UNAUTH PENETRATION OF CLASS D AIRSPACE.

Narrative

FLT BEGAN AT SAC WITH FLT FOLLOWING DOWN TO TRAVIS. TWR HDOF TO SAC APCH/DEP NORMAL. HDOF TO TRAVIS APCH NORMAL. ADVISED TRAVIS APCH OF INTENTIONS TO FLY TO TRAVIS AIR PARK VICINITY FOR AERIAL LOOK AT PLACE OF BUSINESS LOCATED JUST W OF TRAVIS AIR PARK. TRAVIS APCH GAVE ME NEW FREQ. AFTER CONTACT WITH NEW CTLR HE ASKED IF I WAS GOING TO NUT TREE 045. I REPLIED NEGATIVE AND TOLD HIM MY INTENTIONS. SHORTLY THEREAFTER HE TERMINATED FLT FOLLOWING AND GAVE ME A NEW FREQ TO CONTACT TRAVIS APCH FOR FURTHER ASSISTANCE. ON CALL UP ON THE NEW FREQ I IDENTED MYSELF BY N NUMBER AND SHE RESPONDED WITH 'N' NUMBER; STANDBY. I CONTINUED FLT ON INTO THE CLASS D THINKING THAT I HAD ESTABLISHED CONTACT AS SHE HAD GIVEN MY NUMBER IN FRONT OF THE STANDBY. AS I GOT CLOSER TO THE AIR PARK I ASKED FOR A REQUEST AND WAS TOLD TO STANDBY ONCE AGAIN. ABOUT 2 MINS LATER I ASKED FOR REQUEST AGAIN AND SHE RESPONDED 'UNABLE - REMAIN CLR OF CLASS D AIRSPACE.' AFTER A SHORT PAUSE SHE SAID 'OR CONTACT TWR ON FREQ......' AT THIS POINT I WAS ABOUT A MI AND A HALF INSIDE THE CLASS D RING. REALIZING THAT SHE MIGHT BE THINKING SHE HAD NOT ESTABLISHED CONTACT WITH ME; I MADE AN IMMEDIATE 90 DEG R TURN AND HEADED OUT OF THE CLASS D AIRSPACE; AS QUICKLY AS POSSIBLE. I RESPONDED THAT I WOULD STAY CLR OF THE CLASS D AND THEN TRIED TO CONTACT TRAVIS TWR ON THE FREQ SHE GAVE ME. I WAS UNABLE TO MAKE CONTACT AND WAS CLR OF THE CLASS D SO I TURNED BACK TO THE N AND LANDED AT NUT TREE. CONTRIBUTING FACTORS: HEADSET/INTERCOM NOT FUNCTIONAL. WAS USING ACFT SPEAKER AND HAND MIKE FOR COMS. ONE EARLIER CTLR HAD ASKED IF I HAD HEARD HIM ON A PREVIOUS XMISSION; I HAD NOT. PLT COMPLACENCY: I HAD DONE AERIAL OBSERVATIONS OF THE AREA HERE ON 2 PREVIOUS OCCASIONS WITH THE CTLRS VERY HELPFUL AND ACCOMMODATING AND WAS MENTALLY UNPREPARED FOR THE SEQUENCE OF EVENTS THAT UNFOLDED ON THIS FLT.