An aircraft control surface disconnect detection system, the system comprising: a mechanical disconnect detection device that includes: a first portion comprising first and second arms (306, 308) that can move relative to one another; a first contact element; a second contact element; a mechanical fuse that includes the first and second contact elements (322, 324) on either end of a conduction path, wherein the mechanical fuse joins together the first and second arms (306, 308); and a radio frequency, RFID tag; wherein the RFID tag includes an antenna having first and second antenna portions (404a, 404b), the first antenna portion being electrically connected to the first contact element and the second antenna portion being electrically connected to the second contact element; wherein in a normal operational state the conduction path shorts the first and second portions of the antenna and when in an aircraft control surface disconnected state the conduction path does not short the first and second portions of the antenna; and wherein when the mechanical disconnect detection device is in the normal operation state the RFID tag is not able to transmit information, and when the mechanical disconnect detection device is in the control surface disconnected state the RFID tag is able to transmit information; wherein, in use, the first portion of the mechanical disconnect detection device is fixedly connected to a first aircraft flight control surface and the mechanical disconnect detection device further includes a second portion configured to be fixedly connected, in use, to a separate second aircraft flight control surface and disposed between the first and second arms (306, 308), such that relative motion between the first and second aircraft flight control surfaces causes one of the first and second arms to contact the second portion and causes the mechanical disconnect detection device to switch from the normal operational state to the control surface disconnected state by breaking the mechanical fuse. a first portion comprising first and second arms (306, 308) that can move relative to one another; a first contact element; a second contact element; a mechanical fuse that includes the first and second contact elements (322, 324) on either end of a conduction path, wherein the mechanical fuse joins together the first and second arms (306, 308); and a radio frequency, RFID tag; wherein the RFID tag includes an antenna having first and second antenna portions (404a, 404b), the first antenna portion being electrically connected to the first contact element and the second antenna portion being electrically connected to the second contact element; wherein in a normal operational state the conduction path shorts the first and second portions of the antenna and when in an aircraft control surface disconnected state the conduction path does not short the first and second portions of the antenna; and wherein when the mechanical disconnect detection device is in the normal operation state the RFID tag is not able to transmit information, and when the mechanical disconnect detection device is in the control surface disconnected state the RFID tag is able to transmit information; wherein, in use, the first portion of the mechanical disconnect detection device is fixedly connected to a first aircraft flight control surface and the mechanical disconnect detection device further includes a second portion configured to be fixedly connected, in use, to a separate second aircraft flight control surface and disposed between the first and second arms (306, 308), such that relative motion between the first and second aircraft flight control surfaces causes one of the first and second arms to contact the second portion and causes the mechanical disconnect detection device to switch from the normal operational state to the control surface disconnected state by breaking the mechanical fuse.