A transport lock assembly for a medicament delivery device, wherein the transport lock assembly comprises a powerpack (30) having a locking member (50, 50′；, 50″；) configured to interact with a control member (60), which locking member (50, 50′；, 50″；) is movable, relative to the control member (60), from a first state in which the control member (60) is immobilized, to a second state in which the control member (60) is free to move； wherein the transport lock assembly further comprises a housing part (20) having a key member (22), such that assembly of the powerpack (30) with the housing part (20) causes the key member (22) to move the locking member (50, 50′；, 50″；) from the first state to the second state.
