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 TB 740-97-4
APPENDIX J
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
LIGHTER, AMPHIBIOUS (LARC-V), SELF-PROPELLER,
ALUMINUM, 5-TON, DESIGN 8005
1.
General. This appendix provides detailed instructions for preparation of the amphibious lighter (LARC-V), design 9005 for
dynamic dehumidification.
2.
Preparation Instructions. a. Disassembly and Stowage.
(1) Windshield wipers, horn, compass, radio antenna and mast range light, if installed, shall be removed, tagged for
identification and packaged to prevent breakage and stowed in forward compartment.
(2) Anchor life line and life preserver will be stowed in forward compartment.
(3) Anchor and boat hook will be stowed in transfer case hatch.
(4) Bulwark panels complete with cables and end bars shall be removed, If installed, and rolled to the smallest practical
size, wrapped in barrier material conforming to PPP-B-1055, sealed with tape, conforming to PPP-T-60, and identified to the hull
number from which removed and stowed in the transmission hatch.
(5) Remove the fabric canopy top and back sections (hull number below 732) and the fabric back section of LARC-V's
with metal canopy (hull number above 732). Wrap fabric canopy in barrier material conforming to PPP-B-1055, seal with tape, PPP-
T-60, taking care not to crease the transparent panels. Package metal retaining strip and screws, identify by hull number, attach to
fabric canopy and store in transmission hatch.
b. Preparation for Dynamic Dehumidification .
(1) Dehumidified Area. The cab and all Interior surfaces of the lighter will be prepared for dehumidification.
(2) Provisions for ventilation and air circulation .
(a) Method 1 --Figures 33 and 34. The forward hatch cover and the air intake retainer and screen on the engine
hatch assembly will be removed and stowed in the forward hatch. The resulting openings will be covered with blanks fabricated from
exterior grade plywood or sheet metal. The blanks will each be provided with a hole to receive a four inch duct for the passage of air.
On lighters having air intake openings on both sides of the engine hatch center support, the openings will be covered with blanks as
specified above. One blank on either side may be utilized for introduction of the air duct. The blank over the moist air outlet will also
be provided with a hole for mounting of a sensing element. In addition, the moist air outlet blank of every fourth lighter will be
provided with a hole to receive a humidistat cable.
(b) Method II --Figure 35.
1. Engine compartment and forward hatches shall be sealed by drawing existing hatch cover gasket down
on coaming and applying a bead of sealing to the aperture between the hatch and coaming. The latch penetrations shall be sealed
with strippable compound. Remove the hull access plate to the lower radiator hose in two opposite LARC-V's, tag for identification
and stow in operator's cab. Fabricate No. 26 gauge galvanized sheet metal flanged adapter fitting to connect ducting to opening
utilizing existing bolting ring for attachment.
operators cab. Fabricate no. 26 gauge galvanized sheet metal flanged adapter fittings to connect ducting to openings, utilizing
existing bolting pad for attachment.
NOTE
Blanks and panels fabricated from metal dissimilar to the lighter hull will be coated or otherwise insulated at points of
contact with hull.
(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, fuel tank vents, heater exhaust outlets and any and all other hull openings found
to be a source of leakage will be sealed with pressure sensitive tape, strippable coating, and bituminous coating.
Change 2
J-1
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