A HAWKER XP400 WAS DISPATCHED WITH THE INCORRECT TAIL NAV LIGHT INSTALLED. INCORRECT UNIT INSTALLATION APPROVED BY MAINT CTL.

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A TECHNICIAN ON MAR/THU/05 PERFORMED A POSTFLT INSPECTION ON A HAWKER 400XP; HE FOUND THE TAIL NAV LIGHT TO BE INOP. HE CALLED FBO MAINT TO ORDER THE PART. ON MAR/FRI/05 THE PART ARRIVED AT ZZZ AT XA30. I LOOKED AT THE PART NUMBER OF THE SVCABLE PART SENT; IT WAS X. THE PART EFFECTIVE FOR THAT ACFT THAT WAS ORDERED WAS NOT SENT. I CALLED MAINT CTL TO LET THEM KNOW THAT THE PART I RECEIVED WAS THE WRONG PART NUMBER. HE SAID HE WOULD GET BACK TO ME AFTER HE TALKED TO THE HAWKER REPRESENTATIVE. WHILE WAITING FOR THE CALL FROM MAINT CTL; I CALLED THE COMPANY X REPRESENTATIVE TO LET HIM KNOW ABOUT THE PROB WITH THE PART. MAINT CTL CALLED THE MAINT CTL; THEN CALLED ME BACK LATER AND SAID IT WAS OK TO INSTALL THE LIGHT. I INSTALLED THE LIGHT IN ACCORDANCE WITH HAWKER 400XP MAINT MANUAL AND THE INSTALLATION GUIDE FOR THE LIGHT FROM COMPANY Y. THE LIGHT OPS CHKED GOOD. WHEN FAXING PAPERWORK TO THE RETURN TO SVC DEPT; THEY CALLED ME AND SAID THEIR COMPUTER WOULD NOT RELEASE THE ACFT DUE TO THE PART NUMBER FROM THE LIGHT INSTALLED. I TOLD THE RETURN SVC PERSONNEL I WAS TOLD IN THE MORNING IT WAS EFFECTIVE FOR THE ACFT FROM MAINT CTL PERSONNEL; THE HAWKER REPRESENTATIVE; AND THE COMPANY X REPRESENTATIVE. THE RETURN TO SVC PERSONNEL SAID THAT HE WAS GOING TO CALL THE HAWKER REPRESENTATIVE; AND THE COMPANY X REPRESENTATIVE. THE RETURN TO SVC PERSONNEL SAID THAT HE WAS GOING TO CALL THE HAWKER REPRESENTATIVE TO VERIFY THE PART NUMBER OF THE LIGHT AND LET THEM KNOW THAT THEIR COMPUTER WOULD NOT ACCEPT THE PART NUMBER OF THE LIGHT FOR THE ACFT TO BE RELEASED. THE RETURN TO SVC PERSONNEL CALLED ME BACK ON MAR/FRI/05 TELLING ME THE ACFT WAS RELEASED. THE ACFT TAIL NAV LIGHT WAS CHANGED THE FOLLOWING WK WITH THE CORRECT EFFECTIVE PART.