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650 > Week 2 Day 3 > Flashcards

Week 2 Day 3 Flashcards

1
Q

How many dual gauging probes are there in the fuel tank?

A
  • 2 total

- outboard hopper both tanks

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2
Q

How many gauging probes are there in the fuel tanks?

A
  • 28 total

- 14 per tank

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3
Q

How many fuel characteristic sensors are there?

A
  • 2

- bay 1 left and right (in front of hoppers)

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4
Q

How many temperature sensors are there in the fuel system?

A
  • 2

- bay 4 both tanks

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5
Q

How many high level sensors are there in the fuel tanks?

A
  • 2

- bay 6 each tank

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6
Q

How many remote data concentrators are there in the fuel system?

A

4 total

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7
Q

How many fuel quantity signal conditioners are there?

A
  • 1
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8
Q

How many positive/negative pressure relief valves are there in the fuel tanks?

A
  • One per tank

- Actuate at 6.5 psi differential

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9
Q

How do you balance fuel loads on the ground?

A

Using the cross flow valve

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10
Q

Where is the FQSC?

A
  • LEER

- Behind CB panel

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11
Q

What are the functions of the FQSC? (3)

A
  • calculates fuel quantity
  • performs fault detection
  • sends information to MAU’s for display
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12
Q

How many HFRTT system valves are there?

A
  • 4 total (2 per system)
  • one RR valve (part of FMU)
  • one Gulfstream valve in pylon
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13
Q

How are the main fuel shut off valves shut off in an emergency?

A

Fire handles

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14
Q

What controls the APU fuel shut off valve?

A

APU master switch

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15
Q

At what hopper fuel quantity will you get a fuel level low CAS message? What probe senses this low level?

A
  • 650 lbs

- dual gauging probe

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16
Q

What is the capacity of each hopper?

A

1333 lbs

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17
Q

What is the total fuel quantity for each tank?

A
  • 22100 for 650

- 24100 for ER

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18
Q

What type of cables run from the remote data concentrators to the FQSC?

A

Fibre optic

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19
Q

Of the 14 probes per tank, how many report to each data concentrator? What about DGP?

A
  • 7

- DGP reports to both

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20
Q

What position is the HFRTT switch normally in?

A

AUTO

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21
Q

In AUTO, what controls the position of the HFRTT valves?

A

Inside engine EEC

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22
Q

Which switch bypasses the FQSC and closes the fuelling shut off valves?

A

Remote fuelling shut off switch

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23
Q

When using the cross flow valve, what physically moves the fuel?

A

Boost pumps

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24
Q

When moving fuel using the inter tank valve, what physically moves the fuel?

A

Gravity

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25
Q

When does a blue cross flow valve open CAS message turn amber?

A

After 5 mins

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26
Q

Inter tank and cross flow valves have closed position switches. As soon as not fully closed, system thinks they’re fully open. How long should they take to fully close, after selecting off, if operating correctly?

A

2-3 seconds

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27
Q

What is the maximum imbalance of fuel permitted by the FQSC during refuel? What does it do to control this?

A
  • 1000 lbs

- opens and closes respective fuelling shut off valves

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28
Q

How many wet bays per fuel tank?

A

7

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29
Q

Where is the plenum located?

A

Outboard end of fuel tank

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30
Q

What separates the fuel tank bays?

A

Baffle ribs

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31
Q

What in the baffle ribs allows fuel to travel inboard to the hopper?

A

Flapper valves

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32
Q

What are the openings at the top of the baffle ribs for?

A

To allow fuel to escape outboard during refuel

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33
Q

Where do the fuel probes get their excitation voltages? Where do they report to?

A

their dedicated RDC’s

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34
Q

How many boost pumps are required for dispatch?

A

3

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35
Q

How much fuel is required to prime a single boost pump?

A
  • 10000lbs total

- 5000lbs per tank

36
Q

How many compartments in the hopper?

A

2

37
Q

Where is the overwing fuel cap? What does this mean?

A
  • Top of bay 3

- can’t max fuel from overwing

38
Q

How many removable tank access panels are there? Can they be swapped position?

A
  • 24

- can only swap positions of tank panels in the same group

39
Q

Are there any towing or jacking restrictions with tank panels removed?

A

No

40
Q

What safety mechanism is built in to the overwing refuel cap adapter?

A

FOD screen

41
Q

What is the purpose of the hopper?

