Fuel Flashcards
Total fuel capacity of C605:
1) pressurized
2) gravity
1) 20,000 lbs
2) 15,722 lbs
The fuel tank system has 3 sections: ___, ___, and ___ for a total of ___ tanks.
1) Main (L/R wings)
2) Auxiliary (forward, center, aft)
3) Tail (tail cone, L/R saddle)
8 total tanks
The main (L/R wing) tanks can hold ___ lbs (___ gal) fuel each for a total of ____ lbs (___ gal).
4874 lbs (722 gal) each
total 9748 lbs (1444 gal)
The Auxiliary tanks can hold ___ lbs (___ gal)
7172 lbs (1062 gal)
The tail tanks can hold ___ lbs (___ gal)
3147 lbs (467 gal)
The maximum pressure for refueling is ___psi
50 psi
The ___ tank system can NOT be refueled by gravity
tail
Do NOT open overwing fuel caps unless wing tanks < ___% full (___ lbs)
93% (4500lbs)
The maximum structural imbalance between wing tanks during gravity refueling is ___ lbs
2500lbs
The L/R main tanks feed the ___ tanks located in the ___ tank via ___ or ___ pumps
collector tanks located in the center aux tank
gravity or scavenge ejector pumps
The APU is fed from the ___ fuel tank
R main tank
___ prevent fuel from surging toward the wing tips
flapper valves
The auxiliary tank is composed of ___ interconnected tanks. The ___ and ___ tanks gravity feed the ___ tank via ___ .
3 - forward, aft and center
aft and forward tanks gravity feed the center via primary and secondary transfer lines
The aux tanks feed the ___ tank via ___ pump when the ___ tank is < ___% full (___lbs)
wings tanks
transfer ejector pump
wing tank; 93% full (4600lbs)
The tail fuel tank system is composed of __(3)__ tanks that are ___ (separate or connected) and are located ___.
tail cone, L/R saddle tanks
separate (share a common sump manifold)
located: tail cone - tail; saddle tanks in aft equipment bay
The tail tank system supplies fuel to the ___ tanks by ____ pumps when the fuel system control unit (FSCU) senses < ___ lbs
Aux tanks by electric tail transfer pumps
7000 lbs
Can the crew manually control the scheduled tail tank transfer? If so, how?
the OVRD switch light
Fuel quantity is measured by ___ (#) DC-type probes and is corrected for aircraft’s attitude with information from ___
17 probes
IRS 1 and 2
How are the fuel tanks vented?
Wing and aux tanks - NACA scoops
Tail tanks share common vent line running down vertical fin and out the bottom of the fuselage
___ provides positive pressure to fuel tanks during flight
Ram air
There are ___ (#) manual vent valves:
If opened or popped indicating overpressure ___
1 each wing tip
1 beneath the center aux tank
1 left side of vertical fin for tail tanks
It must be reset before flight
There are ___ (#) ___-powered boost pumps.
The left boost pump is powered by the ___ bus;
The right boost pump is powered by the ___ bus
2; DC
L - DC BATT bus
R - DC Bus 2
The boost pumps are used for ___ and ___
engine start
backup fuel feed (low fuel pressure) - must be armed
The Main Ejector pumps are located ___, receive pressurized fuel from ___ and provide fuel to ___ and ___
on top of its collector tank
engine (FCU)
respective engine AND
motive flow supply to on-side transfer ejector pump
Can the main ejector fuel pumps feed the cross-side engine? How or why not?
No; one-way check valve (tested during first flight of the day?)
The scavenge ejector pumps are located ____, receive pressurized fuel from ___ and transfer fuel from ___ to ___ tanks.
lowest inboard point in each main (wing) tank
engine (FCU)
main (wing) tank to collector tank
The Transfer Ejector Pumps are located ___, receives motive flow from ___ and continuously transfers fuel to the ___ tanks, maintaining them at ___%.
lowest point of the center aux tank
on-side ejector pump
main tanks; 93%
The engine fuel shutoff valves are powered by the ___ bus and activated closed when you push the ___
DC EMER BUS
push the ENG FIRE PUSH switch
A wash filter is installed along the motive flow feed lines from engine to main and scavenge ejector pumps. Its purpose it to ___
separate ice crystals and channel them to the larger main ejector pump protecting the smaller scavenge pump.
