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General Oral Questions > Cleaning And Corrosion Control > Flashcards

Cleaning And Corrosion Control Flashcards

1
Q

How may filiform corrosion be recognized?

A

Its characteristic worm-like trace of corrosion products beneath the paint film.

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2
Q

Name at least one of the principal causes of filiform corrosion:

A

(1) Improper or incomplete curing of wash primer prior to painting
(2) Faliure to keep acidic surface contaminants washed off.

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3
Q

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

A

Sustained tensile stresses and the corrosive environment.

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4
Q

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

A

(1) Cleaning
(2) Lubrification
(3) Treatment
(4) Sealing
(5) Keeping Drain Holes clear
(6) Drain fuel sumps
(7) Using protective covers.

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5
Q

Name at least five areas of an aircraft prone to corrosion.

A

(1) Exhaust trail areas
(2) Battery Compartment
(3) Vent Openings
(4) Bilge Areas
(5) Whell Wells
6) Landing
Gear
(7) Wing Flap Recesses
(8) Piano Hinges
(9) Any areas that can trap water.

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6
Q

Why are piano-type hinges prime spots for corrosion?

A

Piano hinges are corrosion prone due to dissimilar metal contact between the steel pin and aluminum hinge and because of their design, which tends to trap contaminants.

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7
Q

How are piano-type hinges protected from corrosion?

A

Kept clean and lubricated.

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8
Q

What are the proper tools for removing corrosion from anodized aluminum surfaces?

A

Aluminum wool, aluminum wire brushes, non-metalic bristle brushes, or Scotch-Brite.

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9
Q

What are some types light duty cleaning agentes?

A

Soap (synthetic detergents) and water.

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10
Q

Why is an aircraft cleaned before inspection?

A

It enables the mechanics to a more accurate inspection.

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11
Q

What are some types of heavy duty cleaning agentes?

A

Solvents and Emulsions.

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12
Q

What type of agent is preferred for cleaning plastic surfaces such as windshields?

A

Soap and Water.

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13
Q

What general precautions should be use 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.

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14
Q

Why should only recommended cleaners be used on aircraft Fabric or Plastics?

A

Their use causes less deteriorating effects.

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15
Q

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

A

It will remove the oxide coat (protective layer).

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16
Q

What is the most common type of corrosion?

A

Surface.

17
Q

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

A

(1) Stainless steel wool or brush
(2) Aluminium Oxide Paper
(3) Scotch-Brite
(4) Abrasive Blast with glass beads
(5) Hand Polish with aluminum polish and soft cotton cloth.

18
Q

Name at least three factors influencing corrosion.

A

(1) Environmental conditions
(2) Type of Metal
(3) Dissimilar Metal
(4) Condition of protective coatings
(5)Presence of electrolyte and contaminants.

19
Q

Name at least three types of corrosion.

A

(1) Filiform
(2) Freting
(3) Intergranular
(4) Pitting
(5) Galvanic
(6) Surface
(7) Exfoliation
8) Oxidation
(9) Stress.

20
Q

What is generally recommended to clean grease, fuel and oil from aircraft tires?

A

Soap and Water.

21
Q

How may fretting corrosion aluminum be readily identified?

A

It has a dark smoky apperance (appears around and streaming back from
Rivet heads.

22
Q

What ALODINE used for?

A

Treatment deposits a chemically formed oxide on aluminum alloys improve corrosion resistance and enhance paint bonding qualities.

23
Q

Is it permissible use steel wool or steel wire brushes on aluminum surface? 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.

24
Q

What is one of the most destructive and intense forms of corrosion?

A

Pitting.

25
Q

Is there any requirement for cleaning an aircraft prior to an annual or 100 hour inspection?

A

It is not only good but common sense, this is a legal requirement specified in FAR Part 43 Appendix D.

General Oral Questions (12 decks)

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