status indications of the start sequence to the
operations. When better maneuvering response is
operator. The start/stop sequencer will prohibit
needed, the throttle is operated in the speed
a start until the prestart permissives have been met
control mode. In this mode the ship's speed is
and the READY TO START indicator on the
changed by changing the propeller pitch up to
PCC start panel is illuminated.
maximum with srpm remaining constant. In the
You can shut down (secure) the GTE by
speed mode, srpm remains constant while built-in
selecting one of the three operator-initiated
power schedules of the program vary GTE speed.
modes. The fourth mode is a processor-generated
The speed mode is also called closed-loop,
shutdown. The modes of stopping are as follows:
constant shaft speed mode.
Normal stop--operator initiated
Manual stop--operator initiated
The programmed control mode must not
Emergency stop--operator initiated
be used when the propeller blade pitch is
Automatic shutdown--logic initiated
being controlled from the OD box or when
it has been locked in the full-ahead posi-
Normal stops are performed in the remote
tion. Since no input has been made to the
manual mode. The operator, following the EOSS,
processor that the propeller blade pitch is
must bring the GTE to idle. When the normal stop
being operated manually or has been locked
push button is depressed, it initiates a normal stop
in the full-ahead position, the processor
sequence, performed by the start/stop sequencer.
would continue computing and transmitting
This allows the GTE to run for 5 minutes at idle
before fuel valve closure, which allows the GTE
in damage to the equipment.
temperatures to equalize (cool). This cooldown
period lengthens GTE life. A normal stop
Remote Manual Mode
sequence may be cancelled by the operator
The remote manual mode at the PCC is used
moving the throttle control lever off idle
when a GTE is started from the PCC. It is also
an alternate method of operating the propulsion
The PCC operator may perform manual stops
equipment if a programmed control failure
from the PCC in the remote manual mode. The
occurs. This method requires the operation of
operator is required to sequence this stop. The
GTE should be run at idle for 5 minutes before
the speed of each GTE. Normally, a combination
the GTE is manually stopped.
of programmed control and remote manual
The PCC operator may activate the emergency
control is used only when GTEs are started or
stop at any time and in any operating mode,
stopped, when maintenance is performed, or
regardless of the console in control. You can
when damage has occurred. When one GTE is in
initiate the emergency stop by depressing the
programmed control and the other is in remote
emergency stop push button. This causes the
manual, the remote manual pitch lever is
GTE's fuel valves to close.
inoperative. The pitch is controlled by the
Automatic shutdowns may occur during starts
programmed control lever.
or when the GTE is running. The automatic
shutdowns de-energize the fuel valves, causing
GTE STARTING AND STOPPING
the GTE to shut down. The conditions during
start that cause an automatic shutdown are as
You can start a GTE from the PCC in the
automatic or manual mode. In the automatic
mode, the operator initiates the start at the PCC.
NGG fails to reach 1200 rpm within 20
The start/stop sequencer in the FSEE will start
seconds after start is initiated.
the GTE. The sequencer also provides the status
Failure to reach 400°F T5.4 within 40
indications for the operator to follow the start
seconds after the fuel valves are energized.
sequence. Automatic starting is inhibited if the
18 prestart permissives have not been met and the
NGG fails to reach 4500 rpm within 90
READY TO START indicator at the PCC is
seconds after start is initiated.
Engine LO pressure is below 6 psig 45
Manual starts from the PCC require the
seconds after start is initiated or GTE
operator to activate circuits and sequence the start
speed is above 4500 ± 200 rpm.
manually. The start/stop sequencer provides