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
required are satisfied. The READY TO START
start air for the GTEs: (1) the bleed air system, (2) the
indicator illuminates when all 18 pre-start permissive
high-pressure air system, and (3) the emergency start air
conditions are met. The STARTER ON momentary-
system from the start air compressors (SACs). The
action push button will begin the manual starting
sequence. The command to the start/stop sequencer
SACs are driven by the diesel generators.
located in the FSEE enables the starter to turn the gas
The bleed air system provides air for starter air,
turbine. The start/stop sequencer provides the time
masker air, prairie air, and anti-icing air. The bleed air
sequence and engine parameters for information only,
system can be supplied by either of the running GTEs.
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. The
provide the commands.
operator at the PCC can open and close this valve by
The automatic (program) mode starts the associated
using the BLEED AIR VALVE OPEN/CLOSE
GTE with automatic timed commands from the
push-button indicating switch. The bleed air lines will
start/stop sequencer in the FSEE. The same permissive
direct the bleed air to both the anti-icing system
as in a manual start must be satisfied before the engine
associated with the respective GTE and the check valve
can be started. The auto sequence START push button
leading to the bleed air system header.
initiates 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. At the PCC, the operator can use the control
parameters are detected by the FSEE.
alternate-action push-button switches and split-legend
Three different methods for securing a GTE are
indicators to control the solenoid-operated bleed air
available at the PCC: (1) normal stop, (2) manual stop,
shut-off valve and the motor-operated anti-icing valve.
and (3) emergency stop. The engine will also be shut
The anti-icing system splits into two branch lines. One
down automatically either during a start sequence or
line is for downstream of the moisture separators with a
while running if certain faults are detected.
manual valve that is normally open. The other line is for
To initiate a normal stop, the operator can use either
anti-icing upstream of the moisture separators with an
the programmed control mode or the manual control
isolation valve that is normally closed.
mode. The operator must use the manual stop, however,
if control was transferred from the local operating panel
GTE Control System
(LOP) to the PCC after the engine was started. The
operator initiates a normal stop by depressing the
At the PCC, the operator can use a three-position
NORMAL STOP alternate-action push-button switch. A
switch to select the following three modes: (1) OFF
normal stop can be aborted at any time before the
LINE, (2) MANUAL, and (3) AUTOMATIC. The
automatic fuel shutdown valve closes by advancing the
engine 1A and 1B start panels are mirror images of each
gas generator speed above idle.
other. They provide the same controls and indicators
The operator can initiate a manual stop in either the
presented in the following four subsystems:
programmed control mode or the remote manual control
1. Pre-start status
mode. Before initiating a manual stop, the operator
2. Starting systems
should make sure the gas generator is run at idle speed
for 5 minutes. This precaution allows the engine parts
3. Engine water-wash group
to cool evenly. A manual stop uses the circuitry in the
4. Sequencer mode switch
start/stop sequencer to stop the GTE. To provide the
manual stop command, the operator depresses the
The off-line auxiliary mode is used for motoring and
MANUAL STOP push-button switch. This action
maintenance. In the off-line mode, the fuel and ignition
causes both automatic fuel shutdown valves to close.
cannot be enabled simultaneously. Tests of either the
ignition or fuel control system without starting the GTE
The operator can initiate an emergency stop at any
is accomplished in the off-line mode. An engine water
time, in any control mode, and without regard as to
which console has GTE control. The EMERGENCY
wash is also accomplished in this mode.
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