A B777-200 WAS DISPATCHED IN NON COMPLIANCE WITH THE L ENG FAN REVERSER LOCKED OUT. CAUSED BY FAILURE TO REMOVE LOCK PIN AFTER MAINT.

Narrative

2 TECHNICIANS ON MY SHIFT TOOK OVER A FAN AIR MODULATION VALVE INSTALLATION AT START OF SHIFT. THERE WAS NO TIME FOR OPS CHK; SO DECISION WAS MADE TO DEFER AND LOCK VALVE IN THE OPEN POS PER MEL. ALSO; REVERSER WAS DEACTIVATED BY PINNING THE PYLON ISOLATION VALVE. AFTER DEACTIVATION; TECHNICIANS FORGOT REVERSER PIN REMOVAL AND LEFT REVERSER DEACTIVATED. WRITE-UP WAS SIGNED OFF BY ME AND ACFT RELEASED AFTER CONFERRING WITH TECHNICIANS THAT JOB WAS DONE AND ACFT READY. AFTER ACFT GOT TO SFO; CREW RPTED L REVERSER DID NOT WORK ON LNDG. PIN WAS DISCOVERED INSTALLED AND ACCESS DOOR HINGES DAMAGED. ACFT TOOK A 30 MIN DELAY IN SFO AND DISCREPANCY WAS RPTED. HUMAN PERFORMANCE: AS A LEAD; I SIGNED OFF ON DEFERRAL AND RELEASED PLANE TO HELP MECHS GET PLANE OUT SOONER. I WAS TAUGHT BY ACR THAT THIS WAS LEGAL AS LONG AS I CONFERRED WITH MECHS PERFORMING WORK AND ALSO CHARGING THEIR WORK HRS ON SIGNOFF. 2 TECHNICIANS THAT PERFORMED WORK ASSURED ME THAT THE MEL WAS FULLY COMPLIED WITH AND ACFT WAS READY FOR DISPATCH. I CALLED DISPATCH AND GOT APPROVAL FOR VALVE DEFERRAL AND ALSO RELEASED ACFT FOR FLT. I AM BEING IMPLICATED FOR THIS INCIDENT BECAUSE OF MY SIGNOFF.