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SYSTEMS > Fuel & IPAS > Flashcards

Fuel & IPAS Flashcards

1
Q

What does the Fuel System do?

A

Provides fuel and fuel management provisions to operate both engines and the APU

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2
Q

What is the capacity (gallons/pounds) of the forward fuel cell?

A

156 gallons

1045 pounds

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3
Q

What is the capacity (gallons/pounds) of the aft fuel cell?

A

220 gallons

1474 pounds

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4
Q

What is the capacity (gallons/pounds) of the Internal Auxiliary Fuel Cell (Robby Tank)?

A

100 gallons

670 pounds

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5
Q

The fuel cells and fuel lines are self-sealing against up to what caliber projectile?
Within the 30 minute reserve?

A
  1. 5-mm projectile

14. 5-mm projectile (30 min reserve)

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6
Q

Fuel Cell Internal Components

What is the purpose of the Breakaway Valve?

A

Reduce fire hazards by sealing fuel cells and lines in the event of a high-impact landing.

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7
Q

Fuel Cell Internal Components
How does the fuel cell equalize pressure within the fuel cells; vent contents due to thermal expansion, and/or prevent fuel leakage in the event the helicopter rolls over?

A

Air Vent / Pressure Release Valve

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8
Q

Fuel Cell Internal Components

If not using pressurized fuel, how can the fuel cells be filled?

A

Gravity Filler Port

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9
Q

Fuel Cell Internal Components

What is the purpose of the Fuel Level Control Valve Assembly?

A

Automatically shut off fuel flow into the FWD/AFT cell when full

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10
Q

Fuel Cell Internal Components
How many Fuel Quantity Transmitters are there?
Where is the quantity signal sent to?

A

Three. Two FWD (due to shape); One AFT

Signal sent to the SP

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11
Q

Fuel Cell Internal Components

What is the purpose of the Four-Way Check Valve?

A
  • Permits fuel to bypass boost pump when it is off
  • Allows fuel to flow to boost pump when it is on
  • Prevents draining of the fuel lines after APU and/or ENG shutdown
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12
Q

Fuel Cell Internal Components
What component relieves excessive pressure buildup in the fuel lines due to thermal expansion and prevents draining of the fuel lines after engine shutdown?

A

Check / Thermal Relief Valve

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13
Q

Fuel Cell Internal Components

What is the purpose of the Sump Drain Assembly?

A

Allows access to obtain fuel samples

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14
Q

How often are fuel samples required?

A

Before the first flight of the day

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15
Q

What is the maximum airspeed with symmetrically loaded (two or four) external fuel tanks?

A

130 KTAS

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16
Q

What is the maximum G load factor with symmetrically loaded (two or four) external fuel tanks?

A

2 G’s

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17
Q

What is the purpose of the Nitrogen Inerting System (NIS)?

A

Reduces fire hazards by filling the ullage with oxygen-depleted air that will not support combustion.

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18
Q

Where does the NIU receive air from?

A

IPAS Pressurized Air

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19
Q

What is the indication that the NIU has failed?

A

NIU Monitor Panel - Black and Three White Triangles

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20
Q

What is the purpose of the Fuel Transfer Subsystem?

A

Allows for the transfer of fuel between the internal fuel cells (internal) and from the auxiliary fuel tanks to the internal fuel cells (external).

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21
Q

Fuel Transfer Subsystem Components

What controls IPAS pressurized air to the fuel transfer pump?

A

Fuel Transfer Air Valve

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22
Q

Fuel Transfer Subsystem Components
The IPAS powered, bi-directional fuel transfer pump will move fuel from one cell to the other at a rate of not less than ___ gallons per minute.

A

4 gallons per minute

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23
Q

How many round-magazine does the 100 gallon combo tank hold?

A

242 rounds. 58 in the chute for a total of 300 rounds on board

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24
Q

[CAUTION] - FUEL XFER FAIL

What occurred?

A

One of the following:

  • FWD or AFT Fuel SOV Fail
  • XFER Pump Air Valve Fail
  • XFER Pump Fail
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25
Q

[Advisory] - L EXT XFER FAIL

What occurred?

A

LH external fuel transfer was commanded to ON or OFF and did not respond to the command.

