AN ACR B727-200 FLC WAS UNABLE TO RETRACT THE LNDG GEAR AFTER TKOF. AFTER RETURNING; MECH DISCOVERED THAT AN ACTUATOR ARM HAD BEEN IMPROPERLY REATTACHED. THE ARM WAS THEN PROPERLY INSTALLED AND THE GEAR OPERATED NORMALLY. NO DAMAGE.

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ON A B727-200; WE WERE REPLACING A SHEARED BOLT ON A LOWER WING PANEL AND THE SHIFT BEFORE HAD DISCONNECTED THE GEAR DOOR ACTUATOR ARM AND TIED IT BACK. THEN THEY PINNED THE NOSE AND L HAND MAIN GEAR AND RETRACTED THE R HAND MAIN FOR ACCESS TO THE BOLT. AFTER THE BOLT WAS REPLACED WE EXTENDED THE GEAR AND REINSTALLED THE ACTUATOR ARM. ON TKOF THE GEAR WOULD NOT RETRACT. IT WAS FOUND THAT THE ARM WAS INSTALLED UPSIDE DOWN. A BETTER TURNOVER AND MORE SLEEP MAY HAVE PREVENTED THIS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THAT THE ACTUATOR ARM GOES BTWN THE MAIN STRUT AND THE DRAG LINK. HOWEVER; DURING THE RUSH TO FINISH THE JOB; THIS TEAM INSTALLED THE ARM SO THAT IT PASSED BEHIND THE DRAG LINK INSTEAD OF IN FRONT. AS THE GEAR ATTEMPTED TO RETRACT THE DRAG LINK STRUCK THE ACTUATOR ARM AND STOPPED; PREVENTING FURTHER MOVEMENT. THERE WAS NO DAMAGE. ONCE THE ARM WAS PROPERLY ROUTED THE GEAR FUNCTIONED NORMALLY. THE MAINT TEAM FELT THAT ERRORS ARE MORE COMMON DURING THE NIGHT SHIFT DUE TO FATIGUE.