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 TM 55-1905-223-SDC
Information available to evaluate the LCU's stability is provided in the following documents:
a. The Curves of statical stability (intact). The curve of statical stability, and its properties, are an
index of the ship's transverse stability of a given condition of loading. These properties include metacentric
height (GM), maximum righting arm (GZ) and the angle of inclination-Θ at which it occurs, range of stability
and dynamic stability. For the LCU, the beaching condition and the full-load departure condition represent the
upper and lower limits of the operating range. Curves of intact statical stability for these conditions are shown
in the Trim and Stability Booklet. On rare occasions such as entering dry-dock or when lightened for retraction
from a beach, the ship may approach light, condition; a curve for this
case is also shown. It is evident that the range of positive stability is adequate for all normal considerations.
b. Damage stability calculations. At or below the drafts of 7.6 feet above the bottom of keel
amidships and 7.74 feet above the bottom of keel at the after perpendicular before damage, calculations
indicate that these LCUs should be able to survive the flooding of any one compartment without loss by
foundering or capsizing. As an indication of the effects of a typical single compartment damage, the
calculations after damage are furnished in the Damage Stability Booklet. Calculations are shown for the
beaching, full-load departure, and full-load arrival conditions. Calculations indicate that the fully loaded ship
will survive flooding of multiple tanks as follows:
(1) #1 Center Sea Water Ballast and #2 Port (or Starboard) SWB.
(2) #2 Port (or Starboard) SWBD and #3 Port (or Starboard) FO.
(3) #3 Port (or Starboard) FO and #4 Port (or Starboard) FO.
(4) #4 Port (or Starboard) FO and #5 Port (or Starboard) SWB.
Section VIII. MEASURES TO SAFEGUARD STABILITY
5-27. STANDARDS. The ship meets a single compartment standard in conformance with U.S. Coast Guard
rules, including the engine room.
5-28. STABILITY CONDITIONS. Several damage stability conditions are analyzed in the Trim and Stability
Booklet to provide the ship's personnel an understanding of the LCU's capability to withstand damage
resulting in flooding. Two loading conditions are investigated, full-load departure and full-load arrival.
5-29. WEIGHT AND MOMENT COMPENSATION. Any increase in the weight of the ship must be avoided
since the single compartment standard must be preserved. Weight compensation by weight removals is
required before any weight is added. These removals can be made from any level as stability is not critical.
LIOUID LOADING INSTRUCTION. Diesel oil may be drawn from any tank in any sequence.
5-30.
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