| CPC B64C 3/56 (2013.01) | 8 Claims |

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1. A locking pin system comprising:
an actuator having an actuator body defining an axial bore along its length;
a locking pin axially moveably mounted within the bore; and
drive means for driving the locking pin axially along the bore between a locking position extending from the actuator body and an unlocking position relatively retracted into the actuator body, the drive means comprising:
engagement means for releasably engaging the locking pin, the engagement means being biased to an open position where they are not in engagement with the locking pin;
wherein the bore comprises a first section having a first diameter and a second section having a second, wider diameter; and
wherein the bore and the engagement means are configured such that when the engagement means are located in the first section, the actuator body forces the engagement means to a closed position to engage with the locking pin and when the engagement means are in the second section, they return to the open position and out of engagement with the locking pin.
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