CAPT OF AN LTT FAILED TO RECORD IN THE ACFT LOG A MAINT DISCREPANCY.

Narrative

ENRTE FROM HUN TO PHL A PROB DEVELOPED WITH A PROP GOVERNOR ON THE L ENG. AS REQUESTED; MAINT MET US AT THE GATE. WE DESCRIBED THE PROB; NOT BEING COMPLETELY SURE OF THE CAUSE; ONLY WHAT HAD OCCURRED. CONSEQUENTLY WE DID NOT MAKE AN ENTRY IN THE MAINT LOG. WE THEN LEFT THE AIRPLANE; WENT TO OPS AND BEGAN THE PROCESS OF CALLING DISPATCH; SCHEDULING; ETC. UPON RETURNING TO THE PLANE THE FAA GREETED US TO ASK WHY THE ACFT WAS BEING REPAIRED WITHOUT AN ENTRY IN THE LOGBOOK. THE INSPECTORS WERE NOT PLEASED SINCE WE HAD NOT FOLLOWED PROCS (MAKING AN ENTRY IN THE LOGBOOK FIRST). AFTER THE INSPECTORS EXPLAINED THE IMPORTANCE OF ENTERING A DISCREPANCY FIRST AND WE ADMITTED OUR OVERSIGHT; ALL WAS WELL. AFTER HAVING COMPLIMENTED OURSELVES ON PERFECTLY FOLLOWING COMPANY PROCS; POSSIBLY PREVENTING A PROP OVERSPD WE COMPLETELY ABANDONED MAINT PROCS. ALTHOUGH NOT A CONCERN OF SAFETY; WE DISCOVERED IT COULD HAVE BEEN A GREAT WAY TO RECEIVE A VIOLATION. IN CONCLUSION; FOLLOW PROCS ON PAPERWORK AS WELL AS FLYING; REGARDLESS OF WHAT HAPPENED DURING THE FLT.