A B757 WITH #2 ENG MISSING 4 FAN STATOR VANES WAS GIVEN AN ENGINEERING ORDER FOR A ONE-TIME NON REVENUE FLT TO A MAINT FACILITY. FLT WAS RESCHEDULED TO FLY 2 REVENUE FLTS; BOTH ALLOWED PER 2 SEPARATE ONE-TIME ENGINEERING ORDERS.

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B757 NUMBER X WAS PREVIOUSLY GNDED FOR 4 FAN STATOR BLADES MISSING ON #2 ENG. AFTER 12 HRS; AN ENGINEERING ORDER WAS ISSUED FOR A ONE-TIME FLT. WE WERE ASSIGNED THE FLT AND WERE TO FLY THE EMPTY ACFT TO ZZZ2. THIS WAS NOT A FERRY FLT. DURING THIS TIME; A B727 FLYING ZZZ1-ZZZ-ZZZ1 EXPERIENCED A MECHANICAL PROB AND RETURNED TO THE GATE. ACR DECIDED TO RESCHEDULE US TO FLY THE REVENUE FROM THE B727 TO ITS DEST ZZZ. I REMINDED SCHEDULING THAT THE ENGINEERING ORDER WAS FOR A ONE-TIME FLT AND THAT THE BEST ENG REPAIR FACILITY WAS ZZZ2 NOT ZZZ. NEVERTHELESS; WE WERE ISSUED A NEW FLT RELEASE AND WE PROCEEDED TO ZZZ. WE EXPECTED THAT THE ACFT WOULD REMAIN THERE FOR REPAIR BUT WERE INFORMED THAT YET ANOTHER 'ONE-TIME' FLT WAS IN THE WORKS AND WE WOULD FLY MORE REVENUE TO ZZZ2. SEVERAL HRS LATER; A NEW ENGINEERING ORDER WAS ISSUED AND WE WERE RESCHEDULED TO FLY TO ZZZ2. I UNDERSTAND THE NEED FOR THE ENGINEERING ORDER TO ALLOW THE ACFT TO BE MOVED TO A REPAIR FACILITY; BUT MULTIPLE ENGINEERING ORDERS FOR THE APPARENT PURPOSE OF CONTINUING NORMAL COMMERCE SEEMS TO BE AN ABUSE OF THE SYS. THIS SHOULD NOT HAPPEN AGAIN.