Term
| How many fuel tanks are there? |
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Definition
2 main tank systems, one in each wing.
2 auxiliary tanks, one behind each engine nacelle |
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Term
| What is the fuel capacity? |
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Definition
25 gallons for each main tank X 2 = 50 gallons
13 gallons for each aux tank X 2 = 26 gallons
Maximum 76 gallons |
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Term
| How many fuel pumps are there? |
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Definition
6 total
1 low pressure engine-driven pump per side supplies fuel to each engine
1 high pressure engine-driven fuel pump supplies pressure to the common rail for each engine
1 aux pump per side to transfer fuel from the aux fuel tank to the main fuel tank. |
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Term
| Describe the design of the main fuel tanks. |
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Definition
Three aluminum chambers connected by large rubber hoses.
Fuel level probes are positioned in the outer and inner chambers.
Inner chamber has fuel return input, low fuel sensor, and fuel temperature sensor
Outer chamber has a fuel level shutoff switch to stop aux transfer pump when the tank is full. |
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Term
| How much fuel remains when a L/R LOW FUEL caution is displayed? |
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Definition
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Term
| What are the positions for the fuel selector and what do they mean? |
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Definition
On, Crossfeed, off.
When On, the engine is receiving fuel from the main tank on the same side as the engine.
When set to Crossfeed, the engine is receiving fuel from the main tank on the opposite side.
When set to Off, the engine is not receiving any fuel. |
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Term
| How much fuel is supplied to the engine and how much is actually burned? |
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Definition
Approximately 20 gallons per hour are fed to the high pressure pump.
Approximately 7 gallon per hour are actually consumed. |
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Term
| What happens to the excess fuel that is not consumed? |
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Definition
| Approximately 13 gallons per hour are routed through a fuel cooler and then returned to the main tank (inboard segment). |
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Term
| Why is a fuel cooler required? |
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Definition
| The fuel heats up when compressed by the high pressure pump (approximately 1800 PSI). |
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Term
| Describe the fuel flow when the right fuel selector is set to ON. |
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Definition
| The right engine's low-pressure engine driven fuel pump draws fuel from the right main tank through a fuel filter, then feeds the fuel to the high-pressure pump. Excess (unburned ) fuel from the common rail is routed through the fuel cooler and then back into the right main tank. |
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Term
| Describe the fuel flow when the right fuel selector is set to cross feed. |
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Definition
| The right engine's low-pressure engine driven fuel pump draws fuel from the left main tank through the left tank's fuel filter, then feeds the fuel to the high-pressure pump. Excess (unburned ) fuel from the common rail is routed through the left side fuel cooler and then back into the left main tank. |
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Term
| How can the aux fuel be consumed? |
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Definition
| Fuel from the aux tanks can only be transferred to the main tank on the same side using the aux transfer pumps. |
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Term
| What happens if the aux transfer pumps are turned on, but the main tanks are already full? |
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Definition
| A shutoff sensor in the outboard segment of the main tanks deactivates the aux transfer pump until there is sufficient room in the main tank for the transfer to occur. |
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Term
| What does the L/R AUX FUEL E message mean? |
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Definition
| The aux tank is empty and the aux transfer pump has been shut off automatically. You should turn off the aux transfer pump switch when you see this message. |
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Term
| How fast is fuel transferred from the aux tanks to the main tanks. |
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Definition
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Term
| Is fuel in the aux tank heated? |
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Definition
| No. Fuel is returned only to the main tanks, no the aux tanks. |
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Term
| What kind of fuel can you use in the aux tanks? |
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Definition
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Term
| What is the maximum fuel imbalance for the main tanks? |
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Definition
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Term
| How could you correct a fuel imbalance? |
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Definition
| Set the fuel selector for the engine with less fuel in its main tank to x-feed to drawn fuel from the fullest tank until the fuel is balanced. |
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Term
| Are there fuel gauges for the aux tanks? |
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Definition
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Term
| Can you use JET-A with the additive PRIST? |
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Definition
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