Cleaning And Corrosion

Question 1

Discuss the general precaution that should be observed when washing and airplane.

Answer 1

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

Question 2

What are some of the more common light-duty cleaning agents?

Answer 2

Soap and detergents

Question 3

What materials are commonly used as heavy duty cleaners?

Answer 3

Solvents and emulsions

Question 4

What are the preferred cleaners for plastic surface such as windshields?

Answer 4

Soap and water

Question 5

What type of cleaning agent is used to remove grease,oil or fuel from aircraft tires?

Answer 5

Soap and water

Question 6

What are the factors that effect the type of corrosion

Answer 6

1. Atmospheric conditions
2. Presence of dissimilar metals
3. The type of metal
4. Condition of protective coatings and size and shape of the metal

Question 7

Name at least three forms of corrosion.

Answer 7

1. Surface 2. Stress 3. Intergranular 4. Fretting and dissimilar

Question 8

Name at least one cause of filliform corrosion.

Answer 8

1. Improper or incomplete curing of the wash primer prior to painting.

Question 9

What are the visible signs of filliform corrosion?

Answer 9

Blistered paint surface or worn or thread-like tracks or patterns under paint.

Question 10

What are the two primary factors that may cause development of stress corrosion cracks?

Answer 10

Corrosive environment and sustained tensile stress.

Question 11

What are the visible signs of fretting corrosion?

Answer 11

Corrosion residue had dark, smoky appearance and often appears around and streaming back from rivet heads.

Question 12

List five examples of areas in an aircraft that are prone to corrosion.

Answer 12

1. Battery compartments 2. Fuel tanks 3. Exhaust tail areas
2. Landing gear and wheel well 5. Galleys and lavatories

Question 13

Provide at least four examples of procedures used to prevent corrosion.

What specific operations for corrosion preventive maintenance

Answer 13

1. Cleaning 2. Lubrication 3. Corrosion Treatment 4. Inspection 5. Touch painting
2. Use of sealants

Question 14

What is the purpose of Alodine?

Answer 14

It is a chemical process that puts a protective file on aluminum alloys. This film prevents corrosion resistance and paint adhesion.

Question 15

Describe the effects of using steel brushes or steel wool to remove corrosion from aluminum surfaces.

Answer 15

They can’t be used because steel particles can become embedded in the aluminum and cause corrosion.

Question 16

Describe the tools that should be used to remove corrosion from anodized aluminum surfaces.

Answer 16

Scotch-brite, fiber bristle brushes, aluminum wool or aluminum wire brushes.

Question 17

What’s the best why to protect piano hinges from corrosion?

Answer 17

Keep them clean and properly lubricated.

Question 18

Is there and requirements for cleaning and aircraft prior to and annual of 100 hour inspection?

Answer 18

It is a legal requirement as specified in the FAR Part 43 Appendix D.

Question 19

What is fretting corrosion

Answer 19

It’s when to surfaces are rubbing together

Question 20

What methods are used from removing dust from aircraft structures

Answer 20

Buffing, abrasive paper, compounds, wire brushes and steel wool

Question 21

Name the steps for cleaning corrosion

Answer 21

1. Clean the area and surrounding area
2. Remove the corrosion and paint in the area
3. Treat the area
4. Than repaint the area

Question 22

What product should be used to clean a aircraft engine

Answer 22

Karisen or solvent

Question 23

What is the difference between wet wash and dry wash aircraft cleaning

Answer 23

Wet wash is for heavier soils and heavy duty cleaning areas

Dry wash is for lighter cleaning such as dust

Question 24

What method should be used to to check the internal structure of a wing for corrosion.

Answer 24

Xray

Question 25

What method should be used for checking a nonferrous metal part for intergranular corrosion

Answer 25

Eddy current