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 TB 740-97-4
APPENDIX K
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
LIGHTER, AMPHIBIOUS (LARC-XV), SELF-PROPELLED,
ALUMINUM, 15-TON, DESIGN 8004
1. General. This appendix provides detailed Instructions for preparation of the amphibious lighter (LARC-XV), design
8004, for dynamic dehumidification.
2. Preparation Instructions. a. Disassembly and Stowage.
(1) Remove weather exposed horns, range height, and windshield wiper blades and rms, tag, package fragile items
a
in fiberboard boxes, and stow in operator's cab.
(2) Remove life ring and life ring line holding strap, bag, tag for identification; and stow in operator's CAB.
(3) Remove compass, life preserver, spotlights, trouble lights, and bulwark panels; individually package in fiberboard
boxes, identify, and stow in transmission compartment.
(4) Remove antenna and stow in forward hatch.
(5) Plastic bubble dome. The plastic dome shall be removed, Identified to the hull numbe from which removed,
r
tagged for identification, packed to prevent damage, and stored In a protected location, warehouse preferably.
b. Preparation for Dynamic Dehumidification.
(1) Dehumidified area. The cab, engine compartment, and the differential and transfer transmission area will be
prepared for dehumidification.
(2) Provisions for ventilation and air circulation.
(a) Method 1 (fig 38). The quick opening hatch leading into the transfer transmission area, the starboard side
engine hatch cover on the lighter, from which the moist air is returned, and the port engine hatch cover of the lighter, where
the dry air is introduced, will be removed and stowed In the cab. The resulting openings will be covered with blanks
fabricated from exterior grade plywood or sheet metal. All blanks, except the one over the dry-air inlet, will be provided
with two holes: One for a four-inch duct for passage of air; and one for mounting of a sensing element. The blank over the
moist-air outlet will be provided with one additional hole to receive a humidistat cable.
(b) Method 2 (fig. 39). Fabricate and install No. 20 gage galvanized sheet metal covers over upper and lower
fan drive compartments grills and secure in place by use of existing grill bolts. Provide a 3-inch hole and slip joint
connection, one blank for lower grill of each lighter for dry-air D/H ducting. Remove the two adjacent fuel oil filler caps,
bag with attaching screws, tag for identification, and stow in operator's cab. Fabricate No. 26-gage galvanized sheet
metal, 90 angle adapters for ducting cross-connection between lighters. Remove hose from hydraulic, bilge pump,
suction pipe to provide opening to hull interior for installation of humidity sensing elements.
NOTE
Blanks and panels fabricated from sheet metal dissimilar to the lighter hull will be coated or otherwise
insulated at points of contact with hull. To permit maximum circulation of air within the dehumidified
zones, all manhole covers, handhole covers, and inspection plates on equipment located in dehumidified
areas will be removed and secured in other than normal position. The hatch cover and inspection plates
located in the floor of the cab will be secured in an open position.
(3) Sealing for dehumidification. Materials and methods used in sealing for dehumidification will be in accordance
with this bulletin. Detailed sealing requirements are outlined below:
(a) Hull openings. Pump outlets and all other openings found to be a source of leakage will be sealed with
pressure-sensitive tape, strippable compound, and bituminous coating.
(b)
Exhaust pipes. Exhaust pipes will be plugged and sealed with strippable coating to prevent passage of air.
(c) Cab openings. Fabricate and install No 20 gage galvanized sheet metal covers or plywood over the cab
windows and coaming resulting from
Change 2 K-1
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