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Phenom Info > Fuel System > Flashcards

Fuel System Flashcards

1
Q

What is the fuel system designed to do?

A

To continuously provide fuel to the engines

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2
Q

What does the Fuel System incorporate?

A

Storage - two vented integral fuel tanks in the wing, interconnected by an interwing fuel transfer valve

Distribution - engine feeding and tank refuelling/de-fuelling

Indication: Fuel system parameters and indications are displayed on the MFD synoptic page and fuel data pages
System messages are displayed on the PFDs

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3
Q

How is normal engine feed done?

A

Normal engine feed is done through ejector pumps.

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4
Q

How do the ejector pumps operate?

A

The ejector pumps in each collector tank are driven by high-pressure motive flow returned from the engines.

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5
Q

Is electrical power required for normal engine fuel feed operation?

A

Electrical power is not required for normal engine fuel feed operation

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6
Q

What is used to Minimise useable fuel?

A

Scavenge ejectors

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7
Q

What do the fuel tanks incorporate?

A

One collector tank
One surge tank
One main tank

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8
Q

When operating in engine suction mode (jet pump and DC pump failed on the same tank) what is the unusable fuel?

A

The unusable fuel quantity rises to 41.4 kg per tank.

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9
Q

When can fuel not be transferred from one wing to another?

A

When fuel quantity reaches 140kg for single engine operation and 165 kg for two engines operating.

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10
Q

What is the Maximum Fuel Capacity?

A

1292 kg

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11
Q

What is the Maximum useable fuel?

A

1272 kg ≡ 636 kg/tank

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12
Q

What is the unusable fuel?

A

20 kg ≡ 10 kg/per side

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13
Q

What does the collector tank hold?

A

100kg

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14
Q

What is the max imbalance?

A

100kg

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15
Q

What is the purpose of a NACA Inlet?

A

As the aircraft climbs and descends the differential pressure in the tanks changes. The vent system is designed to keep the pressure between the tanks and the atmosphere within the structural limits of the aircraft.

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16
Q

What is the purpose of a float vent valve?

A

The float vent valve equalises the pressure between the surge tank and the rest of the fuel system. As the fuel level drops, the float valve opens allowing the pressure in the tanks to equalise. When the aircraft manoeuvres or the tank is refuelled the float valve closes preventing fuel entering the surge tank.

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17
Q

What is the purpose of Flap Valve?

A

Flap valves within the tanks direct fuel by gravity from the wing tip to the wing root.

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18
Q

What is the purpose of a Baffle Check Valve?

A

The 2.2 in. baffle check valves are one-way flapper valves that control the flow of fuel inboard

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19
Q

What is the purpose of a Drain Valve?

A

The aircraft can be de-fuelled, by the engineers, via the dump valve on the underside of the wing. Within the dump valve is the water drain valve. Fuel cannot be dumped whilst airborne.

Fuel imbalances can be corrected using the fuel transfer valve. The ball valve is opened by pushing in the fuel transfer valve button on the Fuel Control Panel.

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20
Q

What fuels are cleared for the Phenom?

A

F-34/JP8
F-35/Jet A-1
F-44/Jet A

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21
Q

How are the LP Fuel Feed systems powered and where are they located?

A

There are two DC electric pumps installed in the LP fuel system, one in each of the collector tanks.

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22
Q

How are the DC electric pumps powered?

A

They are a 28 V DC electronically controlled motor supplied by the EMERGENCY BUS bar.

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23
Q

How many sets of Jet Pumps are within the LP Fuel Feed system and how are they comprised?

A

There are 2 sets of jet pumps within the LP fuel system.
The scavenge ejector pump transfers fuel from the main tank to the collector tank.
A separate jet pump, the engine feed ejector pump, transfers fuel from the collector tank to the engine itself.

24
Q

How do Jet Pumps operate?

A

Jet pumps rely on the venturi principle and have no moving parts.

25
Q

Why does the engine driven HP pump supply more fuel than the engine requires?

A

To provide the motive flow for both sets of jet pumps.

26
Q

What is the purpose of a one way check valve within fuel feed lines?

A

Prevents fuel flowing in the incorrect direction.

27
Q

Where are the fuel shutoff valves and pressure switches located?

A

In each engine feed line.

27
Q

What is the purpose of a fuel shutoff valve and how do they operate?

A

The fuel shutoff valve stops the flow of fuel in case of engine fire. The valves are operated by the Eng Shutoff switches on the Fire Extinguisher panel in the cockpit.

28
Q

What is the purpose of a pressure switch?

A

The pressure switch monitors the fuel pressure within the LP system.

29
Q

What is the normal fuel operating pressure?

