A EMB-145 REQUIRED AIR TURNBACK AFTER TWO EACH OUTFLOW VALVES WOULD NOT OPERATE AFTER MAINT WORK.

Narrative

MR X AND MYSELF WERE SENT TO WORK ON ACFT FOR MEL; SVC DOOR SEAL LEAKING. I REMOVED THE HOLD OPEN BLOCKS ON THE 2 OUTFLOW VALVES AND INSTALLED THEM TEMPORALLY ON THE HOLDS FOR THEM. WE PRESSURIZED ACFT TO 2 PSI. MR X NOTED SEVERAL LEAKS AROUND BOTTOM OF DOOR. TOOK ACFT BACK DOWN TO ZERO PSI. WE NOTICED A COUPLE OF RAISED AREAS AT BOTTOM WHERE SEAL SHOULD BE SMOOTH. REPAIRED SEAL AND PRESSURIZED ACFT AGAIN. NO LEAKS OR SQUEALS WERE NOTED. LOGBOOK WAS COMPLETED AND MEL RESTORED. DURING THIS TIME I TOLD MR X TO GO BACK AND INSTALL THE HOLD OPEN BLOCKS PERMANENTLY IN THE HOLDS. MR X TOLD ME IT WAS DONE. THE NEXT DAY I WAS NOTIFIED THAT THE ACFT DID AN AIR TURN-BACK. AFTER TALKING TO MR X ON FRIDAY HE STATED HE INSTALLED THE HOLD OPEN BLOCKS ON THE VALVES AND NOT THE HOLDS WHERE THEY BELONG. I FEEL THAT THERE WAS A BREAKDOWN BTWN WHAT I STATED AND WHAT HAPPENED. I SHOULD HAVE DOUBLE-CHKED SINCE MR X HAS NOT HAD A LOT OF EXPERIENCE. WHEN ACFT CAME BACK IT WAS NOTED THAT THE BLOCKS WERE IN THE VALVES AND NOT IN THE HOLDS.