A

Ensures fuel always available to the boost pumps

42
Q

What do the ejector pumps do?

A

Pull fuel from bay 1 in to hopper when fuel pumps are on

43
Q

How many low point drains are there?

A
  • 6 total
  • 3 per wing
  • 2 inbd and 1 in plenum
44
Q

How many vent stringers are there? Where do they run?

A
  • 2 per tank

- inboard to plenum

45
Q

How many vent float valves are there?

A
  • 4 total
  • 2 per tank
  • open and close to allow air in and out of tank
46
Q

What pressure does the tank pressure relief valve operate?

A

6.5psi differential

47
Q

What is the purpose of the vent plenum? (3)

A
  • lets air and fuel vapour flow in and out of tank
  • collects fuel from vent stringers
  • provides 2% fuel expansion space for fuel in tanks
48
Q

If the plenum is full, where does fuel go?

A

Overboard

49
Q

What does the flame arrestor do?

A

Stops propagation of flame from outside of tank to in

50
Q

During normal operation, what happens to the fuel in the plenum?

A

Sucked back in to tanks by engine suction

51
Q

What is the purpose of HFRTT?

A

Stop icing/gelling of fuel

52
Q

At what temperature does fuel gel?

A

Approx -55 degrees C

53
Q

At what tank temperature does HFRTT operation start?

A

0 degrees C

54
Q

At what tank temperature does HFRTT stop?

A

10 degrees C

55
Q

Which bays does heated fuel get sprayed into?

A

First 4 of each tank

56
Q

Selecting heated fuel return switch to off closes which valve?

A

FRTT (pylon)

57
Q

What does having the HFRTT button in AUTO do?

A

Primes the EEC

58
Q

FRTT valves are powered by which power source?

A

Main DC

59
Q

What is another way of closing the FRTT valve for in an emergency?

A

Fire handle

60
Q

During a refuel, which bay is fuel deposited?

A

Bay 1

61
Q

Where does defuel suck fuel from?

A

The hopper

62
Q

What type of bus does the FQSC communicate with the SMC’s on?

A

Arinc 429

63
Q

What type of bus does the FQSC communicate with the GSCP on?

A

Wires CAN bus

64
Q

Information from the probes to the RDC’s is in which format?

A

Analog

65
Q

What information do the IRS’s provide to the FQSC for refuelling?

A

Aircraft attitude

66
Q

If the IRS’ can’t be used for aircraft attitude during refuel, what backup is there?

A

Tilt sensors on the FCS

67
Q

Refuel valves are __________ open and ______ loaded closed

A
  • energised

- spring

68
Q

Maximum defuelling rate is what?

A

50 gallons per minute

69
Q

What is maximum refuelling pressure?

A

55psi

70
Q

The fuel drain valve is used for what and accessed from where?

A
  • power defuelling of aircraft

- accesses through aft WTBF

71
Q

Fuelling can be accomplished from where?

A

GSCP or SMC

72
Q

Refuelling master switch on initiates what at the GSCP?

A

BITE

73
Q

How long should it take for the total fuel level be accurate on the GSCP? What do you do if it isn’t?

A
  • 2 mins

- reboot master

74
Q

What changed the max fuel load on the G650 to the G650ER?

A

Software

75
Q

What is on the overhead panel to terminate refuelling?

A

Remote fuelling shut off switch

76
Q

Prior to refuelling, what do you need to ensure aren’t blocked? These also need to be checked for positive air pressure during refuel

A

NACA scoops

77
Q

What does a red LED at the ground service control panel indicate?

A
  • Failure of pressure refuelling shut off valves

- terminate fuelling immediately

78
Q

If there is a >250lb split during refuel, what does the FQSC open and close accordingly to match levels?

A

Refuelling shut off valves

79
Q

When does the FQSC perform a test of the high level sensors?

A

Start of refuel

80
Q

What is unique about the cross flow and inter tank valve actuators?

A
  • identical

- can be transposed for troubleshooting

81
Q

What side is the inter tank valve?

A

Right hopper

82
Q

What side is the cross flow valve?

A

Left hopper

83
Q

When do you get a fuel imbalance CAS message?

A

> 1000lb imbalance

84
Q

Boost pumps sit inside what?

A
  • canisters

- can be replaced without defuelling

85
Q

Double walled fuel lines are inspected for leaks where?

A

Witness drains

86
Q

Where is the APU fuel line witness drain?

A

Water service panel

650 (9 decks)

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