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17 Cards in this Set
- Front
- Back
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Which fuel tank is used first?
How? |
Both engines are normally pressure fed from the center tank until the center
tank quantity decreases to near zero. The engines are normally then pressure fed from their respective main tanks. Center tank pumps produce higher pressure than main tank pumps. This ensures that center tank fuel is used before main tank fuel, even though all fuel pumps are operating. |
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Which tanks can the engines suction feed from?
How? |
When main tank fuel pump pressure is low, each engine can draw fuel from its
corresponding main tank through a suction feed line that bypasses the pumps. |
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What problems could occur when suction feeding?
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As the aircraft climbs, dissolved air is released from the fuel in the tank due to the
decrease in air pressure. This air may collect in the suction feed line and restrict fuel flow. At high altitude, thrust deterioration or engine flameout may occur as a result of the fuel flow reduction. |
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How are the engine fuel manifolds interconnected?
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Crossfeed valve.
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How is the crossfeed valve powered and operated?
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DC motor powered by from the hot battery bus.
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How are the spar fuel shutoff valves powered and operated?
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DC motor operated and powered from the hot battery bus.
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How are engine fuel shutoff valves powered and operated?
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The engine fuel shutoff valves are fuel actuated, solenoid controlled valves powered from the battery
bus. |
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When are the spar fuel shutoff valve and engine fuel shutoff valve closed?
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Both the spar fuel shutoff valve and the engine fuel shutoff valve close
whenever their respective engine fire switch is pulled or engine start lever is placed to CUTOFF. |
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Where is the fuel temperature sensor located?
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Main tank 1.
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How is the fuel temperature indicating system powered?
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AC electrical power.
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How is the APU fuel fed?
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When AC fuel pumps are operating, fuel for the APU is supplied from the left side
of the fuel manifold. If the AC fuel pumps are not operating, fuel is suction fed from main tank No. 1. |
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Amber FILTER BYPASS light
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Impending fuel filter bypass due to a contaminated filter.
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Center Tank FUEL PUMP LOW PRESSURE lights Illuminated amber.
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Fuel pump output pressure is low and FUEL PUMP
switch is ON. Note: With the Center (CTR) tank FUEL PUMP switches ON, continuous illumination of one LOW PRESSURE light for 10 seconds illuminates MASTER CAUTION and FUEL system annunciator lights. |
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Main Tank FUEL PUMP LOW PRESSURE lights
Illuminated amber. |
Fuel pump output pressure is low, or FUEL PUMP switch is OFF.
Note: Two LOW PRESSURE lights illuminated in same tank illuminate MASTER CAUTION and FUEL system annunciator lights. One LOW PRESSURE light causes MASTER CAUTION and FUEL system annunciator lights to illuminate on MASTER CAUTION light recall. |
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What is the electrical power source for the fuel quantity indicators?
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AC Standby bus.
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What do main tank amber fuel quantity displays indicate?
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• Fuel quantity less than 2000 lbs in related main tank
• Display remains until fuel tank quantity is increased to 2500 lbs The fuel quantity digits on tank(s) with low fuel quantity turn amber. |
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Fuel Imbalance (IMBAL) Alert displayed amber.
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• Main tanks differ by more than 1000 pounds
• Displayed below main tank with lower fuel quantity • Inhibited when aircraft is on the ground • Inhibited by fuel LOW indication when both indications exist • Displayed until imbalance is reduced to 200 pounds The fuel quantity digits on the tank with lower fuel quantity turn amber. |
