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TB 55-1900-232-10
(Text continued from page 4-8.)
If the steering gear is hydraulic, the rams can be secured by positioning the rudder amidships and securing the hydraulic
system in an attempt to maintain a hydraulic lock. Sheet rubber is wrapped around the piston and split pipe is cut to the
proper length such that the ends bear against the cylinders and/or yoke. The split pipe should be secured in place with
bands. Added security could be provided by welding a plate/structural member to the yoke and to the foundation or
ship's structure. Refer to Figure 3-5.
If the steering gear is a yoke or tiller arm-type, then structural steel can be welded across the tiller arm for suitable ship's
structure on either side. As above, engineering calculations should be accomplished to ensure that the securing device
and ship's structure are adequate. Figure 3-5, Sheet 2 depicts an example or such an arrangement.
It may not always be feasible to utilize any of the illustrated arrangements, as in the cases of rescue and towing at sea
and unfavorable weather conditions. A temporary means may then be employed. Chain falls or come-alongs may also
be used in conjunction with tiller arms or quadrants. The use of wire rope should be avoided in favor of chain wherever
practicable. Ram hydraulic systems may be isolated in some installations to assist rudder locking. These methods are
only temporary, a permanent locking arrangement should be installed.
For a manned tow, if the steering machinery is operable and reliable, a decision may be made to steer the tow. In this
connection, see Paragraph 3-5.3.6.
3-2.7.7 Navigation Lights. The preparing activity must ensure that the tow is equipped with the proper navigation lights.
Specific requirements concerning the correct positioning, number and color of lights are contained in the appropriate
COLREGS (Ref. 2).
3-2.7.8 Electrical Systems. Electrical power may be required on the tow for the following systems:
a. Fire alarms
b. Lights
c. Flooding alarms (audible and visual)
d. Pumps
e. Communications equipment
f. Crew accommodations
g. Winches/capstans
h. Radiological alarms.
To ensure reliable operation, these systems periodically should be inspected and tested. If electrical power on the tow is
supplied by an installed or portable generator, a sufficient amount of fuel for the tow should be provided. A simple rule of
thumb is to allow two gallons of fuel per day per generator horse-power on the tow.
For battery-powered systems, the batteries should be checked for capacity and condition. Batteries exposed to the
weather must be protected in watertight containers that will not permit the batteries to leak to ground. It is essential that
all exposed wires and connections be adequately waterproofed.  Wires should be secured to prevent chafing and
grounding. Provisions must be made to vent hydrogen gas from the batteries. Two items of equipment are available to
aid in conserving battery power-a solar or light-sensitive switch that will turn the lights on at dusk and off at dawn, and a
compact solar generating panel that will recharge the batteries during daylight hours.
3-2.7.9 Crew Accommodations. Vessels with riding crews should be provided with adequate berthing and messing
facilities, including sanitary facilities and ventilation.
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