A DEHAVILLAND DHC-8-202 ACFT EXPERIENCED IN-FLIGHT INCIDENT OF OIL LOSS AFTER STARTER/GENERATOR CHANGE.

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THERE WERE A TOTAL OF 2 MECHS ON DUTY; WITH 2 ACFT TO WORK ON. ACFT X HAD 6 PRODUCTION WORK ITEMS AND 2 MAINT GENERATED WRITE-UPS ON IT. AFTER WE COMPLETED THE LINE CHK; MYSELF AND THE OTHER MECH ON DUTY STARTED TO WORK ON SEPARATE ITEMS. I HAD A WRITE-UP FOR A NOSE TIRE; WHICH I CHANGED. WHILE THE OTHER MECH WORKED ON REPLACEMENT OF THE ENG FIRE BOTTLE; I THEN STARTED IN ON THE REMAINING PRODUCTION ITEMS. I STARTED ON THE STARTER GENERATOR. I COMPLIED WITH THE TASK CARD; I FOLLOWED ALL THE REQUIRED TORQUES; VISUALLY INSPECTED THE CLAMP AND ASSOCIATED HOOKUPS TO THE GENERATOR. THE CLAMP WAS ON AND TORQUED. I GENTLY MOVED THE GENERATOR TO CHK IT WAS ON TIGHT AND THE GENERATOR DID NOT MOVE. I THEN CONTINUED WITH THE R/R OF THE PROP RELAYS. AFTER THAT; ALL OF THE PRODUCTION AND MAINT ITEMS WERE DONE WITH THE EXCEPTION OF THE STARTER/GENERATOR AND DEICE OPS CHKS. I BELIEVE THAT IT WAS APPROX 2.5 HRS LATER. WE TOOK A SHORT BREAK AND RETURNED TO THE ACFT FOR THE REMAINING OPS CHKS. I AM WORKING ON GETTING MY RUN/TAXI FOR THE -200 AND I WAS IN THE L SEAT WITH THE OTHER MECH IN THE R SEAT. HE IS QUALIFIED RUN/TAXI. AFTER COMPLETING THE CHKLIST AND STARTING THE ACFT; WE COMPLIED WITH THE OPS CHK OF THE GENERATOR. IT PASSED THE OPS CHK. WE THEN COMPLIED WITH THE OPS CHK OF THE PROP DEICE SYS. IN THAT OPS CHK YOU BRING THE PROPS UP TO 900 RPM. THE SYS OPS CHK PASSED. THE TOTAL DURATION OF THE ENG RUN WAS ABOUT 10 MINS. I THEN WENT TO LEAK CHK THE GENERATOR; THERE WAS NO OIL LEAKING. I VISUAL CHKED THE GENERATOR AND NOTED NO DEFECTS IN THE INSTALLATION. I AGAIN GENTLY SHOOK THE GENERATOR; IT WAS ATTACHED TO THE ENG. WE THEN WENT BACK TO THE SHOP AND FINISHED THE PAPERWORK. AFTER IT WAS COMPLETE; WE WENT AND WORKED ON THE OTHER ACFT THAT WAS HERE THAT NIGHT. LATER; WE GOT A CALL FROM MAINT CTL ABOUT AN ACFT IN ZZZ1 THAT NEEDED MAINT. WE LOADED THE PARTS THAT WERE NEEDED AND STARTED TO DRIVE THERE. I WAS INFORMED WHILE ENRTE TO ZZZ1 ABOUT WHAT HAD HAPPENED. THE FOLLOWING ARE SOME HUMAN FACTORS: THE WORKLOAD FOR THAT ACFT WAS HVY FOR THE AMOUNT OF MECHS ON HAND. FATIGUE MAY HAVE PLAYED A ROLE; I HAD BEEN WORKING NON STOP FOR APPROX 4 1/2 HRS. I HAVE BEEN UNDER SOME STRESS LATELY WITH THE LOSS OF MY CLOSE RELATIVE.