Fuel

Question 1

Total fuel capacity of C605:

1) pressurized
2) gravity

Answer 1

1) 20,000 lbs

2) 15,722 lbs

Question 2

The fuel tank system has 3 sections: ___, ___, and ___ for a total of ___ tanks.

Answer 2

1) Main (L/R wings)
2) Auxiliary (forward, center, aft)
3) Tail (tail cone, L/R saddle)
8 total tanks

Question 3

The main (L/R wing) tanks can hold ___ lbs (___ gal) fuel each for a total of ____ lbs (___ gal).

Answer 3

4874 lbs (722 gal) each

total 9748 lbs (1444 gal)

Question 4

The Auxiliary tanks can hold ___ lbs (___ gal)

Answer 4

7172 lbs (1062 gal)

Question 5

The tail tanks can hold ___ lbs (___ gal)

Answer 5

3147 lbs (467 gal)

Question 6

The maximum pressure for refueling is ___psi

Answer 6

50 psi

Question 7

The ___ tank system can NOT be refueled by gravity

Answer 7

tail

Question 8

Do NOT open overwing fuel caps unless wing tanks < ___% full (___ lbs)

Answer 8

93% (4500lbs)

Question 9

The maximum structural imbalance between wing tanks during gravity refueling is ___ lbs

Answer 9

2500lbs

Question 10

The L/R main tanks feed the ___ tanks located in the ___ tank via ___ or ___ pumps

Answer 10

collector tanks located in the center aux tank

gravity or scavenge ejector pumps

Question 11

The APU is fed from the ___ fuel tank

Answer 11

R main tank

Question 12

___ prevent fuel from surging toward the wing tips

Answer 12

flapper valves

Question 13

The auxiliary tank is composed of ___ interconnected tanks. The ___ and ___ tanks gravity feed the ___ tank via ___ .

Answer 13

3 - forward, aft and center

aft and forward tanks gravity feed the center via primary and secondary transfer lines

Question 14

The aux tanks feed the ___ tank via ___ pump when the ___ tank is < ___% full (___lbs)

Answer 14

wings tanks
transfer ejector pump
wing tank; 93% full (4600lbs)

Question 15

The tail fuel tank system is composed of __(3)__ tanks that are ___ (separate or connected) and are located ___.

Answer 15

tail cone, L/R saddle tanks

separate (share a common sump manifold)
located: tail cone - tail; saddle tanks in aft equipment bay

Question 16

The tail tank system supplies fuel to the ___ tanks by ____ pumps when the fuel system control unit (FSCU) senses < ___ lbs

Answer 16

Aux tanks by electric tail transfer pumps

7000 lbs

Question 17

Can the crew manually control the scheduled tail tank transfer? If so, how?

Answer 17

the OVRD switch light

Question 18

Fuel quantity is measured by ___ (#) DC-type probes and is corrected for aircraft’s attitude with information from ___

Answer 18

17 probes

IRS 1 and 2

Question 19

How are the fuel tanks vented?

Answer 19

Wing and aux tanks - NACA scoops

Tail tanks share common vent line running down vertical fin and out the bottom of the fuselage

Question 20

___ provides positive pressure to fuel tanks during flight

Answer 20

Ram air

Question 21

There are ___ (#) manual vent valves:

If opened or popped indicating overpressure ___

Answer 21

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

Question 22

There are ___ (#) ___-powered boost pumps.

The left boost pump is powered by the ___ bus;
The right boost pump is powered by the ___ bus

Answer 22

2; DC

L - DC BATT bus
R - DC Bus 2

Question 23

The boost pumps are used for ___ and ___

Answer 23

engine start

backup fuel feed (low fuel pressure) - must be armed

Question 24

The Main Ejector pumps are located ___, receive pressurized fuel from ___ and provide fuel to ___ and ___

Answer 24

on top of its collector tank

engine (FCU)

respective engine AND
motive flow supply to on-side transfer ejector pump

Question 25

Can the main ejector fuel pumps feed the cross-side engine? How or why not?

Answer 25

No; one-way check valve (tested during first flight of the day?)

Question 26

The scavenge ejector pumps are located ____, receive pressurized fuel from ___ and transfer fuel from ___ to ___ tanks.

Answer 26

lowest inboard point in each main (wing) tank engine (FCU) main (wing) tank to collector tank

Question 27

The Transfer Ejector Pumps are located ___, receives motive flow from ___ and continuously transfers fuel to the ___ tanks, maintaining them at ___%.

Answer 27

lowest point of the center aux tank on-side ejector pump main tanks; 93%

Question 28

The engine fuel shutoff valves are powered by the ___ bus and activated closed when you push the ___

Answer 28

DC EMER BUS | push the ENG FIRE PUSH switch

Question 29

A wash filter is installed along the motive flow feed lines from engine to main and scavenge ejector pumps. Its purpose it to ___

Answer 29

separate ice crystals and channel them to the larger main ejector pump protecting the smaller scavenge pump.

