Fuel Storage + Delivery

Question 1

The fuel systems of an aircraft must be designed to meet the operating requirements of 14 CFR ________.

Answer 1

Part 23

Question 2

The fuel system can be divided into these 3 functional areas:

Answer 2

1) Storage
2) Delivery
3) Distribution

Question 3

Two types of fuel delivery systems:

Answer 3

1) Gravity-feed system

2) Pressure-feed system

Question 4

The ________ system is used on low-wing aircraft.

Answer 4

Pressure feed

Question 5

3 types of Jet fuel and their color:

Answer 5

1) Jet A
2) Jet A-1
3) Jet B
Colorless or Straw

Question 6

3 types of Avgas and their colors:

Answer 6

1) 80 Red
2) 100 Green
3) 100LL Blue

Question 7

3 ways to differentiate Avgas from Jet fuel:

Answer 7

1) Color
2) Viscosity
3) Evaporation Rate

Question 8

T\F

Jet-A evaporates more slowly than Avgas.

Answer 8

True

Question 9

T\F

Avgas is more volatile than Jet-A.

Answer 9

True

Question 10

______ is a term to describe the anti-knock characteristics of Avgas

Answer 10

Octane.

Question 11

T\F

Higher octane Avgas is more susceptible to detonation.

Answer 11

False.

Question 12

Two common fuel related instruments:

Answer 12

1) Fuel Quantity gauge

2) Fuel Flow gauge

Question 13

________ fuel systems must have 150% fuel flow capabilities for normal flight and takeoff.

Answer 13

Gravity feed

Question 14

_______ fuel systems must have 125% fuel flow capabilities for normal flight and takeoff.

Answer 14

Pressure feed

Question 15

T/F

Both gravity feed and pressure feed pumps can draw from more than one tank at a time.

Answer 15

False.

Pressure feed can only draw from one tank at a time.

Question 16

The part of the fuel system where water and sediments can be removed.

Answer 16

Low point drain.

Question 17

The bypass fuel rate should equal ______.

Answer 17

The normal fuel rate.

Question 18

In a pressure feed system each engine requires _______ and _______.

Answer 18

One engine driven pump.

A means for bypass.

Question 19

3 things to remember when routing fuel lines:

Answer 19

1) Rout away from heat sources.
2) Avoid sharp bends, rises and falls.
3) Route below electrical wiring.

Question 20

Pressure feed fuel systems are necessary for these 3 types of aircraft:

Answer 20

1) Turbine aircraft.
2) Fuel injected recip engines.
3) Aircraft with fuel cells lower than the fuel metering device.

Question 21

_______ are used to identify twisting in flexible lines.

Answer 21

Lay lines

Question 22

______ fittings are used to attach lines to components.

Answer 22

AN/MS

Question 23

Reciprocating engine strainers usually have _______ elements.

Answer 23

Coarse.

Question 24

3 types of elements in filters/strainers:

Answer 24

1) Surface filtration
2) Edge filtration
3) Cellulose Fiber filtration

Question 25

Two typical types of engine driven fuel pumps:

Answer 25

1) Spur Gear

2) Rotary Vane

Question 26

Spur gear and rotary vane are two types of ______________.

Answer 26

Engine driven fuel pumps.

Question 27

3 major types of auxiliary pumps:

Answer 27

1) Wobble pump
2) Pulsating electric
3) Centrifugal pump

Question 28

_______ are used to ensure that all fuel in a tank is removed.

Answer 28

Transfer ejectors

aka “jet pumps”

Question 29

3 purposes of the fuel heat exchanger:

Answer 29

1) Heats up fuel (via oil or bleed air) to aid in vaporization.
2) Prevents water from freezing and blocking filters.
3) Aids in cooling oil.

Question 30

Engine driven fuel pumps are all _______ _________ pumps.

Answer 30

Positive/Constant displacement.

Question 31

Auxiliary/Boost pumps are considered ________ _________ pumps.

Answer 31

Variable displacement

Question 32

Water injection in a turbine engine is a means of ________ _______.

Answer 32

Thrust augmentation.

Question 33

Two locations where water may be injected into a turbine engine:

Answer 33

1) Compressor inlet

2) Diffuser

Question 34

A mixture of ______ and ______ is used in a water injection system.

Answer 34

Water.

Methanol.

Question 35

The primary purpose of a boost pump is to prevent _____ and ______.

Answer 35

1) Fuel pump cavitation

2) Vapor lock

Question 36

During refueling, a _______ collects overflowing fuel and directs it to an overboard drain.

Answer 36

Scupper

Question 37

T/F

Each rigid tube should have at least one bend.

Answer 37

True.

This compensates for slight misalignment and vibration.

Question 38

Bends in rigid tubing relieve tension caused by ______ and _______.

Answer 38

Expansion and contraction.

Question 39

Fuel pressure is measured in ______.

Answer 39

PSI/PSIG

Question 40

2 reasons for fuel tank vents:

Answer 40

1) Prevent low pressure/vacuum.

2) Allows for fuel expansion.

Question 41

Fuel volatility is expressed in terms of ______.

Answer 41

Reid vapor pressure.