Term
| What is the tank capacity for gravity refueling? Why is it less than pressure refueling? |
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Definition
15,722#
Because the tail tank system can only be pressure refueled |
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Term
| Where are the following ejector pumps located? Main? Scavenge? Transfer? |
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Definition
Main: on top of the collector tanks
Scavenge: lowest inboard point of wing
Transfer: lowest point of center aux tank |
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Term
| What is the fuel route from the tail tank to the engine? Tanks? Pumps? |
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Definition
Tanks: tail, aux, mains, collector
Pumps: tail transfer, transfer ejector, scavenge ejector, main ejector, engine-driven pump |
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Term
| How are the tail tanks vented? |
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Definition
| Via a ram air inlet that runs down the vertical fin and out the bottom of the fuselage |
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Term
| How are the wing and aux tanks vented? |
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Definition
| Through NACA scoop vents on the trailing edge lower surace of the wing |
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Term
| What are the functions of the boost pumps? |
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Definition
| They supply fuel for engine starting and serve as backup pumps to the main ejectors |
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Term
| What is the fuel management sequence with a full fuel load? |
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Definition
Mains to 93% (4500#)
Tail to 38% (1200#)
Aux to 35% (2500#)
Tail to empty (at 1800 pph)
Aux to empty
Mains to landing |
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Term
| How are the boost pumps powered? |
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Definition
Left: DC BATT BUS
Right: DC BUS 2 |
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Term
| How do the boost pumps operate with both selected? One selected? |
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Definition
Both: both are activated if low pressure is sensed at either main ejector
One: both are activated if low pressure is sensed only on the armed side |
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Term
| Can a main ejector feed fuel to an opposite engine? |
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Definition
| No, there is a one-way check valve |
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Term
| Where does each ejector receive motive flow from? Main? Scavenge? Ejector? |
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Definition
Main: engine-driven pump
Scavenge: engine-driven pump
Transfer: main ejector pump |
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Term
| How is fuel from the collector tanks supplied to each engine-driven pump? |
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Definition
| main ejectors or electric boost pumps |
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Term
| How are the aux and tail tanks systems filled? |
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Definition
Aux: filled individually
Tail: filled simultaneously through a common manifold/sump |
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Term
| What is the purpose of the transfer ejectors? |
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Definition
| Transfer fuel from the aux to main tanks, keep the mains filled to 93% capacity |
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Term
| "L/R FUEL FILTER" caution |
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Definition
Impending bypass of fuel filter
Both? Contaminated fuel |
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Term
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Definition
Located in motive flow line
Separates ice and channels it to the main ejector pumps (larger) to prevent clotting |
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Term
| How many channels in the FSCU? How do they operate? |
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Definition
2 channels
FSCU 1 is primary, FSCU 2 operates if 1 fails |
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Term
| How many tail transfer pumps are there? How do they operate? |
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Definition
2 pumps, Primary and Secondary
If one fails, the other operates automatically |
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Term
| What is the purpose of the rotor burst shroud? |
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Definition
Protects the engine area from a fuel leak
Inhibits fuel transfer from tail tank if shroud is burst |
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Term
| How is the rotor burst pressurized? |
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Definition
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Term
| How is low rotor burst pressure incidated? |
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Definition
"AUTO/INHIB" sw/lt
"AUTO TAIL XFER INHIB" caution |
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Term
| When is the MANUAL OVRD switch selected? |
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Definition
| To stop auto tail tank fuel transfer, or to manually transfer tail tank fuel with the Tail Tank Transfer switches |
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Term
| "DUMP VALVE OPEN" caution |
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Definition
| 5 minutes after dump valve is selected open |
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Term
| At what rate do the tail transfer pumps transfer fuel to the aux tanks? |
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Definition
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Term
| Can fuel from the tail tank be transferred on the ground? |
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Definition
| Yes, with the Tail Tank Transfer MANUAL OVRD switch |
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Term
| What does the "FAIL" light on the DUMP switch indicate? |
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Definition
| Dump valve is in disagreement with switch selection |
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Term
| What is the purpose of the vanes on the dump mast? |
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Definition
| Turbular vanes - break laminar flow and keep fuel off the fuselage |
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Term
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Definition
Ground: 400# during taxi, takeoff, land
Air: 800# or 400# with flaps > 20 |
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Term
| "FUEL XFLOW SOV OPEN" caution |
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Definition
| Imbalance < 100# and 50 second time delay |
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Term
| How is gravity crossflow monitored? |
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Definition
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Term
| How is the fuel/defuel panel powered? |
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Definition
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Term
| What is the max pressure for fueling? Defueling? |
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Definition
Fueling: 50 psi
Defueling: -8 psi |
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Term
| What is the maximum fuel imbalance for structural integrity? |
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Definition
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Term
| What happens to the tail and aux SOVs if there in an interruption in pressure during fueling? |
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Definition
| They will both close if the interruption is 30 seconds or greater |
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Term
| Explain the situation if aux tank fueling is interrupted for too long. |
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Definition
| The vents open in the forward and aft tanks, equalizing the fuel in all three tanks, the sensor thinks the tanks are full, now gravity feed is the only option |
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Term
| How long does it take to read actual aux tank capacity after fueling? |
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Definition
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Term
| Where is bulk fuel temperature taken? Why? |
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Definition
left wing tank
(right wing fuel is used for APU generator adapter oil cooling) |
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Term
| Do the main boost pumps come on individually or together? |
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Definition
| Together, unless there is a power or pump failure |
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Term
| Which tanks utilize the dump mast? |
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Definition
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Term
| Can the aux and tail tanks be fueled separately? |
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Definition
| Yes, using the override switch on the fuel panel |
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Term
| What fuel system information is displayed on the EICAS and Summary Page? |
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Definition
EICAS: individual tank quantities, total fuel quantity, fuel flow
Summary: fuel temperature indications for engine and bulk |
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Term
| What do the amber dashes indicate on the fuel flow readout? |
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Definition
| Input value exceeds 5000 lb/hr, or the input is invalid |
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Term
| Can fuel be transferred from a main tank if a Scavenger pump fails? |
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Definition
| Yes, by gravity and a motive flow line |
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Term
| What is the total fuel quantity and quantity of each tank system? |
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Definition
20,000#
Mains - 9700
Aux - 7200
Tail - 3100 |
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Term
| What does the "AUTO INHIBIT" light on the Manual Override sw/lt indicate? |
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Definition
Rotor Burst Protection Cylinder nitrogen pressure is low
Automatic mode is disabled |
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Term
| How many capacitor probes are located in each tank? How does this affect fuel readings? |
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Definition
Main: 13
Aux - 2 (none in aft aux)
Tail - 1
Readings in tail and aux aren't as accurate and are slower to stabilize |
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Term
| What is the dump rate of the tail tank fuel? |
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Definition
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Term
| What indication if there for dumping fuel? How much fuel has been dumped? |
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Definition
| DUMP VALVE OPEN caution comes on after 5 minutes (500-600 lbs) |
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