A manual mode of starting the GTE from the PCC
Air System
is available provided the 18 permissive conditions
There are three main air systems associated with the
r e q u i r e d are satisfied. The READY TO START
indicator illuminates when all 18 pre-start permissive
start air for the GTEs: (1) the bleed air system, (2) the
conditions are met. T h e S T A R T E R O N
high-pressure air system, and (3) the emergency start air
momentary-action push button will begin the manual
system from the start air compressors (SAC). The SACS
starting sequence. The command to the start/stop
are driven by the diesel generators.
sequencer located in the FSEE enables the starter to turn
The bleed air system provides air for the starter,
the gas turbine. The start/stop sequencer provides the
masker, prairie, and anti-icing air systems. The bleed air
time sequence and engine parameters for information
system can be supplied by either of the running GTEs.
only. The IGNITION ON and FUEL ON push-button
An electric motor-operated bleed air valve is located in
switches on the PCC must be manually operated to
each bleed air line inside the module enclosure. This
provide the commands.
valve is opened and closed with the BLEED AIR
The automatic (program) mode starts the associated
VALVE OPEN/CLOSE push-button indicating switch
G T E with automatic timed commands from the
on the PCC. The bleed air lines direct the bleed air to
start/stop sequencer in the FSEE. The same permissive
both the anti-icing system associated with the respective
as in a manual start must be satisfied before the engine
gas turbine engine and the check valve leading to the
can be started. The auto sequence START push button
bleed air system header.
i n i t i a t e s the auto start command to the start/stop
Each gas generator provides the bleed air for
sequencer. The start/stop sequencer that initiates the
anti-icing for its associated intake system and intake
IGNITION ON and FUEL ON commands as acceptable
plenum. The solenoid-operated bleed air shut-off valve
parameters are detected by the FSEE.
and the motor-operated anti-icing valve have control
Three different methods for securing a GTE are
alternate-action push-button switches and split-legend
available at the PCC. These methods are normal stop,
indicators on the PCC. The anti-icing system splits into
manual stop, and emergency stop. The engine also can
two branch lines. One line is for downstream of the
b e shut down automatically either during a start
moisture separators with a manual valve that is normally
sequence or while running by detection of certain faults.
open. The other line is for anti-icing upstream of the
A normal stop can be initiated by the operator in
moisture separators with an isolation valve that is
either the programmed control mode or the manual
normally closed.
control mode. The manual stop must be used if control
was transferred from the local operating panel (LOP) to
GTE Control System
the PCC after starting the engine. A normal stop is
initiated by depressing the NORMAL STOP
There are three modes that can be selected at the
alternate-action push-button switch. A normal stop can
PCC by a three-position switch: OFF LINE,
be aborted at any time before the automatic fuel
MANUAL, and AUTOMATIC. The engine 1A and 1B
shutdown valve closes by advancing the gas generator
start panels are mirror images of each other. They
speed above idle.
provide the same controls and indicators presented in
A manual stop is initiated by the operator either in
the following four subsystems:
programmed control mode or in the remote manual
1. Pre-start status
control mode. Before a manual stop is initiated, the gas
2. Starting systems
generator should be run at idle speed for 5 minutes to
allow the engine parts to cool evenly. A manual stop uses
3. Engine water-wash group
the circuitry in the start/stop sequencer to stop the GTE.
4. Sequencer mode switch
The manual stop command, provided by depressing the
MANUAL STOP push-button switch, causes both
The off-line auxiliary mode is used for motoring and
automatic fuel shutdown valves to close.
maintenance. The fuel and ignition cannot be enabled
simultaneously in the off-line mode. Tests of either the
An emergency stop can be initiated by the operator
ignition or fuel control system without starting the GTE
at any time, in any control mode, and without regard to
is accomplished in the off-line mode. An engine water
which console has GTE control. The EMERGENCY
STOP OVERRIDE switch at the LOP must not be
wash is also accomplished in this mode.
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