FUEL SYSTEM Flashcards
- What does ENG VALVE CLOSED mean when bright blue?
In transit or disagreement
- What does ENG VALVE CLOSED mean when dim blue?
Valve closed
- What does SPAR VALVE CLOSED mean when bright blue?
In transit or disagreement
- What does SPAR VALVE CLOSED mean when dim blue?
Valve closed
- What is the position of the engine valve or spar valve if the lights are extinguished?
Open
- Which valve is controlled by the start lever,
engine valve or spar valve?
Both, Spar valve and engine valve
- Which one of these valves is controlled by the
engine fire switch?
Both
- Which one of these valves is controlled by the
respective EEC?
Engine valve
- What is the maximum fuel temperature?
49C
- What is the minimum fuel temperature?
-43C or fuel freeze +3C (whichever is higher)
- What is indicated by a FILTER BYPASS light?
Impending filter bypass (contaminated fuel)
- Could the Filter Bypass light be ice? Why not?
Not likely. Fuel is warmed prior to entering filter
- If a fuel valve is in transit, is it bright or dim?
Bright
- Is the fuel crossfeed from tank to tank or tank to engine?
Tank to engine
- How many valves are controlled with the
crossfeed switch?
One
- What electrical power is needed to operate the
crossfeed valve?
Battery bus
- Are the Center Tank FUEL LOW PRESS lights
always armed to indicate low pressure?
No, only in ON position
- What does the Center Tank FUEL LOW PRESS
lights mean?
Pumps are on with output either LOW or NO pressure
- If only one Center Tank LOW PRESS light is on, will the Master Caution light illuminate?
Yes, it only takes one LOW PRESS light to give you the MC lights and FUEL ANNUNCIATOR on the center tanks
- With one Center Tank pump OFF, will illumination of the opposite low press light illuminate the MC light?
Yes
- What is the electrical power source for the center tank pumps?
AC Power
- What is the electrical power source for the
main tank fuel pumps?
AC Power
- What does illumination of a AFT/FWD fuel
LOW PRESS light mean?
Low output press or switch is off
- What sort of indication would you get with the
illumination of just one LOW PRESS light in the center tank?
Master caution and fuel annunciator on recall
- What indication would you get with illumination of both LOW PRESS lights in the same tank?
Master caution and fuel annunciator lights
- How many fuel sticks are there in a Main
Tank?
six
- How many fuel sticks are there in the Center
Tank?
four
- Which fuel is used first, Center Tank or Main
Tank?
Center tank fuel
- Do Center Tank pumps produce the same
pressure as Main Tank pumps?
No, higher output
- Engines have mechanical fuel pumps. Can
they suck fuel?
Yes
- Can fuel be suctioned from the Main Tanks?
Why?
Yes. They have a bypass valve
- What does CONFIG indicate on the Center
Tank gage?
Center tank quantity >1600lbs with lowor no pump pressure and engine is running
- Can fuel be suctioned from the Center Tank?
Why?
No. No bypass valve
- The Center Tank has a fuel scavenge jet
pump. What does it do?
Transfers remaining center tank fuel to #1 main tank when #1 main tank is approximately half full and #1 fwd boost pump is running
- Where is the fuel temperature sensor located?
#1 main tank
- Which tank can supply the APU?
Any tank with the appropriate pump on
and crossfeed position
- Which tank can the APU suction feed from?
#1 main tank
- What is the total capacity of the fuel system?
46,000lbs
- How much fuel can the Center Tank hold?
28,800lbs
- What does LOW indicate on the main tank
gages?
Fuel quantity less than 2.000lbs
- Can you get a LOW indication on the Center
Tank gage?
no
- What does IMBAL indicate on the Main Tank
gage?
Mains differ by more than 1000lb
