ACR LGT MADE TKOF BEFORE PASSENGER BRIEFING WAS COMPLETED.

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THIS INCIDENT INVOLVES PRE-DEP PROCS. SPECIFICALLY; THE CABIN CREW WAS UNABLE TO COMPLETE THE REQUIRED PAX SAFETY BRIEFING PRIOR TO THE TKOF ROLL. ALTHOUGH THE TAXI FROM THE GATE TO ACTIVE RWY WAS RELATIVELY SHORT; AMPLE TIME WAS AVAILABLE FOR A NORMAL COURSE OF EVENTS. THE PROB AROSE WHEN A F/A OTHER THAN THE SENIOR F/A ADVISED THE COCKPIT CREW THAT THE CABIN WAS SECURE FOR PUSHBACK. THIS RESULTED IN CABIN ATTENDANTS COMPLETING THE TASK DURING THE TAXI. THE COCKPIT CREW WAS UNAWARE OF THE SITUATION. PRIOR TO TURNING ONTO THE RWY THE COCKPIT ANNOUNCEMENT; SIGNALING THE IMPENDING TKOF; WAS COMPLETED. COCKPIT CHKLISTS WERE COMPLETED AND A NORMAL TKOF ENSUED. SOME TIME AFTER TKOF A CABIN ATTENDANT ADVISED THE COCKPIT CREW THAT THE PRE-DEP BRIEFING HAD BEEN INCOMPLETE. IT APPEARS THAT LACK OF COORD BTWN THE CABIN ATTENDANTS ALLOWED A PREMATURE PUSHBACK. IN ADDITION; THE CABIN ATTENDANTS DID NOT EXERCISE THEIR AUTHORITY TO PREVENT THE TKOF. A FACTOR AFFECTING THE CABIN CREW PERFORMANCE WAS THAT THE SENIOR F/A HAS LESS THAN 6 MONTHS OF LINE SVC. SUPPLEMENTAL INFO FROM ACN 93287: AS 'A' F/A; I CAME ACROSS A BLIND PAX WHOSE CANE WAS JUST SLIGHTLY PROTRUDING INTO THE AISLE. I ASKED HER IF I COULD PUSH IT IN JUST A LITTLE. SHE REFUSED. WHILE I WAS TALKING TO HER THE PLANE WAS MOVING (PUSHBACK). I SAID TO THE 'C' F/A; WHY ARE WE PUSHING BACK? I'M NOT READY TO GO. SHE THEN SAID THAT SHE WAS SORRY AND THAT SHE HAD TOLD THEM WE WERE READY TO GO. THE 'B' F/A TOLD ME THAT AVIATION SAFETY INSPECTOR WANTED TO SEE ME. HE THEN INFORMED ME THAT HE WOULD NEED TO SPEAK WITH MYSELF AND THE CAPT AT THE END OF THE FLT. THOUGH HE WAS NOT OFFICIALLY CHKRIDING US; HE WOULD HAVE TO RPT WHAT HAD HAPPENED. FAA INSPECTOR SHOWED ME HIS ID WHEN HE CAME ON BOARD. EXPECT TO HEAR FROM ACR INSPECTOR; SAME OFFICE. AT THE REQUEST OF THE CAPT I ASKED IF HE WAS CHKRIDING US AND HE SAID NO.