A FOKKER F100 HAS A NON COMPANY MECH WHO PULLS THE ENG REVERSER CIRCUIT BREAKERS WITHOUT THE FLC KNOWLEDGE. ACFT COMES CLOSE TO GOING OFF END OF LNDG RWY AS REVERSERS WILL NOT DEPLOY.

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UPON LNDG ORD; IT WAS DISCOVERED WE HAD NO REVERSERS. CAPT TOOK CTL OF ACFT WITH OVER 5000 FT OF RWY COVERED WITH SNOW AND ICE. BRAF RPTED. MAX BRAKING WAS NECESSARY TO STOP ACFT. IT TOOK ENTIRE RWY TO STOP ACFT. IT WAS DISCOVERED THAT THE REVERSERS CIRCUIT BREAKERS FOR BOTH REVERSERS WERE OUT. MAINT HAD BEEN PERFORMED AT PVD BY CONTRACT MAINT AFTER ORIGINAL PREFLT HAD BEEN COMPLETED. LIFT DUMPERS HAD TO BE DISCONNECTED FOR COMPLIANCE OF MEL. SUSPECT MAINT PULLED CIRCUIT BREAKERS WITHOUT OUR KNOWLEDGE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE PROB STARTED IN PVD. WHEN THE SPOILER HAD TO BE WORKED UPON; THE ENG REVERSERS HAD THEIR CIRCUIT BREAKER PULLED. IT WAS PART OF THE MECH'S PROC. WITH THE OUTSIDE WORK COMPLETE; THE FLC NEVER RECHKED ANY SWITCH OR CIRCUIT BREAKER SETTINGS. CAPT SAID THE CIRCUIT BREAKERS ARE VISIBLE FROM HIS SEAT LOCATION; BUT HE NEVER RECHKED ANY CIRCUIT BREAKERS NOR DID HE FEEL THEM WITH HIS HANDS. HE COULD HAVE RESET THEM INFLT WITHOUT LEAVING HIS SEAT. HOWEVER; HE HAD NO REASON TO BELIEVE THE CIRCUIT BREAKERS HAD BEEN PULLED. BECAUSE HIS COMPANY DOES NOT STAFF MECHS AT PVD; THEY CALL UPON CONTRACT MAINT TO FILL THE NEED WHEN MECHANICAL PROBS ARISE. CONTRACTED MECHS DO NOT NORMALLY HAVE THE EXPERI ENCE COMPANY MECHS HAVE; SO THEIR WORK AND PROCS ARE NOT AT A LEVEL COMPARABLE WITH COMPANY STANDARDS. RPTR FEELS LET DOWN BY THE MECH THAT WORKED ON HIS ACFT. HE WOULD HOPE THE MECH WOULD LET THE PLTS BE INFORMED OF ALL SWITCH MOVEMENTS HE MADE DURING THE REPAIR OF HIS ACFT. THE FO MADE THE LNDG ON RWY 9L AT ORD. IT WAS SNOWY AND ICY ON THE RWY. NORMAL USE OF THRUST IS TO JUST GO TO IDLE REVERSE. WHEN HIS FO WENT TO IDLE REVERSE AND NOTHING HAPPENED; HE IMMEDIATELY TOOK CTL OF THE ACFT AND BEGAN APPLYING BRAKING. THE ACFT WENT RIGHT TO THE END OF THE RWY.