The three-position toggle switch is labeled
labeled PLA AT IDLE is next. It illuminates green
STATUS, OFF, and ALARM. If it is in the OFF
when the PLA is at the 0 percent setting. Below
position, testing of the alarm and status indicators
it is a status indicator labeled COOLING AIR
is inhibited. In the ALARM position, the alarm
SYS READY. It illuminates green when the vent
damper is open and the cooling fan is operating
indicators on the panel selected by the rotary
selector switch will be tested. In the STATUS
properly. A push button, labeled INITIATE, is
position, the status indicators on the panel selected
at the top of the next column on the DD console.
by the rotary selector switch will be tested. The
It is used to manually initiate a start.
On the CG console, a status indicator is at the
eight-position rotary selector switch is labeled
position of the INITIATE push button on the DD
ENG 2 AUX, 2B, 2A, MIMIC EOT, 1B, 1A,
ENG 1 AUX, and AUX.
console. This status indicator is labeled INHIB
START MRG PRESS LO. It illuminates to alert
the PACC operator to check the MRG LO
pressure before initiating a start and will not allow
GTM 2B START/GTM 2B STOP Section
a start of the GTM while illuminated. Below this
This section is used by the PACC operator to
indicator is a status indicator labeled GG AT
start/stop the GTM. It has 9 status indicators
IGNITION SPD. It illuminates green when the
(10 on the CG console) and 3 alarm indicators,
GG speed is > 1200 rpm. The next status indicator
a start initiate push button, a three-position rotary
is labeled IGNITION and illuminates green when
start/stop mode selector switch, a stop cancel push
T5.4 is > 400F. The last status indicator under
button, and a stop initiate push button.
the 2B START heading is labeled START COM-
PLETE. It illuminates green when GG speed is
Under the heading 2B START is the first
> 4300 rpm.
To the right of these indicators, under the
alarm indicator, labeled FALSE START. It
illuminates amber if one of two conditions has
heading START/STOP MODE, is the three-
occurred: (1) < 1200 NGG 20 seconds after the
position rotary switch. The three positions are
start air valve opens; (2) T5.4 < 400F 40 seconds
labeled AUTO INITIATE, MANUAL INITIATE,
after the main fuel valves open at 1200 NG G. The
and MANUAL CONTROL. This switch is used
next indicator is labeled ALIGN START AIR
by the PACC operator to select the starting and
SYSTEM and is a dual status/alarm indicator. As
stopping modes.
a status indicator, it illuminates amber in a steady
Under the heading 2B STOP is an alarm
indicator, three status indicators, and the last two
state to show the air start system is being aligned
push buttons. The alarm indicator is labeled
for start. As an alarm indicator, it comes on
INTERNAL FIRE and illuminates amber if an
flashing to show the air start system will not
internal (post-shutdown) fire occurs. This alarm
properly align (either valve failed to properly
position or anti-icing air is on). Below this
indicator illuminates if T5.4 is > 700F 3 minutes
indicator is the status indicator labeled START
after the shutdown is complete. The status
indicator labeled STOP INITIATED illuminates
ALIGN COMPLETE. It illuminates green after
green when a stop has been initiated. The status
the logic circuits check alignment of the
following: GTM in service, start air system
indicator labeled PLA AT IDLE illuminates green
aligned, HP start priority check, fuel temperature,
when the PLA has come to the idle (0 percent)
position. When this indicator illuminates, a
and bleed air valve closed. A status indicator
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