Corrosion Prevention and Control Flashcards
7 cards from real AAC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Corrosion Prevention and Control flashcards as text
What is the primary purpose of a corrosion inhibiting compound (CIC) applied to Army aircraft?
Answer: To provide a protective barrier that displaces moisture and inhibits the corrosion process
A corrosion inhibiting compound provides a protective barrier that displaces moisture from metal surfaces and contains chemical inhibitors that prevent the electrochemical corrosion process from occurring.
What is intergranular corrosion and why is it particularly dangerous for aircraft structural integrity?
Answer: Corrosion that attacks the grain boundaries within a metal, weakening its structure from within without obvious external signs
Intergranular corrosion attacks the grain boundaries within the metal structure, weakening the material from within without obvious external signs, making it extremely dangerous for structural integrity.
How frequently should Army aircraft be washed to control corrosion accumulation under standard maintenance requirements?
Answer: At least every 30 days, or more frequently based on environmental exposure
Army aircraft must be washed at least every 30 days, or more frequently when operating in corrosive environments such as coastal or desert areas, to remove salt and contaminants that accelerate corrosion.
Which corrosion severity level indicates that damage exceeds allowable limits and requires depot-level repair or component replacement?
Answer: Level 3
Level 3 corrosion indicates that the damage exceeds the allowable limits specified in the applicable technical manual, requiring depot-level repair or replacement of the affected component.
What is the proper technique for removing light surface corrosion from an aluminum aircraft component?
Answer: Using fine abrasive materials and hand tools, working in the direction of the metal grain
Light surface corrosion on aluminum should be removed using fine abrasive materials and hand tools, working in the direction of the metal grain to minimize base metal removal and prevent additional surface damage.
What is the purpose of anodizing aluminum aircraft components in Army aviation?
Answer: To create a hard, corrosion-resistant aluminum oxide layer on the component surface
Anodizing creates a controlled, hard aluminum oxide layer on the component surface that is highly resistant to corrosion and provides an excellent base for subsequent paint adhesion.
Which metal combination creates the greatest risk of galvanic corrosion when used together in Army aircraft construction?
Answer: Copper components in contact with magnesium alloy parts
Copper and magnesium are far apart on the galvanic series, making them the most susceptible combination, with magnesium acting as the anode and corroding rapidly whenever an electrolyte is present.