Fuel Tanks, Fuel Systems

Question 0

Can a pump draw fuel from more than one tank at a time?

Answer 0

No.

Question 1

What parts of 14 CFR define the airworthiness standards for the design and construction of aircraft?

Answer 1

Parts 23, 25, 27, 29, 31.

Question 2

What is meant by “Critical Temperature” when talking about vapor formation?

Answer 2

The temperature at which the fuel turns to vapor.

Question 3

Does the fuel quantity indicator need to be adjusted to account for unusable fuel?

Answer 3

Yes.

Question 4

Do all fuel filling points need to have a provision for electrically bonding the aircraft to the fueling equipment? What are the exceptions?

Answer 4

Yes, except pressure fueling connection points.

Question 5

What is the requirement for the airspace of tanks of they have interconnected outlets?

Answer 5

The airspaces of the tanks must also be interconnected.

Question 6

Do aircraft engines require dedicated fuel pumps for each engine?

Answer 6

Yes.

Question 7

What is sometimes used to prevent fuel from shifting rapidly during flight maneuvers?

Answer 7

Internal baffles

Question 8

When installing a bladder type fuel tank, what is important to ensure about the bottom of the tank and why?

Answer 8

That there are no wrinkles on the bottom.

Question 9

What three ways are fuel valves operated?

Answer 9

Manually, solenoid, electric motor.

Question 10

All aircraft valves have a means to positively identify the position of the valve at all times.

Answer 10

True!

Question 11

What are the two most common electric motor operated fuel valves?

Answer 11

Gate valve, plug type.

Question 12

What is the other means to operate electrically a remotely located fuel valve?

Answer 12

Through the use of electric solenoids.

Question 13

How is the flow of fuel regulated in most vane pumps?

Answer 13

Most vane pumps have an adjustable pressure relief feature.

Question 14

If a vane type pump gets blocked, what is used to allow fuel to flow through the pump?

Answer 14

Relief valve.

Question 15

Where is the main fuel strainer normally located?

Answer 15

At the lowest point the system.

Question 16

What is a gascolator?

Answer 16

A fuel strainer, or filter, that also incorporates a sediment collection bowl.

Question 17

Why is it imperative that jet fuel be clean and contaminant free?

Answer 17

Because turbine engine fuel control units are extremely close tolerance devices.

Question 18

What does an air/fuel heater use to heat the fuel?

Answer 18

Warm compressor bleed air.

Question 19

What does an oil/fuel heater use to heat the fuel and what else does it do as it heats the fuel?

Answer 19

It uses hot engine oil to heat the fuel, it cools the oil as well.

Question 20

What are the five parts of an electronic fuel quantity system?

Answer 20

Transmitter
Probe
Trimmer
Microchip
Precalibrated quantity indicator

Question 21

What are the five sub systems of jet transport fuel systems?

Answer 21

Storage, vent, distribution, feed, indicating.

Question 22

What is the purpose of surge ranks on jet transport aircraft?

Answer 22

They are used for fuel overflow and fuel system venting.

Question 23

How is the venting requirement on jet transport aircraft accomplished?

Answer 23

Check valves, float valves, multiple vent locations.

Question 24

What are the four basic classifications used to describe fuel leaks?

Answer 24

Stain, seep, heavy seep, running leak.

Question 25

What are the steps to troubleshooting?

Answer 25

Gather as much information about the problem as possible, Replicate the problem Understand the proper operation of the system Determine all possible causes of the problem Work from simplest/cheapest to most complex/expensive.

Question 26

Where do you go to find out what must be inspected?

Answer 26

14 CFR 43 Appendix D AC 43.13 Latest version of the aircraft service manual

Question 27

What are the different types of inspections?

