TM 10-5411-232-13&P CARGO BED COVER (CBC) M105A2 TRAILER,  TYPE II 0005 00 CONTROLS AND INDICATORS Table 0005 00-1.  CBC Controls KEY CONTROL FUNCTION 1 Upper Door Assembly Latch Handle opens and closes upper door 2 Lower Door Assembly Latch Handle opens and closes lower door 3 2-Way Ventilator Grip bar opens and closes 2-way ventilator 4 Folding Step Extends to provide a step, retracts when not in use 5 Access Plate When unscrewed, provides opening to insert electrical or signal cables into the CBC 0005 00-2