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Aircraft Maintenance Engineering > AME T109 Reciprocating Engine Maintenance > Flashcards

AME T109 Reciprocating Engine Maintenance Flashcards

1
Q

Specialized Maintenance of the Airframe are what three things?

A

1) Modification
2) Repair
3) Replacement

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2
Q

Specialized Maintenance of the Engine are what four things?

A

1) Reassembly of a multi-part engine crankshaft or a crankshaft equipped with a dynamic counterweight system.
2) Reassembly of the crankcase with an integral supercharger or a propeller reduction gear.
3) Overhaul of a reciprocating engine equipped with an integral supercharger or a propeller reduction gear system.
4) The overhaul of a turbine engine or turbine engine module.

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3
Q

What is the definition of an “Overhaul?”

A

This includes the disassembly, inspection, repair, or replacement, reassembly, testing, and adjustment of anything that falls into the category of Specialized Maintenance.

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4
Q

Overhaul Abbreviations:
What does each below mean?

TT:
TBO:
SMOH:
STOH:

A

TT: Total Time (Since New)
TBO: Time Between Overhauls
SMOH: Since Major Overhaul
STOH: Since Top Overhaul

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5
Q

What is unique regarding a “Top Overhaul?”

A

It is not something that is scheduled due to it not being mandatory.

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6
Q

What are some of the attributing factors for when an Aircraft Engine should be removed for overhaul?
(Three in General)

A

High Oil Consumption

High Operating Temperatures

  • Cylinder Head Temperatures (CHT)
  • Oil Temperature

Poor Engine Performance

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7
Q

What are some examples of causes for a Major Overhaul?

There are many but list at least three.

A
  • Sudden Stoppage.
  • Foreign Object Debris (FOD).
  • Incorrect Fueling.
  • Metal found within a filter.
  • Immersion within water.

And Many More…

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8
Q

Explain a Top Overhaul.

A

The engine remains installed on the aircraft and the cylinders are pulled off for the purpose of being overhauled.

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9
Q

Explain a Major Overhaul.

A

The entire Engine is pulled apart.

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10
Q

For straight overhaul purposes, what must be recorded and carried on in the same Engine Tech Log?

A

The Engine’s Total Time.

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11
Q

What changes in regards to tolerances in Rebuilt Engines?

A

New Tolerances may be given and a new tech log with no references to precvious operations.

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12
Q

What are some examples of accessories that are “On Condition” components and wouldn’t be removed upon Overhaul?

A
  • Vacuum Pumps
  • Hydraulic Pumps
  • Alternators

And Others…

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13
Q

With the exception of any “On Condition” Accessories, what happens to Accessories during Overhaul?

A

They are either removed and inspected or replaced.

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14
Q

What is the definition of the word “Dimension?”

A

A measurement of a component.

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15
Q

What is the definition of the word “Clearance?”

A

A measurement of the space existing between two different components.

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16
Q

What are the six places you may look for references in regards to an aircraft?

A
  • Service Bulletins (SB)
  • Service Letters (SL)
  • Service Instructions (SI)
  • Parts Manual
  • Airworthiness Directives (AD)
  • Type Certificate Data Sheets (TCDS)
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17
Q

In regards to references, an AME is responsible to do what?

A

Use the most up to date information available.

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18
Q

What are some components that are Overhauled along with the engine?

A
  • Starters
  • Magnetos
  • Oil Pump
  • Fuel Pump
  • Carburetor

And Others…

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19
Q

In regards to wiring:

When removing an engine, what component(s) should be disconnected and isolated?

A

Disconnect the battery.

Isolate the ignition.

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20
Q

In regards to fuel lines:

When removing an engine, what should be done to the fuel valves?

A

All fuel valves should be closed.

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21
Q

What do the following abbreviations stand for?

QEC:
SIL:

A

QEC: Quick Engine Change
SIL: Service Instruction Letter

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22
Q

What is a Contour Gauge used for?

A

Used to measure the radius of the Valves.

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23
Q

Overhaul Manual:
When dealing with Minimums and Maximums what does each stand for?

L:
T:

A

L: Loose
T: Tight

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24
Q

Explain what Valve Staking is.

A

When the Rocker Arm is hit to momentarily push the Valve off of its Seat.

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25
Q

What are some repairs that may be made to Crankcases?

A
  • May be welded. (Is Specialized)
  • Studs may be removed and replaced.
  • Helicoils may be added to internal threads.
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26
Q

What are some repairs that may be made to Crankshafts?

A
  • Main Journals may be ground.

- Connecting Rod Journals may be ground Undersize.

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27
Q

What must be strictly adhered to when grinding a component Undersize?

A

Must be ground to very specific dimensions in order to fit the bearing that will be used.

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28
Q

In regards to repair, what is unique about Cylinders?

A

They are almost infinitely repairable.

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29
Q

What are some of the afflictions that Cylinders may suffer from?

A

Scoring
Gauging
Scratching

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30
Q

When one Cylinder needs to be bored oversized, what must be done to the others?

A

All Cylinders must be bored oversized as well.

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31
Q

When boring Cylinders undersized, how would one bring it back to the standard dimension?

A

By chroming it back to the normal dimension.

32
Q

When chroming a Cylinder what internal part must be replaced if it were made of Chrome?

A

Chrome Cylinder Rings.

33
Q

When a Cylinder is bored undersized and nor chromed, what needs to be replaced?

A

The Pistons and Piston Rings must be replaced.

34
Q

Blue Paint is found on Fins, what does this mean?

A

The Cylinder has been nitrided.

35
Q

What does Nitridinng the Cylinder walls accomplish?

A

Nitriding the Cylinder Walls hardens them.

36
Q

Hardening the Cylinder Walls using nitride provides what?