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26
Q

What are the two fuel transfer modes?

A

Automatic (SP Control) or Operator Selectable

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27
Q

What is the purpose of the Fuel Crossfeed Subsystem?

A

Allows both engines to draw fuel from either internal fuel cell. It also provides a positive fuel shutoff during maintenance and emergencies.

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28
Q

The Crossfeed SOVs are ___-way, ___-position ball valves that are controlled by the SP based on inputs from the _____ page, ________, or _______ switches.

A

The Crossfeed SOVs are 3-way, 4-position ball valves that are controlled by the SP based on inputs from the MPD Fuel page, ENG Fire pushbuttons, or ENG START switches.

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29
Q

Under Normal crossfeed valve position, which engine draws fuel from which tank?

A

ENG 1 - FWD

ENG 2 - AFT

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30
Q

What will happen to the crossfeed SOV when an ENG 1 or 2 FIRE pushbutton is pressed?

A

The SP will command the respective Crossfeed SOV to close and cut off fuel.

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31
Q

What is the warning associated with CROSSFEED button selection?

A

The CROSSFEED button shall be set to NORM position at all times while in flight, unless executing an for FUEL PSI ENG 1 or 2.

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32
Q

[CAUTION] - XFEED 1 VALVE FAIL

What occurred?

A

The ENG 1 crossfeed valve has been commanded to move and it did not go to the commanded position.

33
Q

During engine start, the crossfeed is set to what? Why?

A

Crossfeed is set to AFT for that respective engine because only the AFT Fuel Cell contains a boost pump.

34
Q

How much fuel is remaining in the FWD tank when the Low-Level Indication is displayed?

A

240 lb

35
Q

How much fuel is remaining in the AFT tank when the Low-Level Indication is displayed?

A

260 lb

36
Q

[CAUTION] - AFT FUEL LOW

What occurred?

A

The aft fuel cell level has been detected as less than 260 lb or the analog sensor returns a low indication to the SP.

37
Q

[CAUTION] - FWD FUEL LOW

What occurred?

A

The FWD fuel cell level has been detected as less than 240 lb or the analog sensor returns a low indication to the SP.

38
Q

What is the purpose of the Fuel Quantity Subsystem?

A

Measures remaining fuel and detects low levels in the internal fuel cells.

39
Q

What is the purpose of the Fuel Boost Subsystem?

A

Provide pressurized fuel to the engines.

40
Q

How is the fuel boost pump powered?

A

IPAS pressurized air is applied to a motor which drives the pump

41
Q

When is the fuel boost pump turned on?

A

1) Auto during ENG START sequence by the SP

2) Manually by operator selection on Fuel Page

42
Q

[CAUTION] - BOOST PUMP FAIL

What occurred?

A

The pump was commanded on and it has been detected as off, or commanded off and detected on.

43
Q

Where does the fuel boost pump draw fuel from?

A

AFT Fuel Cell

44
Q

Where does the APU Boost Pump draw fuel from?

A

AFT Fuel Cell

45
Q

What drives the APU Boost Pump?

A

Electrical Power from the battery

46
Q

[CAUTION] - APU FUEL VALVE

What occurred?

A

The APU fuel shutoff valve has failed to go to the commanded position.

47
Q

What is the note associated with radio transmissions during refueling?

A

Radio transmissions will be limited to emergencies only until refueling has been completed

48
Q

What is the maximum psi for refueling?

A

55 psi

49
Q

What warning is associated with fuel servicing and weather conditions?

A

Fuel servicing will not be performed during thunderstorms or possible lightning conditions.

50
Q

[CAUTION] - REFUEL VALVE OPEN

What occurred?

A

The refuel valve has been detected as open.

51
Q

Turning the Boost Pump on will command the SP to do what?

A
  • Apply IPAS air IOT power the boost pump

- CROSSFEED AFT

52
Q

What is the primary IPAS air source when both engines are operating?

A

Bleed Air from both engines (approx. 50% from each)

53
Q

Is either engine capable of supplying 100% of the IPAS pressurized air requirement?

A

Yes

54
Q

Other than the engines, what are other sources of IPAS air when on the ground?

