The inspection line pan has an opening (11), in its deck plate (10) and a three-piece door (12) located in the opening. The door is formed of three rectangular panels (15, 16, 17) of similar length and width which are disposed transversely of each other. The outer panels (15, 17) are pivotally connected to the centre panel (16) and the centre panel has transverse grooves (18) which are supported on tongues on central portions of the opening (10) for transverse movement. In use, one or other outer panel can be pivotally raised for inspection below the line pan. If access to the area below the line pan is required, the centre panel can be slid transversely into the space created by the raised outer panel and after the centre panel is free of the tongues, it can be lifted clear of the opening. If the outer panels are attached to the centre panel, they are lifted clear of the opening with the centre panel; otherwise they are removed separately.