Question 30

The Fuel System Computer Unit (FSCU) is located in the ___. It has 2 channels with Channel 1 is ___ and Channel 2 is ___.

Answer 30

underfloor avionic/electronic bay Ch 1 - primary; Ch 2 - standby with auto replace

Question 31

The FSCU is powered by ____ (4 buses)

Answer 31

DC ESS, DC BATT, APU BATT DIR and DC BUS 1

Question 32

The functions of the FSCU are: (3)

Answer 32

1) fuel quantity gauging 2) tail tank to aux tank auto fuel transfer 3) auto refueling shutoff

Question 33

Can fuel from the tail tank be transferred to the aux tank on the ground? If so, how? If not, why?

Answer 33

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

Question 34

There are ___ (#) tail tank transfer pumps located in the ___. They transfer fuel to the ___ tank at ___ lbs/hr

Answer 34

2; sump of the tail tank system aux tank; 1800 lbs/hr

Question 35

The ____ is pressurized with nitrogen, monitored by the FSCU and, when punctured, inhibits tail to aux tank fuel transfer

Answer 35

Rotor Burst Protection shroud

Question 36

The Rotor burst protection shroud's purpose is to ___. It is pressurized with ___ and monitored by the ___.

Answer 36

inhibit tail to aux fuel transfer nitrogen; FSCU

Question 37

In order to dump fuel the flaps must be at ___ and the dump switch must have power (___ bus)

Answer 37

0 deg; DC BATT bus

Question 38

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.

Answer 38

100-120 lbs/min 30 min 5 min; DUMP VALVE OPEN

Question 39

Max fuel imbalance on the ground is ___ lbs Max fuel imbalance in the air is ___ lbs

Answer 39

400 lbs 800 lbs

Question 40

When will you get a FUEL IMBALANCE message inflight with < 800lbs split?

Answer 40

with fuel imbalance > 400 lbs and flaps at 20 deg or greater

Question 41

There are ___ (#) DC-powered crossflow valves located in the ___ tank: __, ___, and ___.

Answer 41

3; aux tank: L/R aux flow and gravity flow

Question 42

___ prevents both L and R to AUX valves open at the same time

Answer 42

INTERLOCK

Question 43

FUEL XFLOW SOV OPEN message will appear after ___ delay and the fuel imbalance is < ___ lbs

Answer 43

50 sec delay; < 100lbs

Question 44

The L/R AUX crossflow valves move ___ tank fuel to the ___ tank. The gravity crossflow valve moves ___ tank fuel to ___ tank

Answer 44

one wing tank fuel to the aux tank wing tank fuel to wing tank

Question 45

Both refueling panels are powered by the ___ bus

Answer 45

APU BATT DIR bus (APU Battery must be connected)

Question 46

The ___ refueling panel has priority over the ___ refueling panel. The ___ refueling panel has a kill switch while the other does not.

Answer 46

cockpit ; external external

Question 47

Start refueling at ___ psi for approximately ___ sec then increase truck pressure to ___ psi to avoid venting fuel

Answer 47

35 psi; 15-20 sec; 50 psi

Question 48

Can the aux tank be fueled by itself?

Answer 48

No; must be selected with Tail tank (FSCU prevents)

Question 49

What happens if the fuel pressure is interrupted to the AUX tank for > 30 sec? Can this be overrided?

Answer 49

FSCU closes TAIL and AUX SOVs | Can be overrided by holding the OVERRIDE button OR cycle power switch on refueling panel OFF then FUEL

Question 50

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

Answer 50

forward and center AUX tank 1 to 8 min

Question 51

What does the OVERRIDE button on the refueling panel do?

Answer 51

allows individual fueling/defueling of the aux and tail tanks provided the high level sensor has not been triggered in the selected tank

Question 52

Bulk fuel temperature probe is located in the ___ tank. Bulk fuel temp readout turns amber at < ___ deg C

Answer 52

L wing tank -37 deg C

Question 53

Fuel from the ___ tank cools the APU generator controller

Answer 53

R wing tank

Question 54

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

Answer 54

after the fuel/oil heat exchanger 5 deg C

Question 55

Main tank fuel quantity readout turns amber < ___ lbs Total fuel quantity readout turns amber < ___ lbs

Answer 55

500 lbs 500 lbs

Question 56

T/F: the collector tank fuel is not part of fuel quantity

Answer 56

true

Question 57

APU fuel is drawn from the ___ tank

Answer 57

Right wing

Question 58

Fuel flow indications turn amber and display dashed line if ____ or ___

Answer 58

> 5000 pph OR | input value is invalid