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General O's and P's > cleaning and corrosion > Flashcards

cleaning and corrosion Flashcards

1
Q

What are the five common forms of corrosion?

A

Filiform, Fretting, Dissimilar metal, intergranular, Surface, and Stress corrosion.

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2
Q

Name at least three factors that influence corrosion?

A

The environment conditions, The temperature, type of metal, availability of electrolytes and dissimilar metals, condition of protective coating

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3
Q

What are the two general conditions that may cause stress corrosion cracking?

A

Sustained tensile stress, and a corrosive environment.

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4
Q

What is the cause of fretting corrosion?

A

when two mating surfaces, which are normally at rest with respect to each other, are subject to motion.

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5
Q

What is the principle cause of filiform corrosion?

A

Surfaces that have been improperly chemical treatment prior to painting.

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6
Q

Where is intergranular corrosion most likely to occur?

A

Typically along the grain boundaries of extruded materials.

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7
Q

What is another name for dissimilar metal corrosion?

A

Galvanic corrosion.

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8
Q

What are the factors which affect the type (form) of corrosion?

A

The form of corrosion varies with atmospheric conditions, size and shape of the metal, the type of
metal, and the corrosion-producing agents present.

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9
Q

What methods are used for removing rust from aircraft materials?

A

Except on highly stressed steel surfaces (like oleo struts), the use of abrasive papers and
compounds, small power buffers and buffing compounds, hand wire brushing and steel wool are all
acceptable methods of removing rust.

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10
Q

What is an acceptable method for removing surface corrosion from titanium?

A

stainless steel brush, aluminum oxide sand paper, Scotch brite, hand polish using aluminum polish and a soft cotton cloth.

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11
Q

What specific operations are part of corrosion-preventative maintenance?

A

cleaning, lubrication, detailed inspection, corrosion treatment, touch up of damaged paint, sealing, use of protective covers, and daily wipe-down of exposed critical areas.

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12
Q

Name the steps for corrosion removal?

A

Clean and strip the corroded areas, remove as much corrosion as possible, neutralize any residual
material remaining in pits and crevices, restore protective surface films and paint.

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13
Q

What tools are approved for cleaning corroded anodized surfaces?

A

Nylon scrubber pads, aluminum wool, and aluminum wire brushes.

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14
Q

What is used to keep corrosion from forming on aluminum alloy?

A

An oxide coating or aluminum cladding.

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15
Q

Name at least one type of surface treatment used on aluminum surfaces.

A

Alodizing, Anodizing

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16
Q

What products should be used to clean an aircraft engine?

A

A fine spray of kerosene or solvent.

17
Q

What is the preferred cleaning agent for plastic and rubber surfaces?

A

Soap and water

18
Q

What should be used to clean grease, fuel or oil from aircraft tires?

A

Soap and water.

19
Q

Why should only recommended cleaners be used on aircraft fabric and plastics?

A

Their use causes less degradation (damaging) of the material.

20
Q

Name 5 areas of an aircraft that are more prone to corrosion?

A

Battery compartments, wheel wells, landing gear, piano hinges, exhaust.

21
Q

What form of corrosion can be found in battery compartments?

A

Direct chemical corrosion.

22
Q

Why are piano-type hinges prime locations for corrosion?

A

Piano hinges use dissimilar metals (steel pins and aluminum hinges), and tend to trap contaminants
between the pin and hinge surfaces.

23
Q

What is used to neutralize a lead-acid battery electrolyte?

A

A solution of baking soda and water.

24
Q

What is the difference between wet wash” and “dry wash” aircraft cleaning?

A

Wet wash (water and an agent) cleaning is used to remove oil, grease. carbon deposits, and soils
with the exception of corrosion and oxide films. Dry wash (compressed air or cloth) cleaning is
used to remove film, dust, and small accumulations of dirt.

25
Q

What are types of light duty and heavy duty aircraft cleaning agents?

A

Light duty cleaning agents are soap and synthetic detergent. Heavy duty cleaning agents are
solvents and emulsion type cleaners.

26
Q

What would you do before cleaning a wind screen?

A

Wet the surface before cleaning to prevent scratching.

27
Q

What does filiform corrosion look like and where can it be found?

A

Filiform corrosion appears to look like thread or worm like puffiness of the painted surface. It
occurs between the metal’s surface and the protective coating.

28
Q

How is the inside of structural tubing prevented from corroding?

A

Hot linseed oil can be poured into the hole, then the excess is drained.

29
Q

Name at least four procedures commonly used in the corrosion preventive maintenance process.

A

(1)Cleaning; (2) Lubrication; (3) Inspection; (4) Treatment

30
Q

What general precautions should be used when washing an aircraft?

A

Avoid or protect areas which may be damaged or contaminated such as: bearings, hinges, sealed
areas, and pitot and static ports

31
Q

What are some types of light duty cleaning agents?

A

Soap and synthetic detergents.

32
Q

What are some types of heavy duty cleaning agents?

A

Solvents and emulsions.

33
Q

What form of corrosion is an attack along the grain boundaries of an alloy that is usually caused by improper heat treatment?

A

Intergranular Corrosion

34
Q

What is the most common type of corrosion?

A

Surface

35
Q

Is it permissible to use steel wool or steel wire brushes on aluminum surfaces? Explain.

A

It is not permissible to use steel wool or steel wire brushes on aluminum because traces of steel can
become embedded in the aluminum and cause corrosion.

36
Q

The lifting and flaking of a metal surface due to the buildup of corrosion products, as a result of
severe Intergranular corrosion, is an indication of what form of corrosion?

A

Exfoliation

37
Q

Why should aluminum metal polish NOT be used on anodized aluminum surfaces?

A

It will remove the oxide coat.

38
Q

How are piano-type hinges protected from corrosion?

A

By being kept as clean as possible and properly lubricated.

39
Q

Why is an aircraft cleaned before inspection?

A

It enables the mechanic to conduct a more accurate inspection.

General O's and P's (10 decks)

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