AN ATX C402 FAILS TO PASS A RAMP CHK BY THE FAA BECAUSE OF IMPROPER CARGO NET RESTRAINT SYS.

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UPON PARKING THE ACFT I WAS CONFRONTED BY THE FAA AND ADVISED THAT I DIDN'T HAVE THE PROPER CARGO NET APPARATUS. I HAVE SINCE CORRECTED TO THE FAA SPECS HOWEVER; THE TYPE OF RESTRAINTS AND SYS OF SECURING THOSE RESTRAINTS IS VERY AMBIGUOUS OR AT LEAST A VERY GREY AREA. SUPPLEMENTAL INFO FROM ACN 320430: AFTER COMPLETING A PART 135 FREIGHT HAUL I WAS CONFRONTED ON THE GND BY A REPRESENTATIVE OF THE FAA. AFTER INSPECTING MY ACFT; I WAS INFORMED BY THE FAA OFFICIAL THAT (HE THOUGHT) MY CARGO NETTING SYS WAS NOT AN APPROVED RESTRAINING DEVICE FOR THE PARTICULAR ACFT THAT I WAS FLYING. THIS CAME AS A TOTAL SHOCK TO ME BECAUSE AS FAR AS I KNEW I WAS IN TOTAL COMPLIANCE WITH 135 REGS. WHETHER THE FAULT OF MY EMPLOYER WHO SUPPLIES THE ACFT WITH THE NET OR MYSELF FOR NOT FULLY UNDERSTANDING THE RESTRAINING SYS; I FEEL THIS WAS AN HONEST AND 100 PERCENT UNINTENTIONAL MISTAKE. HOWEVER; I DO FEEL COMPELLED TO RECORD THIS IN YOUR FILES. CORRECTIVE ACTION HAS BEEN MADE ON MY PART SINCE THIS ENCOUNTER.