Operating Gear Assembly

Regardless of the JBD installation, the operation is the same. A pair of JBD panels is connected to a set of operating gear. The panel assemblies can be raised independently or simultaneously with others in the same installation. By connecting a pair of panels to a set of operating gear, one cylinder can raise or lower a pair of JBD panels in the event of a failure to the other cylinder. Operating Gear Assembly The operating gear assembly (fig. 5-3) provides the means of physically raising and lowering the JBD panels. A set of operating gear consists of two hydraulic cylinders, three bearing blocks, one trunnion shaft, two crank assemblies and four linkage assemblies. Each linkage assembly consists of an arm, strut and eye. The linkage for two JBD panels is connected to a single shaft. This method of attachment permits raising and lowering the JBD panels in pairs. The trunnion shaft is mounted and supported by the three bearing block assemblies. The two hydraulic cylinders are connected to the to the trunnion shaft by means of the crank assemblies. Movement of the hydraulic cylinder piston rods rotates the shaft. Rotation of the trunnion shaft extends or retracts the linkage to raise or lower the JBD panels. Magnets, attached to the linkage arm and eye assemblies, actuate limit switches mounted to brackets on the side of the operating gear deck cutouts to indicate position of the panel assemblies. Removable panel supports can be attached to the operating gear and flight deck to lock panels in the raised position for maintenance, or if access to the area beneath the panels is required. 5-3 LUBRICATION LINE AND FITTING LINKAGE (ARM, STRUT, AND EYE HYDRAULIC CYLINDER EMERGENCY PANEL SUPPORT FLIGHT DECK (REF) HYDRAULIC CYLINDER SHAFT CRANK BEARING BLOCK LUBRICATION FITTINGS ABEf0503 LUBRICATION FITTING Figure 5-3.—Operating gear assembly.