TEST PLT CONDUCTED TEST FLT OF AN LTT JET ACFT THAT HAD NOT BEEN SIGNED OFF AFTER MAINT FOR FLT.

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I WORK FOR AN ACFT MANUFACTURER. AS PART OF MY RESPONSIBILITIES; I AM REQUIRED TO TEST FLY ACFT IN THE FIELD FOR STALL CHARACTERISTICS AND STALL SPDS AFTER THEY HAVE HAD MAINT WORK DONE TO THE ACFT WING OR STALL WARNING SYS. ON THIS DATE; I ARRIVED AT THE MAINT FACILITY; THE MAINT PERSONNEL ADVISED ME THAT THE ACFT WAS READY FOR THE TEST FLT; I CONDUCTED A STANDARD PREFLT INSPECTION; THEN CONDUCTED THE STALL TEST FLT. A PLT FROM THE MAINT FACILITY SERVED AS COPLT. 1 WK LATER; I WAS CONTACTED BY AN FAA FSDO INSPECTOR WHO ADVISED ME THAT HE HAD BEEN REVIEWING RECORDS AT THE MAINT FACILITY AND FOUND A DISCREPANCY. HE ADVISED ME THAT THE MAINT RELEASE FORM HAD NOT BEEN SIGNED BY THE MAINT PERSONNEL AFTER THE MAINT HAD BEEN PERFORMED ON THE ACFT; AND THEREFORE; I HAD FLOWN THE ACFT IN AN UNAIRWORTHY CONDITION. SINCE I AM REQUIRED TO FLY ACFT AT MANY DIFFERENT MAINT FACILITIES THROUGHOUT THE UNITED STATES; I AM NOT AWARE OF THE INDIVIDUAL MAINT RELEASE PROCS AT EACH FACILITY. I STILL DO NOT UNDERSTAND HOW A PLT IS EXPECTED TO KNOW ALL MAINT FUNCTIONS AND SUPERVISE THAT MAINT PERSONNEL ADEQUATELY FILL OUT ALL THE REQUIRED PAPERWORK; PARTICULARLY WHEN THE PAPERWORK IS INTERNAL TO THE MAINT FACILITY AND IS NOT PART OF THE ACFT MAINT LOGBOOKS. IN THE FUTURE; I WILL BE SURE TO DEMAND TO SEE THE SIGNED MAINT RELEASE WHENEVER I FLY OUT OF THIS MAINT FACILITY.