A B767-400 DURING A EMER TRAINING DRILL AN EMER ESCAPE SLIDE FAILED TO DEPLOY DUE TO INCORRECT INSTALLATION.

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DURING FLT ATTENDANT TRAINING; A MINI-EVAC DRILL WAS PERFORMED. ON THE FIRST ATTEMPT; A FLT ATTENDANT OPENED A DOOR MARKED 'FIRE;' MAKING A REPEAT OF THE DRILL NECESSARY. THE MAINT SUPPORT CREW WAS GIVEN ABOUT 2 1/2 HRS TO REPLACE THE 5 SLIDES; RESTOW THE EMER EQUIP USED; POLICE THE CABIN; AND PREPARE THE ACFT FOR THE SECOND TEST. THE ACFT WAS IN A NON AIR CONDITIONED HANGAR; AND THE CABIN WAS ABOUT 95 DEGS F. WHEN THE #1 L SLIDE WAS REPLACED; THE GIRT BAR WAS LEFT STOWED ON THE SLIDE PACK; RATHER THAN PROPERLY INSTALLED ON THE GIRT BAR CARRIER. THERE WERE 4 OR 5 PEOPLE INVOLVED IN THE INSTALLATION; AND NONE NOTICED. THE REPLACEMENT WAS PERFORMED USING AMM PROCS; AND WAS ENTERED IN THE ACFT LOGBOOK. DURING THE SECOND DRILL; THE #1L DOOR WAS OPENED; AND THE SLIDE DID NOT OPERATE; SO THIS DRILL WAS ALSO RULED A 'FAIL' BY THE FAA. THE SLIDE WAS MADE SVCABLE BY PLACING THE GIRT BAR INTO THE CARRIER. THE ADDED PRESSURE OF TIME; TEMP; AND FEELING 'UNDER THE GUN' ALL WERE MAJOR FACTORS IN THE FAILURE TO NOTICE THE GIRT BAR POS. IF THE SLIDE REPLACEMENT HAD BEEN PERFORMED ON JOB-INSTRUCTION CARDS; THERE WOULD HAVE BEEN A QUALITY CTL INSPECTOR INVOLVED. THE ON-SITE FAA PERSONNEL GAVE THE INDIVIDUALS INVOLVED A 'SEVERE TALKING TO' REGARDING POSSIBLE FINANCIAL PENALTIES AS WELL AS LOSS OF LIFE; ETC. I AM SURE THE INDIVIDUALS INVOLVED WILL NEVER MAKE THAT PARTICULAR MISTAKE AGAIN. THE THIRD DRILL WAS ALSO A FAILURE; DUE TO A FLT ATTENDANT OPENING THE DOOR MARKED 'FIRE' (AGAIN!). I SHOULD NOTE THAT EACH FLT ATTENDANT CREW HAD BEEN SEQUESTERED AND DID NOT KNOW WHAT THE OTHER CREWS HAD DONE.