Abstract: An apparatus is provided for carrying a mobile inspection assembly in the interior of a tubular body, the assembly of inspection being adapted to emit and receive at least one sweeping radiation beam for inspection purposes. The apparatus includes a pair of carrier assemblies, coupled together by a bridge which has at least two linking pieces and a coupling piece therebetween. The apparatus also has a reflector with at least as many reflection planes as the bridge has linking pieces, each of which reflection planes defines a transmission path. The reflector is rotatable about a longitudinal axis through the carrier assemblies, the reflection planes being so arranged that at least one transmission path extends to the interior of the tubular body at any one time. Part of each transmission path is longitudinal and part is perpendicular to the longitudinal axis. The reflection planes are arranged so as to partially overlap.