25 October 2004
Figure 4-7. MK-48 afterbody teardown hood.
MK-48 Workbench Hood
. After defueling and decoupling, personnel
dismantle and inspect the fuel tank and the engine section. They then load components
of the fuel tank and the engine section into the parts washer. Design a backdraft
exhaust hood as illustrated in Figure 4-8 to control contaminants generated by these
workbench operations. Specify the following criteria for workbench hoods:
a. A 1850- x 600-mm (72- by 24-in) stainless steel workbench top to
support the whole exhaust hood. See Figure 4-8 for dimensions of the
b. A 76-mm (3-in) airfoil rotated inward to prevent turbulence and
c. Lighting that is vented and flush mounted in the top of the exhaust
MK-48 Parts Washer Hood. Design or modify the parts washers as
shown on Figure 4-9. Specify the following criteria for the parts washers:
Fabricate a new enclosure to mount on top of the parts washer.
b. Relocate the cover with a pneumatic plunger and a fusible link