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compensator is not covered, the EICAS FUEL QTY display will show
9000 pounds in each wing and 18,000 pounds total.) The EICAS
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FUEL QTY display will also be amber. During the test, the amber
LOW FUEL warning lights on the standby fuel quantity indicator will
flash for approximately 30 seconds and then illuminate steady. In
addition, the amber L-R FUEL LEVEL LOW caution messages will
be displayed on CAS. With the test completed, releasing the TEST
switch returns the displays to indicating actual fuel quantity and
extinguishes the amber LOW FUEL warning lights.
A switchlight, labeled FUEL QTY IND, is installed immediately to the
right of standby fuel quantity indicator. When depressed, standby
fuel quantity indicator display is inhibited. When extended, normal
display is available. The FUEL QTY IND switchlight legend is blue in
color and is always illuminated.
Power for the standby fuel quantity indication system is provided by
the Essential DC bus. It remains functional all the way down to, and
including, Emergency Battery (E-BATT) operation.
B. Fuel Low Level Warning System:
The fuel low level warning system (Figure 11) consists of a temperaturesensitive
thermistor in each hopper, a dual-circuit control unit and two
amber LOW FUEL lights on the standby fuel quantity indicator. The system
receives power from the Essential DC bus.
When the hoppers are full, fuel covers the thermistor and the control units
maintains its two warning relays in the energized position. No warnings are
displayed in this state.
If a hopper’s fuel level drops below approximately 650 pounds (295 kg), it
exposes the thermistor to air. Because there is always a difference
between fuel temperature and air (or fuel / air vapor) temperature,
resistance changes in the thermistor. The control units senses this change
in resistance and de-energizes the respective warning relay. When the
relay is de-energized, it provides a signal to the fuel quantity signal
conditioner.
The signal conditioner, in turn, flashes the respective amber LOW FUEL
light on the standby fuel quantity indicator for 30 seconds to alert the flight
crew, then reverts to steady illumination. The signal conditioner also
provides a signal to EICAS to display the appropriate cautions. An amber
L-R FUEL LEVEL LOW message is displayed on CAS; the respective
FUEL QTY display changes to amber. If a low fuel condition in both wings
is detected, the entire FUEL QTY display changes to amber.
C. Fuel Temperature Indication System:
A resistance-type temperature bulb in the left fuel hopper provides a signal
to DAU No. 1. DAU No. 1 then sends the signal to EICAS for display on the
FUEL system page as fuel tank temperature (FUEL TANK TEMP). Fuel
tank temperature is displayed in 1° C resolution within a normal operating
range of -40° C to 54° C.
Depending on fuel temperature, the EICAS displays the temperature
reading with either white or red digits, as listed in the Limitations portion of
this section.
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3. Controls and Indications:
A. Circuit Breakers (CBs):
Circuit Breaker
Name:
CB Panel: Location: Power Source:
FUEL LOW LEVEL PO B-1 Emergency Battery
Bus
L FUEL QTY PO C-1 Essential DC Bus
R FUEL QTY PO D-1 Essential DC Bus
B. Caution (Amber) Messages and Annunciations:
CAS Message: Cause or Meaning:
L-R FUEL LEVEL LOW Fuel level in hopper is below approximately 650 lb (295
kg).
Annunciation: Cause or Meaning:
LOW FUEL light(s) (amber) illuminated
on standby fuel quantity indicator.
Fuel level in respective hopper is below
approximately 650 lb (295 kg).
4. Limitations:
A. Flight Manual Limitations:
Fuel Tank Temperature (FUEL TANK TEMP):
• 54° C and above: red digits
• -40° C to 54° C and above: white digits
• Less than -40° C: red digits
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2A-28-00 PRODUCTION AIRCRAFT SYSTEMS
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Fuel System Controls and
Indications
Figure 8
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Standby Fuel Quantity
System Controls and
Indications
Figure 9
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Fuel Quantity System
　
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