The Fuel System Computer Unit (FSCU) is located in the ___. It has 2 channels with Channel 1 is ___ and Channel 2 is ___.
underfloor avionic/electronic bay
Ch 1 - primary; Ch 2 - standby with auto replace
The FSCU is powered by ____ (4 buses)
DC ESS, DC BATT, APU BATT DIR and DC BUS 1
The functions of the FSCU are: (3)
1) fuel quantity gauging
2) tail tank to aux tank auto fuel transfer
3) auto refueling shutoff
Can fuel from the tail tank be transferred to the aux tank on the ground? If so, how? If not, why?
Not automatically via the FSCU but you can select manual override using the MANUAL OVRD switch light and selecting the PRI or SEC pumps
NOTE: pumps do NOT aut shutoff when tail tank is empty
There are ___ (#) tail tank transfer pumps located in the ___. They transfer fuel to the ___ tank at ___ lbs/hr
2; sump of the tail tank system
aux tank; 1800 lbs/hr
The ____ is pressurized with nitrogen, monitored by the FSCU and, when punctured, inhibits tail to aux tank fuel transfer
Rotor Burst Protection shroud
The Rotor burst protection shroud’s purpose is to ___. It is pressurized with ___ and monitored by the ___.
inhibit tail to aux fuel transfer
nitrogen; FSCU
In order to dump fuel the flaps must be at ___ and the dump switch must have power (___ bus)
0 deg; DC BATT bus
Fuel can be dumped at a rate of ___ lbs/min. It takes approximately ___ to empty a full tail tank. After ___ min of fuel dumping the ___ caution message appears.
100-120 lbs/min
30 min
5 min; DUMP VALVE OPEN
Max fuel imbalance on the ground is ___ lbs
Max fuel imbalance in the air is ___ lbs
400 lbs
800 lbs
When will you get a FUEL IMBALANCE message inflight with < 800lbs split?
with fuel imbalance > 400 lbs and flaps at 20 deg or greater
There are ___ (#) DC-powered crossflow valves located in the ___ tank: __, ___, and ___.
3; aux tank: L/R aux flow and gravity flow
___ prevents both L and R to AUX valves open at the same time
INTERLOCK
FUEL XFLOW SOV OPEN message will appear after ___ delay and the fuel imbalance is < ___ lbs
50 sec delay; < 100lbs
The L/R AUX crossflow valves move ___ tank fuel to the ___ tank.
The gravity crossflow valve moves ___ tank fuel to ___ tank
one wing tank fuel to the aux tank
wing tank fuel to wing tank
Both refueling panels are powered by the ___ bus
APU BATT DIR bus (APU Battery must be connected)
The ___ refueling panel has priority over the ___ refueling panel.
The ___ refueling panel has a kill switch while the other does not.
cockpit ; external
external
Start refueling at ___ psi for approximately ___ sec then increase truck pressure to ___ psi to avoid venting fuel
35 psi;
15-20 sec;
50 psi
Can the aux tank be fueled by itself?
No; must be selected with Tail tank (FSCU prevents)
What happens if the fuel pressure is interrupted to the AUX tank for > 30 sec?
Can this be overrided?
FSCU closes TAIL and AUX SOVs
Can be overrided by holding the OVERRIDE button OR cycle power switch on refueling panel OFF then FUEL
Aux tank fuel quantity indications are generated using probes in the ___ and ___ tanks
Aux tank quantity only accurate ___ to ___ minutes after refueling stops and the tanks have equalized
forward and center AUX tank
1 to 8 min
What does the OVERRIDE button on the refueling panel do?
allows individual fueling/defueling of the aux and tail tanks
provided the high level sensor has not been triggered in the selected tank
Bulk fuel temperature probe is located in the ___ tank.
Bulk fuel temp readout turns amber at < ___ deg C
L wing tank
-37 deg C
Fuel from the ___ tank cools the APU generator controller
R wing tank
The engine fuel temperature probe is located after the ___.
The engine fuel temp readout turns amber < ___ deg C
NOTE: If get FUEL TEMP LO you might get FUEL FILTER caution as well
after the fuel/oil heat exchanger
5 deg C
Main tank fuel quantity readout turns amber < ___ lbs
Total fuel quantity readout turns amber < ___ lbs
500 lbs
500 lbs
T/F: the collector tank fuel is not part of fuel quantity
true
APU fuel is drawn from the ___ tank
Right wing
Fuel flow indications turn amber and display dashed line if ____ or ___
> 5000 pph OR
input value is invalid
