PAX MASKS DROP ON ACR ACFT DUE FLC FAILING TO TURN ON PRESSURIZATION PACKS.

Narrative

THE ACFT FAILED TO PRESSURIZE. WE TOOK OFF OUT OF CINCINNATI INTL ARPT AND AT 10000 FT REALIZED SOMETHING WAS WRONG WITH THE PRESSURIZATION. WE STOPPED OUR CLB AND BEGAN A DSCNT RUNNING THROUGH OUR CHKLISTS AND LEVELING OFF AT 10000 FT. THERE WAS NO EMER DECLARED AND EVERYONE WAS FINE. THE OXYGEN MASKS DID DEPLOY INFLT. AFTER GOING THROUGH ALL THE CHKLISTS WE REALIZED THE PACKS WERE STILL LEFT OFF. WE TURNED THEM ON AND EVERYTHING WENT BACK TO NORMAL. THERE WAS NO INJURIES AND NO DAMAGE TO THE ACFT EXCEPT FOR DEPLOYMENT OF THE OXYGEN MASKS. THE ACFT WAS RECONFIGURED DIFFERENTLY THAN WHAT WAS BRIEFED AND THE PACKS WERE MISSED AS THEY ARE NOT IN THE CHKLIST. SUPPLEMENTAL INFO FROM ACN 463328: ACFT AIR SUPPLY SET UP BY FO AS AN APU INOP SIT AFTER BRIEFED ON USING APU AIR FOR THE AIR SUPPLY. FO UNABLE TO STOP CLB BEFORE 13000 FT AND PAX OXYGEN MASK DEPLOYED. AFTER COMPLETION OF CHKLIST NOTICED THAT #1 AND #2 PACKS WERE NOT ON. TURNED PACKS ON AND PRESSURIZATION WAS NORMAL. FIRST FACTOR THAT MUST HAVE HAD AN EFFECT ON THE SIT WAS THE FO SETTING UP THE AIR SUPPLY NOT AS BRIEFED. THE CHKLIST; SPECIFICALLY THE AFTER TKOF CHKLIST; DOES NOT HAVE THE PACKS REFERRED TO.