A

Accomplishing this provides a longer life.

37
Q

If the threads of a Cylinder is stripped, what may be utilized to fix this?

A

Helicoils may be installed.

38
Q

Whay must Cylinder Valves have a Margin?

A

Without one, Cylinder Valves would absorb more heat.

39
Q

What is a Cylinder Valve Margin?

A

A contact area between the Valve and the Valve Seat.

40
Q

Having a smaller Cylinder Valve Margin is more effiective that a larger one.
(True or False).

A

True.

41
Q

Describe what Valve Lapping is.

A

This is putting a compound onto the Valve Stem and then proceeding to rub it against the Valve Guide.

42
Q

For correct maintenance, what needs to be applied to the Valve Tips and Faces?

A

Stellite.

43
Q

What is the purpose of the Split Key?

A

It holds the Valve to prevent it from falling into the Cylinder.

44
Q

What are the three general steps to reassembling an Engine?

A

1) Put together sub-assemblies.
2) Cleaning and Protection
3) Lubrication

45
Q

What are some examples of Sub-Assemblies?

Name at least three

A

Connecting Rods to Crankshafts.

Connecting the Crankshaft and Cam Sahfts to the Crankcase.

Putting Piston Rings onto Pistons.

Connecting Valves to Cylinders.

Connecting Cylinders to Crankcases.

Putting the Oil Pump to the Crankcase.

Adding Accesory Gears to the Crankcase.

Adding the Accessory Case to the Crankcase.

46
Q

If a “T” is tacked onto the end of a Clearance Measurement, what does this mean?

A

It means that is is a Tight Fit.

47
Q

To install a component, what needs to be done?

A

One Part would need to be heated and Expanded, another needs to be cooled to Shrink.

48
Q

If an “L” is tacked onto the end of a Clearance Measurement, what does this mean?

A

It means that the fit is Loose.

49
Q

How must Crankshaft Journal Scoring be dealt with?

A

In this instance, Crankshaft Journals must be ground undersized.

50
Q

When Crankshaft Journals are ground undersized what kind of bearing must be installed?

A

An undersized Bearing.

These are called Undersized but are actually larger

51
Q

What is the purpose of a Valve Spring Tester?

A

To test the functionlilty of a Valve Spring.

52
Q

The first that should be done when doing an Engine Test Run is what?

A

Pre-oil the engine.

53
Q

What are the three steps to Pre-oiling an Engine?

A
  • Check for leaks.
  • Prime the Oil Pump.
  • Pre-Lubricate the Engine.
54
Q

What are the two methods to Pre-Oiling an engine?

A
  • The Pressure Pot Method.

- Utilizing the Engines Lubrication System.

55
Q

What kind of oil should be used during an Engine Break-In?

A

Mineral Oil.

56
Q

What is the purpose of an Engine Test Run?

Three Reasons

A

1) Seats the Piston Rings within Cylinders.
2) Burnishes Bearing Surfaces.
3) Adjusts the Fuel Metering System.

57
Q

When preparing an Engine for Packing and Preservation, what kind of Oil is used?

A

Preservation Oil.

58
Q

How many types of Preservation Oil is there and what are its ingredients?

A

No. of Types: 3

Ingredients: Is a Mineral Oil with Wax Additives.

59
Q

What is the purpose of installing dessicants?

A

They keep air in and surrounding components dry.

60
Q

Dessicants Moisture Sensing:

What are Dessicants made up of?

A

Cobalt Chloride Crystals.

61
Q

Dessicants Moisture Sensing:
As dessicants collect moisture, they change colour.

What does each colour below mean?

Blue
Red
White

A

Blue: Dry
Red: 30% Humidity
White: 60% Humidity

62
Q

When reinstalling a Preserved Engine, what four things must be done during a Pre-Installation Inspection?

A
  • Function Checks
  • Independent Checks
  • Primary
  • Leak Checks
63
Q

When performing a Pre-Installation Inspection of a Preserved Engine, when inspecting the Primary Controls, what three things must be closely inspected?

A
  • Throttle
  • Mixture
  • Propeller Pitch Control
64
Q

What do Primary Controls require whenever they are dealt with in an Inspection or Repair?

A

They require an Independent Inspection and a Sign Out.

65
Q

What two things does the Operator’s Manual provide?

A
  • Shows the orientation of components on the engine.

- Has a series of Installation Drawings within it.

66
Q

Provide some examples of actions that fall under the “Servicing” Category.

A
  • Replenishing Fluids (such as adding Oil).
  • Cleaning of Components
  • Lubrication of Parts.
67
Q

Describe what tasks fall under the “Maintenance” Category.

A

Anything that isn’t Servicing.

68
Q

When Hoisting an engine, what information must be known?

A

How heavy the engine is.

69
Q

What cautionary action can be taken to prevent the engine from bouncing during hoisting?

A

Jack up the Engine slowly.

70
Q

You must move the hoist with an engine attached to it, what cautionary measure should be taken?

A

Keep the Engine low to the ground.

71
Q

During hoisting, when should the Hydraulic Ram be mechanically locked?

A

Whenever the hoist is left unattended with a load on it.

72
Q

On a Crankcase, what are some basic things that CAN be repaired?

A

Stripped Threads via a Helicoil.

Cracks and Corrosion may be ground out.

73
Q

What is repairable on a Crankshaft?

A

Scoring or other similar damage may be taken out of it by grinding the component Undersized.

74
Q

What is repairable on a Cylinder?

A

So many things…

Replace Bushings and Valve Guides.

Can bore out Cylinders and Chrome / Nitride them.

75
Q

How would you “recondition” Valves?

A

By grinding or lapping the faces.

Aircraft Maintenance Engineering (12 decks)

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