THE RPTR REPACKED 4 OXYGEN MASKS AND CLOSED THE PAX SVC UNIT DOOR WITHOUT LOGGING THE ACTIVITY IN THE LOGBOOK. RPTR LATER FOUND A LOGBOOK WRITE-UP WAS REQUIRED. RPTR STATED THE LNDG WAS FIRM BUT NO WAY UNSAFE.

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I WAS PERFORMING MY DUTIES AS FE ABOARD A FLT ON JAN/SAT/96. THE FO WAS FLYING THE APCH INTO DFW; WE WERE LNDG TO THE N WITH WINDS OUT OF THE NW AT APPROX 300 DEGS AT 15 KTS GUSTING TO 25 KTS. THE LNDG WAS FIRM; BUT IN NO WAY UNSAFE. THE CAPT DID NOT REQUEST A HARD LNDG RPT; AND NO ENTRY WAS MADE IN THE ACFT LOGBOOK. A POST FLT INSPECTION WAS ACCOMPLISHED BY MYSELF; AND RESULTED IN THE FINDING OF SEVERAL OXYGEN MASKS HAD FALLEN FROM THE PAX SVC UNITS IN THE CABIN. A VISUAL INSPECTION WAS PERFORMED ON EACH MASK; AND IT WAS VERIFIED THAT THE VALVE ACTUATOR PIN WAS STILL INSTALLED AND THAT NO FLOW OF OXYGEN WAS FOUND. I CHKED THE OXYGEN PRESSURE INDICATOR ON THE FE PANEL TO SEE IF THERE WAS A DROP IN PRESSURE AND NONE WAS NOTICED. I WAS NOT AWARE THAT THIS TYPE OF MASK DEPLOYMENT REQUIRED AN ENTRY IN THE LOGBOOK. I THOUGHT THIS WAS NECESSARY ONLY WHEN THE MASKS WERE DEPLOYED IN ONE OF THREE WAYS: AUTOMATICALLY -- WHEN THE CABIN ALT REACHES 14000 FT; ELECTRICALLY -- BY POSITIONING THE OXYGEN SYS SWITCH TO THE ON POS; AND MECHANICALLY -- BY PULLING THE MANUAL ACTUATION AND RESET HANDLE TO ON. AFTER READING MY MANUALS AND THE BASIC KNOWLEDGE I HAVE OF THE OXYGEN SYS; I FELT THAT IT WAS OKAY FOR ME TO REPACK THE MASKS INTO THE PAX SVC UNITS AND NOT MAKE A LOGBOOK ENTRY; DUE TO THE TYPE OF DEPLOYMENT AND THE NUMBER OF MASKS THAT HAD FALLEN (4). I APOLOGIZE FOR MY ACTIONS AND WAS NOT AWARE THAT MY FAILURE TO ENTER THIS INCIDENT IN THE LOGBOOK WAS IN VIOLATION OF COMPANY AND FAA REGS.