Fuel Flashcards by Laura Hofherr

How many fuel tanks does the airplane have?

2 integral tanks

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Where is fuel tank temperature taken?

Left tank

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What types of fuel pumps are in each wing?

Primary ejector pump
ACMP
DCMP (right tank)
3 scavenge ejector pumps

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What is the Primary ejector pump?

Venturi pump with no moving parts and no electrical power used by the respective engine. Powered by motive flow

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What is the purpose of the ACMP?

1.Back-up pump in case of primary ejector pump failure
2.Engine start
3.Crossfeed operations

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What is the purpose of the DCMP?

Used for APU or engine start if AC power or the ACMP is not available

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What is the purpose of the scavenge pumps?

Maintains fuel level in the collector box

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What pump(s) is used once an engine is started?

Primary (main) ejector pump

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What is the purpose of the collector box?

Keeps the fuel pumps submerged
Ensures constant fuel flow to the respective engine

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What is the surge/vent tank?

Collects fuel during wing-down maneuvers and returns it to the main tanks once the wings are level
Equalizes tank pressure with atmosphere in flight and during refueling

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Can fuel be transferred from tank-to-tank or be dumped overboard?

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What happens when the crossfeed switch is selected to LOW 1?

Crossfeed valve is opened
Commands the ACMP 2 to ‘ON’ to provide fuel from the right tank to both engines

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What is the only way to close the engine fuel SOV?

Pull the associated engine fire extinguishing handle

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When will the FUEL 1(2) LO LEVEL EICAS be presented?

On the EICAS display, the digits are provided green and turn amber (equal or less than 600 kg / 1320 lb) or red (equal or less than 300 kg /660 lb) to indicate low fuel quantity when reaching pre-determined quantities.

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Collector box location?

Collector box location?
Inboard section of each wing

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What does the vent system do?

Ensures pressure between tank and ambient remains within structural
limits

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Fuel quantity?

20,935 lbs total

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When does low fuel level warning go on?

660 lbs in the respective tank

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What is the fuel source for the APU?

-Right fuel tank -Left fuel tank through the Cr

Where is fuel temperature taken from?

Left tank
Limit -37 °C

How many engine driven fuel pumps?

How many primary (main) ejector pumps?

2/Motive Flow

How many Scavenge ejector pumps?

6/3 on each side

How many AC electric pumps?

How many AC electric pumps? 2

How many DC electric pumps?1

How many DC electric pumps? 1

Which pump is the primary fuel source to the engine?

Which pump is the primary fuel source to the engine? Ejector pump (Venturi Pump)/ Back UP AC PUMP/ no moving parts.

What do ejector pumps maintain?

What do ejector pumps maintain? Head pressure in the fuel line going to the respective engine.

What does the engine driven fuel pump do?

What does the engine driven fuel pump do? Provides motive flow to the primary ejector pump Provides the pressure for motive flow to scavenge pumps

Where are ejector pumps located?

Where are ejector pumps located? Collector tank

What do scavenge pumps do?

What do scavenge pumps do? 6Total/3 on each side Maintain adequate fuel level in the collector tank

What do AC fuel pumps do?

What do AC fuel pumps do? They are a back up for the ejector pumps. Used for engine start. Take Off and landing Used during crossfeed operations.

What does AC pump 2 provide?

What does AC pump 2 provide? Provides fuel to APU when engine driven pump 2 (EDP2) is not running.

What do AC fuel pumps do?

What do AC fuel pumps do? They are a back up for the ejector pumps. Used for engine start. Take Off and landing Used during crossfeed operations.

What does the DC fuel pump do?

What does the DC fuel pump do? Provides pressurized fuel for normal APU start when AC power or the AC fuel pump 2 is not available.

What fuel pump is used for APU start?

What fuel pump is used for APU start? Batteries "ON" only DC fuel pump in right tank AC powered airplane-ACMP 2 - Right engine running Ejector fuel pump

What does fuel crossfeed do?

What does fuel crossfeed do? Allows fuel to both engines from one tank. Used to correct fuel imbalance.

What is the maximum fuel imbalance? When does the fuel imbalance message clear?

What is the maximum fuel imbalance? 794 lbs When does the fuel imbalance message clear? When within 100 lbs of being balance

What does 'LOW 1' message do? What does 'LOW 2' message do?

What does 'LOW 1' message do? Right wing tank electric pump turns ON and X-FEED valve opens. What does 'LOW 2' message do? Left wing tank electric pump turns ON and X-FEED valve opens.

How do you shut off fuel?

How do you shut off fuel? Pulling the respective fire handles in the cockpit.

Refueling and defueling

Refueling and defueling Single-point or over wing. Powered by BATT 2 or DC buses.

crossfeed is not to be used during

takeoff and landing

unusable fuel per tank

75 lbs

How many water fuel drains?

4 drains and is usually done by MX

How many Magnetic Level Indicators are there?

3 per wing (6 total)

Does fuel imbalance happens when Eng fail?

Does fuel imbalance happens when Eng fail? Yes

Fuel panel, can fueling be done with no ac power? Can dc power be used? Who can turn it on, ground or Maintenance?

Fuel panel, can fueling be done with no ac power? Can dc power be used? Who can turn it on, ground or Maintenance? No. need ac power to pressure fuel. Either GPU or APU has to be on .DC only turns on the panel by Batt BUS 2 Gravity fueling can be done with no power using top the wings.

What happens when xfeed?

What happens when xfeed? Main ejectors are shut down