A

APU

AGPU

55
Q

IPAS Low-Pressure Components
The _________ limits the flow of bleed air to 6.5% of the total engine compressor core flow in the event of an IPAS leak.

A

Low-Pressure Venturi

56
Q

IPAS Low Pressure Components

Where is the Engine Bleed Air PRSOV located?

A

Downstream of the fifth stage low-pressure air outlet of each engine

57
Q

IPAS Low PSI Components

What is the purpose of the Low Pressure Venturi?

A

In the event of an IPAS leak, it limits the flow of bleed air to 6.5% of the total engine compressor core flow

58
Q

IPAS Low PSI Components
The _____________ reduces the 45-55 pasig air pressure from the engines and maintains a constant / normal air pressure of 25 +/- 3 psig.

A

Bleed Air PRSOVs

59
Q

IPAS Low PSI Components

The ___________ interconnect the PRSOVs to ensure that both engines are supplying an equal amount of bleed air.

A

Flow Share Sense Lines

60
Q

IPAS Low PSI Components

Each engine and the APU have ____________ located downstream of the PRSOVs IOT prevent back flow of pressurized air.

A

Bleed Air Check Valve

61
Q

IPAS Low PSI Components
The _____________ receives low pressure bleed air from the engine(s) / APU / AGPU and distribute it to the using system and components.

A

Primary Manifold / Low Pressure Manifold

62
Q

IPAS Low Pressure Components

The __________ limits max temp of bleed air to 450*C before supplying to components.

A

Bleed Air Precooler

63
Q

IPAS Low PSI Components
True / False - When ON, the APU supplies all pressurized air to the IPAS system even when one or both engine(s) are running

A

TRUE

64
Q

IPAS Low Pressure Components

When does the APU Load Control Valve open?

A

When the APU reaches 95% speed

65
Q

IPAS Low PSI Components
The Bleed Air Over-temperature Switch closes at ___*C, which causes the displays a BLEED AIR HOT advisory to be displayed on the UFD.

A

490*C

66
Q

What (8) components are driven by low-pressure IPAS?

A

ECS, ATS, Fuel System Components, Ice Detector Probe, NIU, Engine Firewall/Cooling, Utility Receptacle, Canopy Defog

67
Q

What does the ECS use IPAS air for?

A

Heating crew stations and the Air Particle Separator (APS).

68
Q

What does the Nitrogen Inverting Unit (NIU) use IPAS air for?

A

To cool, dry, and remove oxygen from the pressurized air which is then routed to the fuel cells.

69
Q

What does the fuel system pressure regulator valve reduce IPAS pressure down to?

A

19 +/- 3 psig

70
Q

IPAS High PSI Components

What supplies regulated High Pressure IPAS air to the hydraulic system reservoirs?

A

Hight Pressure Manifold

71
Q

IPAS High PSI Components

The __________ prevent back flow of high pressure IPAS air to the engines or APU.

A

High Pressure Check Valves

72
Q

IPAS High PSI Components

The _________________ reduce high-pressure bleed air to 31 +/- 3 psig for the primary and utility hydraulic reservoirs.

A

PRI/UTILITY Hydraulic Reservoir Pressure Regulators

73
Q

Once one or both engines are running, the __________ manifold is pressurized by the engine diffuser. The ___________ manifold is still pressurized by the _____ until it is shut down.

A

High-Pressure Manifold

Low-Pressure Manifold, APU

74
Q

When does air from the low-pressure manifold pressurize the primary and utility hydraulic reservoirs?

A

When only the APU is operating.

75
Q

When one or both engines are at 101% Np and the APU is still operating, what supplies pressurized air to the low-pressure manifold?

A

APU

76
Q

[Advisory] - BLEED AIR HOT

What occurred?

A

SP detects a bleed air over temperature condition (>490*C)

77
Q

[Advisory] - ENG 1(2) BLD AIR FAIL

What occurred?

A

SP commands ENG 1(2) Bleed Air PRSOV OPEN or CLOSED, and it did not move as directed

78
Q

[Advisory] - BLEED AIR OFF

What occurred?

A

Bleed Air sources have been manually shut off

SYSTEMS (5 decks)

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