sleeve 60 therefore begins to differ from the rotational speed of housing 70 this quickly allows longitudinal channels 72 in housing 70 to become aligned with slots 62 in sleeve 60 when this happens rollers 82 can move radially inwardly into channels 72 thereby freeing output sleeve 80 from its rotational coupling to sleeve 60 this allows sleeve 80 to rotate freely and places the actuator in its fail free mode the load normally moved at least in part by actuator 10 is thereby freed from the failed actuator e g so that it can continue to be moved by other actuators that have not failed once rollers 82 have moved into channels 72 they are preferably retained there by any suitable means such as the depicted magnet 74 which has axially extending alternating north and south poles 76n and 76s spaced from one another circumferentially around the magnet this prevents the actuator from engaging again after it has disengaged and freed its load in lieu of magnet 74 rollers 82 could alternatively be captured by any of many other types of structures such as spring clips or other detent elements from the foregoing it will be seen that the fail free actuator structure of this invention allows both drive.