ACFT MAINT DISCREPANCY CREATED WHEN MECH FAILS TO RE- CONNECT THE DISCONNECTED HYD FLUID SUPPLY LINE TO THE MAIN RESERVOIR TANK.

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WHILE REPAIRING A HYD LEAK ON ONE OF MY COMPANY'S ACFT I REMOVED A HYD SUPPLY HOSE FROM THE RESERVOIR TO PREVENT EXCESSIVE LOSS OF HYD FLUID. THE REPAIR TO THE LEAK WENT WELL; THE PAPERWORK WAS COMPLETED AND THE ACFT WAS DISPATCHED FOR ITS DEST WITH A MINIMAL DELAY. LATER THAT MORNING WHILE REVIEWING THE PLANNED WORK FOR THAT ACFT; I NOTICED THE FLC HAD WRITTEN UP A LOW HYD PRESSURE WARNING PROB. THE FBO MECH WHERE THE ACFT LANDED FOUND THE HYD SUPPLY HOSE DISCONNECTED AT THE RESERVOIR. THE LINE MAINT CTLR FOR OUR COMPANY DEFERRED THE HYD PUMP PER THE MEL AS INOP DUE TO THE EXTENDED LENGTH OF TIME THE PUMP HAD BEEN RUN WITH NO FLUID SUPPLY. I REALIZED IMMEDIATELY THAT I HAD FORGOTTEN TO RECONNECT THE SUPPLY HOSE; A VERY SINKING FEELING. I FEEL THAT THE TIME RESTRAINTS AS WELL AS THE CONSTANT NEED TO 'GET THE PLANE OUT ON TIME' ENVIRONMENT; THAT IS A SIT THAT WE DEAL WITH EVERY DAY; HAD FINALLY CAUGHT UP TO ME. THE HOSE THAT I FORGOT TO RECONNECT CAN EASILY BE FORGOTTEN AS IT IS BARRED BEHIND A COUPLE OTHER HOSES. I DO BELIEVE IF I SIMPLY TOOK THE TIME TO ATTACH A STREAMER TO THE END OF THE HOSE AND HAD THAT STREAMER HANGING OUT WHERE ANYONE COULD SEE IT; THIS MAY HAVE HELPED PREVENT THIS INCIDENT. SINCE I HAVE WORKED IN ACFT MAINT FOR ALMOST 30 YRS WITHOUT EVER HAVING SUCH A SIT HAPPEN BEFORE; I REALIZE IT IS UP TO EVERY ONE OF US INVOLVED IN ACFT MAINT TO CHK; RECHK AND CHK AGAIN ONCE OUR JOB IS 'COMPLETE.'