it is a red indicator that illuminates when the
temperature is sensed at the FO heater outlet and
differential pressure across the fuel coalescer
the FO system pressure is sensed at the coalescer
exceeds 30 psid. The alarm indicator labeled
outlet. A second meter, located to the right of the
FILTER WATER HI is a red indicator. When it
HEADER dual-indicating meter was originally
is illuminated, the water level in the fuel coalescer
designed for this console. It has been deleted by
is high. The alarm indicator labeled SUCTION
design changes and the space on the console
STR Ć P HI is a red indicator. When it is
blanked off.
illuminated, the differential pressure across the
FO suction strainer exceeds 4 psid. The alarm
indicator labeled HEADER TEMP HI/LO is a
red indicator. When it is illuminated, the header
FO temperature either exceeds 130F or is below
80F. The alarm indicator labeled DRAIN TANK
LEVEL HI is a red indicator that indicates the
FO leak detection tank fuel level exceeds 2.5
gallons. The alarm indicator labeled HEATER
TEMP HI illuminates red to indicate that the FO
heater discharge temperature is > 140F. The last
alarm indicator labeled HEADER PRESS LO
illuminates red when the FO header pressure is
< 40 psig.
The next group of alarm and status indicators
are pairs of functionally identical indicators. The
first pair of alarm indicators labeled FILTER B
BLOCKED and FILTER A BLOCKED are
amber indicators. When they illuminate, the
differential pressure across their respective
coalescer exceeds 25 psid. Below this pair are two
status indicators labeled GTM B BYPASS OPEN
and GTM A BYPASS OPEN. These two status
indicators were part of the original system design,
but due to later system modifications, neither
indicator is functional. The next pair of status
indicators TK B SUCT VALVE OPEN and TK
A SUCT VALVE OPEN are green indicators.
They illuminate when their respective FO service
tank suction valves open. Next are two status
indicators labeled TK B SUCT VALVE CLOSED
and TK A SUCT VALVE CLOSED. They
illuminate red when their respective FO service
tank suction valves close. Next are two status
indicators labeled TK B RECIRC VALVE OPEN
and TK A RECIRC VALVE OPEN. They
illuminate green when their respective FO service
tank recirculating valves open. The last pair of
status indicators are labeled TK B RECIRC
VALVE CLOSED and TK A RECIRC VALVE
CLOSED. They illuminate red when their
respective FO service tank recirculating valves
close.
Under the label SERVICE TANK VALVES
Under the label HEADER is a dual-indicating
are two covered toggle control switches. They are
meter. This meter monitors the TEMP and
a pair of functionally identical switches labeled
PRESS of the FO system. The FO system
B OPEN/CLOSED and A OPEN/CLOSED.
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