PLT OF ATX DURING RAMP CHK WITH FAA INSPECTOR IN ATTENDANCE TIGHTENED A SCREW IN THE ACFT TAIL CONE. RPTR NOW CONCERNED THAT FAA WILL MAKE AN ISSUE OF ACFT REPAIR WITHOUT CERTIFICATION BY MECH.

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I WAS RAMP CHKED AT THE ABOVE NOTED TIME AND PLACE BY FAA INSPECTOR OF THE LOS ANGELES FSDO. WHILE ACCOMPANYING ME ON THE PREFLT INSPECTION; HE NOTICED A LOOSE SCREW IN THE AFT TAIL CONE ASSEMBLY. AFTER POINTING OUT THE DISCREPANCY TO ME I TIGHTENED THE LOOSE SCREW WITH MY FUEL TESTER/SCREW DRIVER. AFTER TALKING TO MY COMPANY ABOUT THE AFOREMENTIONED INCIDENT; I REALIZED I WAS PROBABLY IN VIOLATION OF REGS FORBIDDING ANYONE NOT A LICENSED MECH TO CORRECT DISCREPANCIES. I WOULD ATTRIBUTE THIS ERROR TO A LACK OF EXPERIENCE IN PART 135 ACR OPS. MY AUTOMATIC; COMMON SENSE REACTION IN 6 YRS OF AVIATION INCLUDING 2000 FLYING HRS WAS TO TIGHTEN A LOOSE SCREW ON THE PREFLT. TO CORRECT FURTHER OCCURRENCES OF THIS TYPE OF VIOLATION; I SUGGEST AN EXCEPTION BE MADE FOR INSTANCES WHERE NO REPAIR IS ACTUALLY BEING MADE; THAT THE PLT BE ALLOWED TO CORRECT THESE MINOR DISCREPANCIES. EITHER THAT OR ANOTHER CLAUSE WRITTEN INTO THE REG THAT MAKES IT MORE CLR THAT AIRMEN ARE ABSOLUTELY FORBIDDEN TO CORRECT ANY DISCREPANCIES.