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Hangar > Project 2: Carburetor & Fuel Injection System > Flashcards

Project 2: Carburetor & Fuel Injection System Flashcards

1
Q

What is meant by the term isolation and how is it accomplished?

A

Locking out a particular system such as electrical, securing that switch or system in a way so it cannot be inadvertently actuated and placarding to communicate

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2
Q

What type of fire extinguisher is used for Carburetor & Fuel Injection System?

A

Class B

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3
Q

How do you ensure that there will be no electrical shorts that could lead to a fire?

A

Either disconnect battery or pull all related circuit breakers and place placards on them

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4
Q

Safety precautions for fuel control systems

A

shut off fuel system, fuel lines capped to prevent leaks and contamination, label all items removed

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5
Q

why is pre-removal inspection carried out?

A

in order to determine if there are any issues so that they can be rectified while the component is at the repair facility not once it returns

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6
Q

what items are inspected during pre-removal?

A

the carb and attaching parts, controls, fluid lines, and induction air-box

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7
Q

procedures for removing carburetor

A

pre-removal inspection
shut-off fuel and drain carburetor
remove cables, air-box, fuel lines
remove carburetor

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8
Q

What standards of airworthiness must be carried out that are applicable to this task in accordance with Standard 571.10 “Types of Work Table” (after Re & Re)

A

Carry out a pressure leak test and an Independent or dual inspection

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9
Q

What items are inspected during the completion of the rigging and dual inspection?

A

Correct installation of safety devices
Correct installation of cable & hardware
correct sense of motion and correct travel (“Cushion”)

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10
Q

Who can sign the duel inspection?

A

AME, AMO, or an Authorized Pilot

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11
Q

What are typical faults found in induction systems?

A

Loose or missing hardware clamps
leaking gaskets & couplings
fuel stains

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12
Q

What is inspected when examining engine hoses?

A 
Kinks and twists
proximity to heat sources
leaks
chafing & deterioration
age of the hose
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13
Q

How do you tell the age of an engine hose?

A

Manufacturing info is on the metal i.d. tag

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14
Q

What is the make and model # of the engine used for fuel injection?

A

Continental TSIO-520

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15
Q

What are the advantage of fuel injection?

A

Fuel/Air mixture is distributed evenly

no icing

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16
Q

Primary components of the fuel injection system, in sequence with the flow of fuel through the system

A

Injector pump
Fuel/Air mixture control unit
fuel manifold valve
injector nozzle

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17
Q

what subassemblies are incorporated in the fuel/air mixture control unit?

A 
Throttle assembly (throttle valve)
Fuel control assembly (mixture valve & metering valve)
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18
Q

What are the main components in the injector pump?

A

vapour separator, vane pump, relief valve, variable orifice, bypass valve and mixture valve

19
Q

purpose of bypass valve

A

ensure fuel supply to the engine during start up (boost pump pressure open)

20
Q

what is the purpose of the relief valve?

A

maintain constant pressure at low power settings

21
Q

function of the variable orifice

A

controls fuel pressure at and above cruise power settings

22
Q

2 maintenance adjustments on the injector pump assembly

A 
relief valve (low unmetered fuel pressure)
variable orifice (high unmetered fuel pressure)
23
Q

2 cockpit control inputs to the fuel/air control unit

A

throttle & mixture

24
Q

where is the excess fuel form the mixture valve routed?

A

back to the inlet of the injector pump

25
Q

what are 2 common additional names for the fuel manifold valve?

A

Distributer and Spider Valve

26
Q

what is the purpose of the manifold valve?

A

even distribution of fuel to all cylinders

27
Q

what internal component is controlled by the diaphragm?

A

cut-off valve

28
Q

How is positive fuel shut-off achieved during engine shutdown? (how does the manifold works)

A

spring tension when the fuel pressure drops (spring closes when there’s no fuel pressure)

29
Q

proper orientation of the manifold valve vent

A

face towards the back of the engine

30
Q

what is a common cause of engine run-on during shutdown?

A

clogged vent on the spider valve

31
Q

why are there loops and bends on the fuel lines between the manifold valve and injector nozzles?

A

to ensure all lines are the same length for equal distribution

32
Q

what method is used to identify the size of nozzle metering jet?

A

A letter (A,B,C) is stamped on the hex flat of the nozzle

33
Q

what is the purpose of mixing air with fuel?

A

provides proper atomization

34
Q

what is the source of air for the fuel nozzles?

A

Upper Deck pressure

35
Q

why cant ambient air not be used for atomization on a turbocharged engine?

A

manifold pressure is higher than ambient pressure

36
Q

how can a clogged nozzle be identified?

A

fuel stains on the cylinder head

37
Q

how do you know if idle speed is correctly adjusted?

A

check the rpm gauge when the engine is at idle

38
Q

where is idle speed adjusted?

A

spring-loaded adjustment screw at the throttle valve

39
Q

how is idle mixture adjusted?

A

adjusting the length of the connecting rod between the fuel metering valve and the throttle valve

40
Q

how do you verify proper idle mixture adjustment?

A

slight rise in rpm in idle cut-off

41
Q

where is max rpm adjusted?

A

on the governor

42
Q

What is required if an adjustment is made to the fuel injection system?

A

the other adjustments must be rechecked as they affect one another

43
Q

what certification requirements need to be complied with to allow the aircraft to return to service?

A

independent check and maintenance release

Hangar (3 decks)

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