Answer 27

``` Pre flight 50 hour 100 hour Annual Progressive ```

Question 28

What are the different kinds of leaks?

Answer 28

Stain, seep, heavy seep, running leak.

Question 29

Where are locations to look for probable leaks?

Answer 29

Around seams and joints, Around fluid lines and fittings, Around the area of seals and gaskets.

Question 30

What types of contaminants are there?

Answer 30

Solid contaminants Water Microorganisms Surfactants

Question 31

What are ways of detecting contaminants?

Answer 31

White bucket test, millipore test.

Question 32

What are parts are involved in component operation?

Answer 32

Boost pump, selector valve, primer.

Question 33

What must be done to repair minor leaks in rigid tanks?

Answer 33

Minor leaks can be repaired by sloshing.

Question 34

How might one repair major leaks in a rigid tank?

Answer 34

Welding or soldering

Question 35

What must be done before a tank can be soldered or welded?

Answer 35

It must be purged.

Question 36

Where do most bladder tank problems arise from?

Answer 36

Allowing the tank to sit dry for too long.

Question 37

How do you repair bladder tanks?

Answer 37

Bladder tanks have a finite life, but localized leaks can be repaired with a rubberized patch.

Question 38

Where do fluid lines usually leak?

Answer 38

Where the line goes through a bulkhead or rubs another component.

Question 39

What should not be done when trying to eliminate leakage in a line?

Answer 39

Over tightening the fittings.

Question 40

Where should Teflon taps not be used?

Answer 40

On flared fittings

Question 41

What should be checked on the fuel selector?

Answer 41

Check to confirm the fuel is being shut off when the selector is in the off position.

Question 42

What is Avgas grade based on?

Answer 42

Octane eating content

Question 43

What is volatility?

Answer 43

A measure of a liquids tendency to change into a gas.

Question 44

What colour is 82UL octane marked as?

Answer 44

Purple

Question 45

What is 100 octane rated as?

Answer 45

Green

Question 46

What is 100 low lead ( 100LL) marked as?

Answer 46

Blue

Question 47

What is detonation?

Answer 47

When fuel burns violently, instead of smoothly and evenly.

Question 48

What is pre ignition?

Answer 48

Early ignition of the fuel/air mixture caused by a hotspot in the cylinder.

Question 49

The higher the vapor pressure is, the higher the ________?

Answer 49

Volatility

Question 50

What is Jet A?

Answer 50

Pure, highly refined kerosene

Question 51

What is Jet B?

Answer 51

A mixture of kerosene and gasoline.

Question 52

What is viscosity?

Answer 52

Internal resistance to flow

Question 53

What is microbial growth?

Answer 53

Hydrocarbons in turbine fuel

Question 54

What are two methods of fueling?

Answer 54

Over the wing | Single point

Question 55

What are methods of defueling?

Answer 55

Single point Siphon Drain

Question 56

What is "fuel transfer process"?

Answer 56

The ability of the crew to move fuel from one tank to another by means of valves and pumps .

Question 57

Gravity fed systems are used in what type of aircraft?

Answer 57

High wing aircraft with fuel tanks above the engine.

Question 58

Name two places that sumps are located.

Answer 58

At the lowest point in the system | Lowest part of the tanks

Question 59

Name three types of fuel quantity indication systems.

Answer 59

Electrical Electronic Manual

Question 60

What is meant by the term "integral tank"?

Answer 60

Tanks that are integrated into the wing by sealed off sections of the wing structure.

Question 61

Name two types of hand operated fuel valves.

Answer 61

Cone | Poppet

Question 62

Name two constant pressure pumps.

Answer 62

Centrifugal | Pulsating plunger

Question 63

What is fuel cross feed?

Answer 63

When either engine can draw fuel from | Any tank selected.

Question 64

Why are fuel tanks vented to each other?

Answer 64

In gravity fed systems, to ensure equal pressure when both tanks feed the engine.

Question 65

What is the purpose of surge tanks on jet transport aircraft?

Answer 65

They are used for fuel overflow and fuel system venting.

Question 66

How is the venting requirement on jet transport aircraft accomplished?

Answer 66

Check valves, float valves, multiple vent locations.

Question 67

What is the benefit of single point fueling?

Answer 67

It allows all the tanks to be filled from a single point.

Question 68

What specific documents should be used to troubleshoot a fuel system?

Answer 68

Troubleshooting charts | Flow diagrams.

Question 69

How are riveted fuel tanks sealed?

Answer 69

With a fuel resistant compound.

Question 70

Why is it important to keep bladder tanks wet?

Answer 70

To prevent drying and cracking of the bladder material.

Question 71

Why should a water fire extinguisher not be used on a fuel fire?

Answer 71

Fuel is lighter than water and using a water type extinguisher could spread the fuel around without extinguishing it.

Question 72

Why do tanks need to be purged before welding?

Answer 72

To remove fuel vapors to prevent explosion.

Question 73

In a fuel injection system, where is excess fuel during operation routed?

Answer 73

Back to the pump, which then pumps it through the selector valve into the appropriate reservoir tank.