s in the closed position it can be seen that the lower edge 16 a of the door 12 extends below door opening o and also below the floor level sl fig2 a 3 and 5 a of the scr floor sf the lower edge 16 a of the door 12 is positioned within a well or recess generally r in the platform or landing generally p extending outwardly adjacent the scr floor sf such platform p having a floor pf typically being at generally the same floor level pl as is the floor level sl of the scr floor sf recess r which extends at least the full width of door 12 is provided in platform p and is defined in part by the scr system exterior wall w to open the door to an open position such as shown in fig2 b and 4 suspension rod nut 74 is first tightened to place suspension rod 58 in tension nuts 84 on swing bolts 18 are then loosened suspension rod nut 74 would then be further tightened on suspension rod 58 which because of the engagement of suspension rod nut 74 with the base 86 of yoke 72 would cause a corresponding lifting of door 12 this would raise door 12 upwardly from the position shown in fig5 b once the door is raised.