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CLEANING & CORROSION CONTROL FINAL
PRACTICE QUESTIONS WITH DETAILED
EXPLANATIONS 2026
โ What tools may you need when visibility inspect something? ( points) Answer: 1. Eyes
- Light
- Mirror
- Boreoscope
- Magnifying glass
- Scribe
- Cleaning tools โ Explain the use of Dye Penetrate. (2 points) Answer: 1. Used to detect stress corrosion.
- limited to openness of cracks โ Explain the use of ultra sound. Answer: 1. Used to detect subsurface and intergranular corrosion.
โ Explain the use of Radiology (X-ray). Answer: 1. Detects most areas of corrosion
- advantage: gives the ability to see inside from the outside.
- Disadvantage: expense, training involved, hazard of radiation contamination. โ What are the 10 areas prone to corrosion? Answer: 1. Engine Exhaust areas
- Battery compartment
- Food service and lavatories
- Landing gear
- External skin Areas
- Hidden (recessed) areas
- Engine mounts
- Control Cables
- Welds
- Electrical equipment โ What causes corrosion in engine exhaust areas? (2 points) Answer: 1 Energy rich exhaust gases contain components as active electrolyte.
- Elevated temperature
Answer: Clean often, maintain protective film (paint) โ What causes corrosion in landing gear? (5 points) Answer: a. Abrasion- form debris, can work to remove lube and coatings b. Dirt and grease- hold water and contaminates. c. Chemical attacks- from ice control chemicals d. Galvanic corrosion f. Complex assemblies, fittings, switches make the area difficult to completely protect. โ What is the solution to corrosion in landing gear? (3 points) Answer: a. Keep it clean b. Keep corrosion protection in place (paint) c. Keep lubed โ What is the cause of corrosion on external skin areas? (3 points) Answer: a. Water collecting at seams and lap joints b. Abrasive damage to leading edges of wings, control surfaces, and engine inlets c. Spot welding seams
โ What is the solution of corrosion on external skin areas? ( points) Answer: a. Keep it clean b. Paint c. Abrasion strips (inlet areas) โ What is the solutions of corrosion in hidden (recessed) areas? ( points) Answer: 1. Fuel tanks-inspect
- Piano hinges- clean, dry, and lube
- Control surfaces recesses- inspect, lube
- Bilge area- clean, check drain holes, lube โ What causes corrosion on engine mounts? (3 points) Answer: a. Heavy current flow causes a potential difference. b. Stress and strain c. High temperature โ What is the solution to corrosion on engine mounts? (2 points) Answer: a. Protected inside with hot linseed oil b. Keep painted
โ What is the cause of corrosion to electrical equipment? Answer: Carrying current in corrosion-prone metals โ What is the solution to corrosion to electrical equipment? Answer: Keep clean and dry โ How do you prevent corrosion from occurring? Answer: remove one of the three things that must be present for it to happen. โ What is the easiest and cheapest method of corrosion prevention? Answer: Cleanliness โ What type of soaps should be used to to clean an aircraft? Answer: Mild, and light duty. โ What is acetone? Answer: a fast evaporating, water solution solvent โ What is Aliphatic naphtha? Answer: may be used on acrylics and rubber
โ What is Aromatic naphtha? Answer: will damage acrylics and rubber โ
