AAC Corrosion Prevention and Control 1 — Questions and Answers
Question 1: What does the acronym CPCP stand for in Army aviation maintenance?
- Corrosion Prevention and Control Program (Correct answer)
- Component Protection and Coating Procedure
- Corrosion Prevention Compliance Protocol
- Component Preventive Coating Program
Correct answer: Corrosion Prevention and Control Program
CPCP stands for Corrosion Prevention and Control Program, which establishes systematic procedures for preventing and treating corrosion on Army aircraft.
Question 2: Which type of corrosion most commonly affects aluminum aircraft structures and appears as white or gray powdery deposits?
- Galvanic corrosion
- Surface corrosion (oxidation) (Correct answer)
- Intergranular corrosion
- Stress corrosion cracking
Correct answer: Surface corrosion (oxidation)
Surface corrosion (oxidation) is the most common type affecting aluminum, manifesting as white or gray powdery deposits on the metal surface due to reaction with oxygen.
Question 3: What is galvanic corrosion in the context of Army aircraft maintenance?
- Corrosion caused by stray electrical current from the aircraft battery
- Corrosion that occurs when two dissimilar metals are in contact in the presence of an electrolyte (Correct answer)
- Corrosion resulting from mechanical stress on metal components
- Corrosion caused by fuel contamination on metal surfaces
Correct answer: Corrosion that occurs when two dissimilar metals are in contact in the presence of an electrolyte
Galvanic corrosion occurs when two dissimilar metals are in electrical contact in the presence of an electrolyte, causing the less noble metal to corrode preferentially.
Question 4: Which environmental condition most accelerates corrosion on Army aircraft?
- Low humidity and cold temperatures
- High altitude and low atmospheric pressure
- High humidity and salt-laden air (Correct answer)
- Extreme heat and prolonged direct sunlight
Correct answer: High humidity and salt-laden air
High humidity combined with salt-laden air, such as in coastal or marine environments, most rapidly accelerates electrochemical corrosion on aircraft metal surfaces.
Question 5: What is the first step a maintenance technician should take when discovering corrosion on an Army aircraft?
- Apply a corrosion inhibiting compound immediately to stop progression
- Document the finding on the appropriate maintenance form (Correct answer)
- Remove all paint from the affected area before assessment
- Notify the pilot and ground the aircraft pending depot review
Correct answer: Document the finding on the appropriate maintenance form
The first step is to document the finding on the appropriate maintenance form (DA Form 2404) so the discrepancy is officially recorded and can be properly assessed and tracked.
Question 6: Which Army technical manual provides primary guidance on corrosion prevention and control for aviation equipment?
- TM 1-1500-344-23 (Correct answer)
- TM 55-1500-345-23
- AR 95-1
- DA PAM 738-751
Correct answer: TM 1-1500-344-23
TM 1-1500-344-23 is the primary Army technical manual providing guidance on painting and corrosion prevention and control procedures for aviation equipment.
Question 7: What is crevice corrosion and where does it most commonly occur on Army aircraft?
- Corrosion caused by vibration in high-cycle engine components
- Corrosion occurring in confined spaces where moisture and contaminants accumulate and cannot drain (Correct answer)
- Corrosion resulting from paint film failure on exterior upper surfaces
- Corrosion caused by fuel leaks pooling near metal fittings
Correct answer: Corrosion occurring in confined spaces where moisture and contaminants accumulate and cannot drain
Crevice corrosion occurs in confined spaces such as lap joints, under fastener heads, and in gaps where moisture and contaminants accumulate and cannot drain or evaporate.
AAC Corrosion Prevention and Control 1
What does the acronym CPCP stand for in Army aviation maintenance?