START SUBSECTION.--The start half of
START/STOP SELF TEST Section
the panel has two alarm indicators, six status
indicators, two push buttons, and a rotary select
This section is used to conduct a static test of
switch. The two alarm indicators are as follows:
the start sequencer, normal and emergency stop
circuits, and the cooling air monitor circuit cards
FALSE START--This alarm indicates one
of either GTM A or GTM B. It has two push
of two alarm conditions: (1) < 1200 NGG,
buttons, two rotary selector switches, and eight
20 seconds after the start air valve opens;
status indicators. These buttons, switches, and
(2) T5.4 less 400F, 40 seconds after the
indicators are used in conjunction with procedural
main fuel valves open (1200 NGG).
steps outlined in the EOP and table 2-16 of
NAVSEA S9234-BT-MMO-010, Propulsion
ALIGN START AIR SYSTEM--This is
Local Operating Equipment (PLOE), Volume 1.
actually a dual-function (status and an
alarm) indicator. As a status indicator, it
GTM B Section
comes on steady to show the air start
system is being aligned for a start. As an
This section is used to start and stop the GTM.
alarm indicator, it comes on flashing to
It is divided into two subsections labeled STOP
show the air start system will not properly
and START.
align (either the valves failed to properly
position or anti-icing air is on).
STOP SUBSECTION.--This portion of the
panel has one alarm indicator, five push buttons,
The status indicators are as follows:
and three status indicators. The alarm indicator
START ALIGN COMPLETE--It illu-
is labeled INTERNAL FIRE. It is an alarm that
indicates an internal (post-shutdown) fire. If 3
minates after the logic circuits check
minutes after shutdown T5.4 is > 700 F, the
alignment of the following: (1) GTM in
service, (2) start air system aligned, (3) HP
alarm will activate.
The push buttons are active only when the
start priority check, (4) fuel temperature,
START/STOP MODE switch is in the MANUAL
and (5) bleed air valve closed.
INITIATE position. The push buttons are as
PLA AT IDLE--It illuminates to indicate
follows:
PLA is at 0 percent.
INITIATE --When depressed, it starts a
COOLING AIR SYS READY--It illu-
normal stop of the GTM.
minates to indicate the vent damper is open
and the cooling fan is operating properly.
CANCEL STOP--It is used to cancel a
normal stop of the GTM.
CG AT IGNITION SP--It illuminates to
indicate that GG speed is > 1200 rpm.
FIRE STOP RESET, EMER STOP
RESET, NORMAL STOP RESET--
IGNITION--It illuminates to indicate
These are logic circuitry reset push buttons
T5.4 is > 400F.
for each of the indicated sequences (active
even in manual control mode).
START COMPLETE--It illuminates to
indicate GG speed is > 4300 rpm. (Once
The status indicators are as follows:
the start logic has been reset, electronically,
the above status indicators extinguish.)
STOP INITIATED--It illuminates to
indicate a stop has been initiated.
The two push buttons are active only in the
MANUAL INITIATE mode. These two push
PLA AT IDLE--It illuminates to indicate
buttons are as follows:
when the PLA reaches idle. At idle, a
5-minute cool-down timer begins.
INITIATE --It is used to initiate a
MANUAL INITIATE start.
FUEL VALVES CLOSED--It Illuminates
RESET --It is used to reset the logic
when the cool-down period is over. After
cool down, the fuel valves close, which
circuitry for the MANUAL INITIATE
start sequence.
secures the GTM.
5-43