A

8 psi

30
Q

What would the fuel pressure have to drop below before you get an CAS message?

A

6 psi

31
Q

What CAS message would you get when the fuel pressure drops below 6 psi?

A

A CAS FUEL LOW PRESS caption is generated. If the DC pump switches are set to AUTO, the EFCU will command the DC pump to run on the affected side.

32
Q

What is the engines core rotator speed N2 at idle?

A

With the fuel pumps and ignition set to auto on the Fuel Control Panel and the Eng Control Panel, when Start is selected the starter generator drives the HP shaft to 44% N2.

32
Q

What is the FMU?

A

The FMU, attached to the accessory gearbox and controlled by the FADEC, meters and distributes the correct amount of fuel under all operating conditions.

33
Q

Having reached idle on start what does the FADEC do?

A

The FADEC sends a signal to the Generator Control Unit to disconnect the starter from the Accessory Gearbox and connect the generator to the electrical system. The FADEC now controls the engine and fuel systems.

34
Q

What major functions does the FMU perform?

A

The FMU performs the following major functions:
Pressurisation of fuel supply
Regulates fuel amounts to the injectors
Regulates primary and secondary fuel flow
Engine shutdown in normal and emergency conditions
Supply of motive fuel
Prevention of discharge of fuel after engine shutdown

35
Q

What supplies the FMU?

A

The LP fuel system supplies fuel to the Fuel Management Unit.

36
Q

How many stages are there FMU fuel pressurisation?

A

The FMU pressurises the fuel in three phases.

37
Q

What is the first stage in FMU Pressurisation?

A

The first stage involves fuel being supplied by the engine ejector pump to the second stage centrifugal pump. This is run by a shaft from the AGB. The centrifugal pump ensures that the HP pump is constantly supplied with fuel, preventing cavitation. The fuel then passes through a Fuel Oil Heat Exchanger which maintains the fuel temp above 0°C. Fuel then flows through the fuel filter to the HP pump. Should the filter become blocked there is a bypass valve and a CAS warning is generated in the cockpit.

38
Q

What is the second stage in FMU Pressurisation?

A

From the HP pump the fuel is split 3 ways. One path returns fuel to the jet pumps as motive flow. The second path returns to the fuel line upstream of the HP fuel pump and the third path flows to the fuel injectors via the flow divider. The flow divider controls the flow of fuel during engine start to ensure the correct light up regime in the primary and secondary manifolds.

39
Q

How many nozzle injectors does each engine have?

A

Each engine has 14 fuel nozzle injectors. These are split into primary and secondary stage nozzles(7 of each). The nozzles atomise the fuel and spray it into the combustion chamber.

40
Q

What is the minimum fuel temp?

A

-37°C.

41
Q

What is the maximum fuel temp on the ground?

A

52°C.

42
Q

What is the maximum fuel temp in the air?

A

Maximum fuel temperature, in flight, may be extended to, but not exceed, 80°C.

43
Q

Where is the Fuel Control Panel located?

A

The fuel control panel is located on the main instrument panel to the left of the pilot’s yoke.

44
Q

What does the Fuel Control Panel consist of?

A

It consists of 2 switches controlling the DC electrical pumps and a push button that controls the fuel transfer valve. Each engine has a dedicated fuel pump selector switch.

45
Q

How many states does the Fuel Pump Selector Switch have? And what are they?

A

3

ON - activates the fuel pump
AUTO - automatically operates the fuel pump according to the FADEC logic
OFF - deactivates the fuel pump

46
Q

What are the two states of the Fuel Transfer Valve? (XFR)

A

PUSH OUT - closes the fuel transfer valve
PUSH IN - opens the fuel transfer valve to allow any lateral imbalance in fuel to be corrected

47
Q

When must the fuel transfer button be out?

A

For take off, landing, turbulence and manoeuvres.

48
Q

How can you tell if the Fuel Transfer Valve is open?

A

A white strip in the middle of the button indicates that the transfer valve is open.

49
Q

What is the fuel synoptic page?

A

It provides a visual representation of the fuel system operation and parameters and is capable of indicating multiple statuses for each component.

50
Q

What are electric fuel pump statuses?

A

They are depicted as a circle with an internal windmill representing the pump status:

ON - Green windmill, grey circle
OFF - White windmill, grey circle
FAILED - White windmill, grey circle beneath a red X

51
Q

When can you balance fuel?

A

Straight, Level and Trimmed

52
Q

When would the Fuel quantity indicators go Yellow and Black?

A

Below 90kg in either tank

53
Q

When does the fuel imbalance caption disappear?

A

Disappears when fuel imbalance <60kgs

54
Q

When will the Fuel Equal caption show?

A

<40 Kg

Phenom Info (35 decks)

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