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Powerplant > Fuel Systems > Flashcards

Fuel Systems Flashcards

1
Q

What are the 2 types of fuel systems?

A

Gravity & Pump

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2
Q

What are the 8 basic fuel system components?

A

Tanks
Lines
Valves
Filters
Gauges
Pumps
Warning Signals
Primer

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3
Q

What FAR is for airworthy fuel systems on aircraft certificated prior to Aug 29 2017? What does it state?

A

FAR 23.955
Gravity fuel systems 150% take off
Pump fuel systems 125% take off
No sharp bends in lines
Separate from electrical wires

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4
Q

What FAR is for airworthy fuel systems on aircraft certificated after Aug 30 2017? What does it state?

A

FAR 23.2430 (a) (3)

Provide the fuel necessary to ensure
each powerplant and APU functions
properly

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5
Q

What is the FAR for fuel systems on transport aircraft?

A

FAR 25.955

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6
Q

What is the FAR for fuel systems on Rotorcraft?

A

FAR 27.955

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7
Q

The fuel storage system must
provide fuel for at least _________
of operation at maximum continuous
power or thrust and be capable of
jettisoning fuel safely if required for
landing.

A

one-half hour

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8
Q

What 2 identifiers are required to be on the filler port placard?

A

Fuel type & Fuel grade

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9
Q

What are the 3 types of fuel tanks?

A

Rigid removable
Bladder
Integral

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10
Q

Integral fuel tanks must have _____ _____ for inspection and repairs of the
tanks and other fuel system
components.

A

access panels

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11
Q

What are the 4 most common types of fuel quantity indicators:

A

• Sight Glass
• Mechanical
• Electrical
• Electronic Capacitance

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12
Q

What is Vapor Lock?

A

Vapor lock is pockets formed by this
premature vaporization restrict the
fuel flow through units which are
designed to handle liquids rather
than gases

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13
Q

What are the 3 general causes of vapor lock?

A

The lowering of the pressure
on the fuel

High fuel temperatures

Excessive fuel turbulence.

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14
Q

What are 3 ways to reduce the possibility of vapor lock?

A

Keep fuel lines away from sources of heat

Sharp bends
&
Steep rises

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15
Q

What is the major improvement in reducing vapor lock?

A

The incorporation of booster pumps in the fuel system

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16
Q

What is the name for the main strainer?

A

Gascolator

17
Q

What is the purpose of the gascolator?

A

Prevent foreign matter from entering
the fuel metering unit

18
Q

Where is the gascolator located?

A

At the lowest point in the system

19
Q

Where are the other strainers/filters located?

A

In the tank outlet and inlet to fuel metering unit

20
Q

What is the fuel pressure for a float carburetor?

A

0.5 - 8 psi

21
Q

What is the fuel pressure for a pressure carburetor?

A

12 - 17 psi

22
Q

What is the fuel pressure for fuel injection?

A

5 - 30 psi

23
Q

Where is the shutoff valve located?

A

Aft of firewall (outside of the engine compartment)

24
Q

What does the main pump do?

A

Feeds fuel to engine during normal
flight

25
Q

What does the auxiliary (boost pump) do?

A

Provide fuel for priming and
starting the engine
Also provides adequate inlet
pressure to engine pump to prevent
vapor lock

26
Q

When is the auxiliary (boost pump) used?

A

Operated during :
High Altitude
Take off and landing
High Temperature

27
Q

What are the 3 types of pumps?

A

Wobble
Diaphragm
Vane

28
Q

What is the most common pump on smaller aircraft?

A

Diaphragm
(Engine driven)

29
Q

What is the most common pump on large reciprocating engines?

A

Vane
(Engine driven)

30
Q

What is positive displacement?

A

All fuel that enters pump will pass through
(Must have a pressure relief valve)

31
Q

What is a compensated type mixture control?

A

Uses a diaphragm to compensate
fuel pressures as altitude changes

32
Q

Vane pumps must also have a ______ valve

A

Bypass

33
Q

What is a bypass valve?

A

Lets fuel bypass main section of
pump for engine start and in case of
an inoperative pump

34
Q

What is a plunger pump?

A

An electrically operated auxiliary pump

Powerplant (18 decks)

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