJIG; the Tower instructed me to maintain runway heading for other traffic and once I had the traffic in sight report it and turn west-bound. Once I reported the traffic; radio one started to fail. First I checked my headsets; they were working properly. I turned to the second radio but it also was failing.  I checked the circuit breaker but it did not reset and also checked the radio master breaker; but it did not reset. I turned on the radio master switch; but both radios; the GPS; and the transponder failed to turn on so I couldn't squawk 7600. All this procedure was done over TJIG airspace. I turned back to the airport at an altitude of 800 FT rocking my wings and turning on-off my landing lights; so the Tower could see me and point me with the light gun to land. The airport light gun was not working properly and also I couldn't see the light gun due to the impaired visibility of the sunshades of the Tower. I watched the landing traffic which was a King Air 350 and a departing Piper Arrow. Once I saw the airport was clear after turning for two laps I did a left short approach to Runway 9 and landed safely. Once I exited the runway via B3 Taxiway still the light gun was not working properly and also visibility was minimal due to the sunshades; but I saw a light bit of light and taxied back to the Ramp via B Taxiway. Once I turned off the engine an Airport Authority Officer came by and wrote the report of the incident and I called Isla Grande Tower (TJIG) and explained what happened and the Controller told me that there wasn't any problem and that the light gun was not working properly.
General aviation pilot reports radio failure shortly after takeoff possibly caused by electrical failure. Flight returns to the pattern; flashing landing lights and rocking wings before landing after two circuits. Pilot is informed after landing that the light gun in the Tower is not working properly.