has to start the GTE using the manual push
11. ENGINE NOT RUNNING--The NGG is
buttons and do the start sequencing.
less than 1200 rpm, T5.4 is less than
400°F, and fuel manifold pressure is less
START SEQUENCING.--The start sequencing
than 50 psig.
section (E, F, and G) has 10 push buttons and
12. ENCL FANS READY--The enclosure
indicators used to control or monitor the GTE
fan is ready to run depending upon
start. An additional indicator (H) in this section
indicates when the GTE is at idle. The automatic
13. PT BRAKE NOT ENGAGED--The PT
start section (E) has a push button and three
brake for that GTE is not engaged.
indicators used to start the GTE in the automatic
14. FUEL SUPPLY ON--One of the two
mode. The AUTO SEQUENCE START push
fuel tanks has more than 20 percent,
button is depressed to initiate the auto start
the fuel supply cutoff valve is open,
sequence in the start/stop sequencer. This action
and the fuel supply pressure is greater
will only start the sequence if the sequencer mode
than 8 psig.
select switch (D) is in AUTO, and the READY
15. SEQ NOT IN OFF-LINE MODE--The
TO START indicator (B) is illuminated. The first
sequencer mode switch is not in the off-
indicator to illuminate during an auto start
sequence is the STARTER RUNNING indicator.
16. COASTDOWN PUMP OFF--The MRG
This shows the starter regulator/shutoff valve is
coastdown pump is not running.
open. The next indication is for IGNITION ON.
17. THROTTLE AT IDLE--The GTE PLA
This indicator shows that the igniters are energized
is in the idle position.
through the start/stop sequencer. The third
18. HALON SYS READY--The Halon
indicator is a split-legend type that reads
inhibit switch is not on and the Halon
FUEL/FLAME. The FUEL indicator illuminates
system is ready.
when the fuel manifold pressure is greater than
50 psi. The FLAME indicator illuminates when
READY TO START.--The READY TO
Pt5.4 is greater than 400°F.
START indicator (B) only illuminates when the
The three center indicators (F) are used to
18 prestart permissives are met. The GTE is not
show out-of-tolerance conditions during a GTE
designed to be started in either the automatic or
start. These three conditions will also cause an
manual mode until this indicator illuminates.
automatic shutdown. These indicators are labeled
NGG FAIL TO REACH 1200 RPM, FAIL TO
STARTING SYSTEM SECTION.--The
LIGHT OFF, and NGG FAIL TO REACH 4500
STARTING SYSTEM section (C) has two
RPM. These indicators illuminate when the
indicators used to display abnormal conditions in
related condition occurs.
the starting air system. The STARTER AIR
The three manual start push buttons (G) are
PRESS LOW indicator illuminates when the
used to manually sequence the start/stop
starting air pressure drops below 35 psig as
sequencer during a manual start. The push
sensed by one of two pressure transducers. The
buttons are labeled STARTER ON, IGNITION
REGULATOR SHUTOFF VALVE FAIL TO
ON, and FUEL ON. These push buttons are used
CLOSE indicator illuminates when the start air
when the sequencer mode selector switch (D) is
valve on the GT has not closed and the GG speed
in the MANUAL or OFF LINE mode. When the
has reached 4900 rpm.
STARTER ON push button is depressed, it opens
the starter shutoff/regulator valve. Depressing it
again will close the valve, although it will
SEQUENCER MODE SELECTOR SWITCH.--
automatically close at 4500 rpm (NGG). The
The SEQUENCER MODE selector switch (D) is
IGNITION ON push button is a momentary
a three-position rotary switch used to determine
push-button switch. When this push button
the operating mode of the start/stop sequencer.
is depressed, it energizes the igniters. It de-
The three modes are OFF LINE, AUTO, and
energizes them when it is released. The FUEL ON
MANUAL. The off-line position will prevent the
push button is also a momentary-type switch.
GTE from being started at the PCC. This mode
Depressing it causes the fuel valves to open.
is normally used only during maintenance, water
During a start, these valves are latched open by
washing, and motoring. The auto position allows
the AUTO SEQUENCE START push button to
The ENGINE AT IDLE lamp (H) illuminates
be used to start the GTE using the start/stop
when NGG is between 4900 and 5000 rpm.
sequencer. In the manual position, the operator