A system for monitoring an aircraft structure, the system comprising: an optical fiber network adapted to extend along the aircraft structure; an optical emitter optically coupled to the optical fiber network and configured to generate an optical signal and to transmit the generated optical signal to the optical fiber network; a series of optical acoustic transducers (S 1 - S N) optically coupled to the optical fiber network and adapted to mechanically couple to the aircraft structure at a series of acoustic sensor locations, each of the series of optical acoustic transducers (S 1 - S N) configured to receive the generated optical signal, to generate an optical response signal indicative of a detected acoustic condition at a respective acoustic sensor location, and to transmit the generated optical response signal to the optical fiber network; an optical detector optically coupled to the optical fiber network and configured to receive the transmitted optical response signals generated by the series of optical acoustic transducers (S 1 - S N); a controller configured to generate a trigger signal, if a triggering one of the received optical response signals is indicative of a triggering acoustic event, the controller further configured to determine, based on a relative timing of the triggering one of the received optical response signals, a specific one of the acoustic sensor locations associated with a specific one of the series of optical acoustic transducers (S 1 - S N) that generated the triggering one of the optical response signals associated with the generated trigger signal; and an acoustic transducer configured to actively generate an acoustic signal; characterised in that the system is further configured to perform, in response to receiving the trigger signal, a health scan of the aircraft structure at the specific one of the series of acoustic sensor locations, wherein the health scan includes controlling the acoustic transducer to generate the acoustic signal and monitoring acoustic responses to the generated acoustic signal. an optical fiber network adapted to extend along the aircraft structure; an optical emitter optically coupled to the optical fiber network and configured to generate an optical signal and to transmit the generated optical signal to the optical fiber network; a series of optical acoustic transducers (S 1 - S N) optically coupled to the optical fiber network and adapted to mechanically couple to the aircraft structure at a series of acoustic sensor locations, each of the series of optical acoustic transducers (S 1 - S N) configured to receive the generated optical signal, to generate an optical response signal indicative of a detected acoustic condition at a respective acoustic sensor location, and to transmit the generated optical response signal to the optical fiber network; an optical detector optically coupled to the optical fiber network and configured to receive the transmitted optical response signals generated by the series of optical acoustic transducers (S 1 - S N); a controller configured to generate a trigger signal, if a triggering one of the received optical response signals is indicative of a triggering acoustic event, the controller further configured to determine, based on a relative timing of the triggering one of the received optical response signals, a specific one of the acoustic sensor locations associated with a specific one of the series of optical acoustic transducers (S 1 - S N) that generated the triggering one of the optical response signals associated with the generated trigger signal; and an acoustic transducer configured to actively generate an acoustic signal; characterised in that the system is further configured to perform, in response to receiving the trigger signal, a health scan of the aircraft structure at the specific one of the series of acoustic sensor locations, wherein the health scan includes controlling the acoustic transducer to generate the acoustic signal and monitoring acoustic responses to the generated acoustic signal.