Apparatus and method for observing combustion conditions in a gas turbine engine

A fuel injector for a gas turbine combustor is disclosed which includes a feed arm (22) having a flange (24) for mounting the injector within the combustor and a fuel nozzle (26) depending from the feed arm for injecting fuel into the combustor for combustion. An optical sensor array (34) is located within the fuel nozzle for observing combustion conditions within the combustor.