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 TB 740-97-4
APPENDIX B
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
LANDING CRAFT, MECHANIZED, DIESEL, STEEL,
56 FT., MARK VI, DESIGN LCM-6
1.
General. This appendix provides detailed instructions for preparation of the mechanized landing craft, design
LCM-6, for dynamic dehumidification.
2.
Preparation Instructions. a. Disassembly and Stowage.
(1) Lazaret. The following items will be removed, identified, and stowed in the Lazaret:
(a) Wing compartment access covers.
(b) Four vent cowls.
(c) Emergency tiller and access plate.
(d) Bottom drain plugs.
(e) Ramp drain plugs.
(2) Engine room. The following items will be removed, identified, and stowed in the engine room:
(a) Electric horn.
(b) Mushroom cover.
(c) Mast.
(d) Navigation lights.
(e) Bell.
(f) Anchor.
(3) Air heater assembly. The cover will be removed from the air heater. The electrode assembly will be
removed, cleaned of carbon and secured with the cover adjacent to the place of removal.
(4) Ramp. The 50-inch lengths of 5/8-inch plow steel cable and two 5/8-inch wire rope clips for each cable will
be applied to support ramp in partially open position.
b. Preparation for Dynamic Dehumidification.
(1) Dehumidified area. The engine room and cab of each landing craft will be prepared for dehumidification.
Normally a dynamic dehumidification system will be installed for each group of four vessels as shown on figure 5 or 6.
(2) Provision for ventilation and air circulation.
(a) Ramp drain openings. Ramp drain openings will be covered with standard aluminum insect screen.
(b) Bottom drain openings. Bottom drain openings will be covered with standard aluminum insect
screen.
(c) Lazaret. A galvanized gooseneck-type or turbine-type ventilator will be installed in the Lazaret
openings. The opening in the ventilator will be covered with standard aluminum insect screen.
(d) Void spaces. Void spaces in the side wing compartments will be provided with vents to allow
circulation of air. Minimum 3-inch diameter, galvanized gooseneck-type or turbine-type ventilators will be secured in the
access port openings. Openings In the ventilators will be covered with standard aluminum insect screen.
(3) Sealing for dehumidification. Methods and materials used in sealing for dehumidification will be in
accordance with this bulletin. Detailed sealing requirements are outlined below.
(a) Cab.
1. Roof. A roof will be fabricated of No. 20 gage galvanized sheet metal and 1/8 x 1-inch angle
irons In accordance with figure 8. The length of the angle irons will equal the outside longitudinal dimensions of the cab.
The vertical faces will be cut back the thickness of the bulkhead, in order that the installed roof will be supported by the
horizontal faces of the angle irons bearing on the fore and aft bulkheads. The sheet metal will be formed to provide a lip
of approximately 2 inches all around. All seams will be sealed on the inside with bituminous coating. The installed roof
will be sealed to the cab with 4-inch wide pressure sensitive tape applied all around the lip. The roof, tape, and adjacent
surfaces will be coated with strippable coating and bituminous coating.
2. Cab door. The door will be secured in closed position. The door edges and door handle will be
sealed with strippable coating and bituminous coating.
3. Cab drains and peepholes. Drains and peepholes will be masked with pressure-sensitive tape
and covered with strippable coating and bituminous coating, except that one of the peep-
Change 2
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