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 TB 740-97-4
APPENDIX C
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
LANDING CRAFT, MECHANIZED, DIESEL,
STEEL, 69 FT, MARK VIII, DESIGN LCM-8
1. General. This appendix provides detailed instructions for preparation of the mechanized landing craft, design LCM-8,
for dynamic dehumidification.
2. Preparation Instructions. a. Disassembly and Storage.
(1) Cab. The following Items will be removed, identified, and stowed in the cab:
(a) Drain plugs.
(b) Docking plugs.
(2) Lazaret. The following items will be removed, Identified, and stored in the Lazaret:
(a) Navigation lights.
(b) Stanchions, lifelines, and fittings.
(c) Deck plate keys.
(d) Horn.
(e) Emergency tiller.
(g) Ventilator cowls.
(h) Tiller deck plate.
(i) Hand bilge pump access plates.
(j) The masts will be removed, identified and stowed in the engine room.
(3) Exhaust manifold. The exhaust pipe will be removed from the manifold to permit circulation of air.
(4) Ramp door. Treat the accessible surfaces of the interior of ramp door between the front and backing
plates with rust arresting compound conforming to MIL-R-10036.
b. Preparation for Dynamic Dehumidification.
(1) Dehumidified area.
A dynamic dehumidification system will be installed to provide dynamic
dehumidification of the cab, and engine room, the ramp cylinder compartment and the Lazaret. Dry air lines and moist
air return lines will be run to each of those areas, generally as shown on figures 9 and 10. However, for the purpose of
air tightness, these areas will be considered as a single zone, with no attempt to seal between individual zones.
(2) Ventilation of wing compartment. Galvanized gooseneck or turbine type ventilators will be secured over
the openings resulting from removal of hand bilge pump access plates. Drain plugs under void spaces will be removed,
identified and secured to steering section of the operators cab.
(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 x 1 inch angle
irons in accordance with figure 12. The length of the angle irons will equal the outside longitudinal of the cab. The
vertical faces will be cut back the thickness of the cab bulkheads. The sheet metal will be formed to provide a lip of
approximately 2 inches all around. All seams will be sealed to the cab with 4 inch wide pressure sensitive tape applied
all around the lip. The roof, the tape and adjacent surfaces will be coated with strippable coating and bituminous coating.
2. Accesses. The accesses will be blanked with No. 20 gage galvanized sheet metal covers. The
covers will be secured to cab bulkheads by means of riveted clips, or cutting and offsetting tabs on each of the four
edges. The edges of covers will be sealed to the cab with 4 inch pressure sensitive tape and then coated with strippable
coating and bituminous coating.
3. Drains and peepholes. Drains and peepholes will be masked with pressure sensitive tape and
then coated with strippable coating and bituminous coating.
(b) Access hatches. The access hatches to the engine room and Lazaret will be sealed by troweling
bituminous coating into the aperture between the coaming and the closed cover.
(c) Ventilator trunk openings. The openings resulting from removal of the ventilator cowls will be
plugged or capped, using 4 inch exterior gradel plywood or NO. 20 gage galvanized sheet metal, securely fastened and
coated with strippable coating and bituminous coating. The plugs or caps over the vent trunk openings used for
dehumidification system air ducts (figure 9 or 10) will be provided with holes of sufficient size to permit the entry of the
air ducts.
(d) Fuel fill deckplates. The fuel fill deckplates will be sealed with strippable coating and bituminous
coating.
(e) Sea-chest vents. The vents will be fitted with pipe plugs or masked with pressure-sensitive tape and
sealed with strippable coating and
Change 2 C-1,
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