A B737-400 LOGBOOK WAS INSPECTED BY AN FAA ACI AND FOUND NO SIGNOFF IN THE AIRWORTHINESS BLOCK. A RECHK OF THE PAPERWORK AT THE DOWNLINE STATION VERIFIED SIGNOFF BUT WHITE LOG PAGE DID NOT COPY ONTO SHEET REMAINING IN LOG. AN ONGOING PROB.

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ON AUG/XA/97 AT APPROX XA30; I SIGNED OFF A 'TRANSIT CHK' ON ACR ACFT YYY. THE AIRWORTHINESS BLOCK WAS SIGNED OFF THEN ALSO. I ENTERED THE INFO INTO THE COMPUTER; MARKED THE YELLOW (ORIGINAL) LOGSHEET FOR SUCH ENTRIES; PULLED THE YELLOW SHEET FROM THE LOGBOOK; AND ADVANCED TO THE NEXT YELLOW LOGSHEET. THE LOGBOOK WAS RETURNED TO THE ACFT FOR AN XB50 DEP FROM ZZZ TO XYZ. THE LOG PAGE I PULLED OUT OF THE LOGBOOK WAS PLACED WITH MY COMPLETED TRANSIT CHK PAPERWORK WHERE THE LEAD MECH DOUBLECHKS PAPERWORK; THEN THE YELLOW LOGSHEET IS FAXED TO ACR RECORDS IN XYZ. THEN THE PROB AROSE WHEN ACFT ARRIVED IN XYZ AND THE FAA MET IT FOR A RAMP INSPECTION. UPON INSPECTING THE LOGBOOK; THE WHITE COPY PAGE DID NOT REFLECT THE AIRWORTHINESS BLOCK BEING SIGNED OFF. ACR USES A 'CARBONLESS COPY' TYPE LOGBOOK. THE COPY PAGE (WHITE) DID NOT PICK UP THE SIGNOFF. THE ORIGINAL LOG PAGE HAD THE AIRWORTHINESS SIGNED OFF. MORE CONFUSION CAME ABOUT WHEN THE FAA WANTED TO SEE THE FAXED COPY. ACFT RECORDS 'COULDN'T FIND' THEIR COPY OF THE LOG PAGE. ZZZ WAS CALLED AND THE ORIGINAL LOGSHEET WAS TAKEN OUT OF COMPANY MAIL AND REFAXED TO XYZ TO REVIEW. IT IS MY KNOWLEDGE THAT AT THIS TIME THE FAA IS NOT SATISFIED WITH THE CHAIN OF EVENTS AND HAS THIS MATTER UNDER REVIEW. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THIS LOGBOOK WHITE SHEET IS A PROB BECAUSE ANY WORK OR CHKS ACCOMPLISHED ON THE AIRPLANE IS ENTERED ON THE WHITE LOGBOOK SHEET AND THEN WHEN ALL THE ENTRIES ARE COMPLETE; THE WHITE SHEET IS TORN FROM THE LOGBOOK. THE RPTR SAID ANY ENTRY ON THE WHITE SHEET IS SUPPOSED TO BE COPIED ONTO THE YELLOW SHEET UNDERNEATH AND REMAIN IN THE LOGBOOK -- THIS DOES NOT ALWAYS HAPPEN. THE RPTR STATED THE LOGBOOK IS CALLED A CARBONLESS COPY TYPE LOGBOOK. RPTR ADVISED IT WAS LATER PROVED THE AIRWORTHINESS BLOCK WAS SIGNED.