Term
What provides venting for the fuel tanks? |
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Definition
NACA vent scoops under the wings |
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Term
Where are the two collector tanks located? |
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Definition
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Term
| How is fuel prevented from flowing to the wing tip during wing |
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Definition
| One way flow valves in each wing tank. |
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Term
| During climb you notice the total fuel in the center tank increase by 300 lbs, is this a problem? |
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Definition
No
possible for fuel to flow to the center tank from the vent system during climb and cause the fuel quantity readings of the center tank to increase as high as 300 lbs. |
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Term
| Where is the temperature of the fuel measured? |
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Definition
Left Wing Tank - >-40C
Fuel Line to each engine - >5C |
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Term
| What powers the fuel ejectors? |
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Definition
| motive flow form the high pressure pump. |
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Term
| How is fuel transferred from the wing tanks to the collector tanks? |
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Definition
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Term
| How are the boost pumps powered? |
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Definition
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Term
| What is the purpose of the boost pumps? |
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Definition
Transfer fuel form the collector tanks to the engines.
Back up to main ejectors when the ejector fails.
Provide fuel pressure during engine start. (not required for engine start) |
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Term
| When will the electric boost pumps operate with the L and R boost pump switch light selected? |
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Definition
| BOTH pumps will operate when the fuel computer detects low fuel feed pressure in either feed manifold. |
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Term
| Which electric boost pump will operate with just DC power? |
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Definition
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Term
| Explain the APU/XFLOW PUMP |
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Definition
| DC powered pump used to supply fuel to the APU from both wing tanks equally and performs crossflow operations. |
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Term
| APU negative gravity relief valve opens when: |
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Definition
if the APU/XFLOW fuel pump fails.
negative gravity condition exists in flight. |
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Term
| Two methods to cross flow fuel? |
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Definition
Powered (auto or man)
Gravity |
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Term
| Operation of the automatic XFLOW. |
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Definition
Fuel imbalance of more that 200lbs.
APU/XFLOW pump is powered and fuel is taken from both wing tanks. the crossflow valve on the low quantity side will open and fill the low side to 50lbs above the other side. |
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Term
| When will the FUEL IMBALANCE caution message appear on the EICAS? |
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Definition
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Term
| When will the fuel total turn AMBER? |
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Definition
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Term
| When will the bulk fuel temperature in the left wing turn amber? |
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Definition
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Term
| When will the L/R fuel feed temperatures turn amber? |
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Definition
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