A system (100; 200; 300; 500) comprising a foldable wingtip for an aircraft; first and second latch pin assemblies, each latch pin assembly having a latch pin actuatable between a first position engaged with the foldable wingtip and a second position not engaged with the foldable wingtip, and a lock (520A-D) that is actuatable between an open position in which the latch pin is allowed to move from its first position to its second position, and a closed position in which the latch pin is prevented from moving from its first position to its second position; and an actuator (102; 202; 302; 502) configured to provide a rotational input (112A; 212A; 312A; 512A); characterized in that the system (100; 200; 300; 500) further comprises: a first summing mechanism (106; 206A; 330; 506A) which, when in use, divides the rotational input (112A; 212A; 312A; 512A) proportionally between a first output (114A; 214A; 314A; 514A), and a second output (116A; 216A; 314C; 516A), based on a first load and a second load applied respectively to the first output (114A; 214A; 314A; 514A) and to the second output (116A; 216A; 314C; 516A), an input of the first summing mechanism (106; 206A; 330; 506A) being rotatably driven by the rotational input (112A; 212A; 312A; 512A) provided by the actuator (102; 202; 302; 502) and the second output (116A; 216A; 314C; 516A) of the first summing mechanism (106; 206A; 330; 506A) being rotatably coupled to a lock of the first latch pin assembly; an end mechanism (108; 208; 308A, 308B; 506D) with an input (114B; 214F; 314F; 514F) and a first output (116B; 216D; 316A; 516D), the input (114B; 214F; 314F; 514F) of the end mechanism (108; 208; 308A, 308B; 506D) being in use rotatably driven by the first output (114A; 214A; 314A; 514A) of the first summing mechanism (106; 206A; 330; 506A) and the first output (116B; 216D; 316A; 516D) of the end mechanism (108; 208; 308A, 308B; 506D) being rotatably coupled to a lock of the second latch pin assembly; a sensor (104; 204; 304; 504) which, when in use, senses a position of the actuator (102; 202; 302; 502) which provides the rotational input; and a controller (110; 210; 310; 510) which, when in use, determines a status of the locks of the first and second latch pin assemblies based on a sensed position of the rotational input (112A; 212A; 312A; 512A) provided by the actuator (102; 202; 302; 502). a first summing mechanism (106; 206A; 330; 506A) which, when in use, divides the rotational input (112A; 212A; 312A; 512A) proportionally between a first output (114A; 214A; 314A; 514A), and a second output (116A; 216A; 314C; 516A), based on a first load and a second load applied respectively to the first output (114A; 214A; 314A; 514A) and to the second output (116A; 216A; 314C; 516A), an input of the first summing mechanism (106; 206A; 330; 506A) being rotatably driven by the rotational input (112A; 212A; 312A; 512A) provided by the actuator (102; 202; 302; 502) and the second output (116A; 216A; 314C; 516A) of the first summing mechanism (106; 206A; 330; 506A) being rotatably coupled to a lock of the first latch pin assembly; an end mechanism (108; 208; 308A, 308B; 506D) with an input (114B; 214F; 314F; 514F) and a first output (116B; 216D; 316A; 516D), the input (114B; 214F; 314F; 514F) of the end mechanism (108; 208; 308A, 308B; 506D) being in use rotatably driven by the first output (114A; 214A; 314A; 514A) of the first summing mechanism (106; 206A; 330; 506A) and the first output (116B; 216D; 316A; 516D) of the end mechanism (108; 208; 308A, 308B; 506D) being rotatably coupled to a lock of the second latch pin assembly; a sensor (104; 204; 304; 504) which, when in use, senses a position of the actuator (102; 202; 302; 502) which provides the rotational input; and a controller (110; 210; 310; 510) which, when in use, determines a status of the locks of the first and second latch pin assemblies based on a sensed position of the rotational input (112A; 212A; 312A; 512A) provided by the actuator (102; 202; 302; 502).