Figure 10-11.--Rudder angle indicator (circuit N) and rudder angle order (circuit L).
STEERING EMERGENCY ALARM
The steering emergency alarm signal circuit
(circuit LB) provides a means by which the pilothouse
can alert the steering gear room watch that a
steering emergency has occurred and that the trick
wheel must be used to steer the ship.
A spring return lever switch is located on the
steering control console, and a siren is located in the
steering gear room. The helmsman operates the switch
to energize the siren when normal steering control is
lost. When the siren sounds in the steering gear room,
the steering gear room watch immediately engages the
trick wheel and takes control of steering the ship.
Since gears are used in most of the equipment that
we are discussing in this chapter for changing the
Figure 10-12.--Rudder angle order Indicator
direction or speed of an input, or for converting an
(circuits L and N).
electrical input to a mechanical input and vice versa,
it is essential that we discuss the different types of
gears and their functions.
steering gear room watch can anticipate a
rudder angle order change. When operated, the
FUNCTIONS OF GEARS
transmitter sends the desired rudder angle in
degrees left or right to the combination rudder
Gears have three functions: they change the
angle order indicator in the steering gear room.
direction of motion; they change the speed of motion;
The steering gear room watch then positions the
and they change the force by changing the
trick wheel to cause the rudder angle order
indicator to match the order.