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.
