AN AIRBUS 320 WAS DISPATCHED IN NON COMPLIANCE WITH #2 ENG THRUST REVERSER LOCKOUT PIN INSTALLED. UNABLE TO REVERSE #2 ENG ON LNDG.

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SHIFT REPLACED THE IDG ON THE #2 ENG OF ACFT. THEY LEFT THE LEAK AND OPERATIONAL CHK FOR DAY SHIFT. ACFT TRIP WAS NOT UNTIL XA00. AS THE LEAD I HAD A CREW OF 6 A&P'S AND 2 R&E'S. FOR OUR CREW WE WERE WORKING 3 OTHER ACFT SO AT THE TIME OF THE LEAK CHK I ASSIGNED 2 CREW MEMBERS TO PERFORM THE CHK WITH ME HELPING. AFTER LEAK CHK AND SVCING IDG; COWLS WERE CLOSED AND ACFT TAXI FROM HANGAR TO TERMINAL FOR DEP; WHEREUPON LNDG #2 ENG REVERSER DID NOT DEPLOY; DUE TO THE REVERSER LOCKOUT PIN NOT BEING REMOVED. NO INDICATION WAS VISIBLE WHEN CLOSING COWLS THAT REVERSER WAS LOCKED CLOSED. WHILE I TOOK CARE OF THE PAPERWORK THE REST OF THE CREW MOVED OVER TO WORK ANOTHER ACFT. WHILE SIGNING OFF PAPERWORK WHEN I SIGNED OFF THE CARD FOR REVERSERS; I JUST ASSUMED THAT THE PIN HAD BEEN REMOVED BECAUSE THE FLAG WAS NOT VISIBLE AND THE REVERSER COWLS WERE NOT OPEN ON OUR SHIFT JUST THE FAN COWLS FOR THE OPERATIONAL CHK. THE LOCKOUT PINS HAVE 6 FT OF FLAG MATERIAL. IF IT WAS HANGING DOWN; IT WOULD HAVE BEEN VERY VISIBLE. EITHER WEIGHTED FLAGS OR ANOTHER TYPE OF INDICATION SHOULD BE USED. IT WAS OBVIOUS. THE FLAG WAS NOT OBVIOUS WHETHER THE WIND BLEW IT UP OUT OF THE WAY OR IF SOMEONE PLACED IT OUT OF VIEW WHILE WORKING IN THE AREA. I WAS HELPING AND STANDING RIGHT IN VIEW OF WHERE THE FLAG SHOULD HAVE BEEN AND I DID NOT SEE IT. I WOULD NOT CLOSE THE COWLS IF IT WOULD HAVE BEEN VISIBLE.