ASTM NCATT Aircraft Wiring Repair Assessment
Newest (2025 - 2026 Update) From Real Past
Papers Questions – A Set Of 100 Most Common
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Recommendable For Grade A+
1. Which document provides the approved method for repairing aircraft
wiring?
A. Aircraft logbook
B. Pilot operating handbook
C. Aircraft Maintenance Manual (AMM)
D. Flight plan
Answer: C. Aircraft Maintenance Manual (AMM)
Explanation: The AMM contains manufacturer-approved wiring repair
procedures and must always be followed.
2. What is the primary purpose of wire identification markings?
A. Increase conductivity
B. Improve flexibility
C. Identify the wire's function and destination
D. Reduce resistance
Answer: C. Identify the wire's function and destination
Explanation: Wire markings allow technicians to correctly identify circuits during
installation and troubleshooting.
3. Which tool is specifically designed for removing insulation without
damaging the conductor?
A. Diagonal cutters
, B. Utility knife
C. Wire stripper
D. Aviation snips
Answer: C. Wire stripper
Explanation: Proper wire strippers remove insulation while protecting conductor
strands.
4. What is the most common conductor material used in aircraft wiring?
A. Aluminum
B. Steel
C. Brass
D. Copper
Answer: D. Copper
Explanation: Copper provides excellent electrical conductivity and mechanical
strength.
5. Why should damaged wire strands never be left after stripping?
A. They improve conductivity.
B. They reduce resistance.
C. They weaken the conductor and reduce current-carrying capacity.
D. They prevent corrosion.
Answer: C. They weaken the conductor and reduce current-carrying capacity.
Explanation: Broken strands increase resistance and reduce mechanical
strength.
6. Which splice is generally preferred for aircraft wire repair?
A. Household twist splice
B. Tape splice
C. Approved environmental crimp splice
D. Solder-only splice
Answer: C. Approved environmental crimp splice
, Explanation: Environmental crimp splices provide reliable electrical and
mechanical connections.
7. What should be done before beginning any wiring repair?
A. Start cutting wires.
B. Replace all connectors.
C. De-energize the electrical system.
D. Remove circuit breakers.
Answer: C. De-energize the electrical system.
Explanation: Electrical power must be removed to prevent injury and equipment
damage.
8. Heat-shrink tubing primarily provides:
A. Wire identification only
B. Electrical generation
C. Insulation and environmental protection
D. Increased voltage
Answer: C. Insulation and environmental protection
Explanation: Heat-shrink seals repairs from moisture, abrasion, and
contamination.
9. Which defect requires immediate wire replacement?
A. Slight dust
B. Faded marking
C. Burned insulation with damaged conductor
D. Loose cable tie
Answer: C. Burned insulation with damaged conductor
Explanation: Burn damage can compromise conductor integrity and insulation.
10.What should be used to verify continuity after a repair?
A. Clamp meter
B. Oscilloscope
Newest (2025 - 2026 Update) From Real Past
Papers Questions – A Set Of 100 Most Common
Exam Frequently Tested Questions And Answers In
Details 100% Verified Exam Highly
Recommendable For Grade A+
1. Which document provides the approved method for repairing aircraft
wiring?
A. Aircraft logbook
B. Pilot operating handbook
C. Aircraft Maintenance Manual (AMM)
D. Flight plan
Answer: C. Aircraft Maintenance Manual (AMM)
Explanation: The AMM contains manufacturer-approved wiring repair
procedures and must always be followed.
2. What is the primary purpose of wire identification markings?
A. Increase conductivity
B. Improve flexibility
C. Identify the wire's function and destination
D. Reduce resistance
Answer: C. Identify the wire's function and destination
Explanation: Wire markings allow technicians to correctly identify circuits during
installation and troubleshooting.
3. Which tool is specifically designed for removing insulation without
damaging the conductor?
A. Diagonal cutters
, B. Utility knife
C. Wire stripper
D. Aviation snips
Answer: C. Wire stripper
Explanation: Proper wire strippers remove insulation while protecting conductor
strands.
4. What is the most common conductor material used in aircraft wiring?
A. Aluminum
B. Steel
C. Brass
D. Copper
Answer: D. Copper
Explanation: Copper provides excellent electrical conductivity and mechanical
strength.
5. Why should damaged wire strands never be left after stripping?
A. They improve conductivity.
B. They reduce resistance.
C. They weaken the conductor and reduce current-carrying capacity.
D. They prevent corrosion.
Answer: C. They weaken the conductor and reduce current-carrying capacity.
Explanation: Broken strands increase resistance and reduce mechanical
strength.
6. Which splice is generally preferred for aircraft wire repair?
A. Household twist splice
B. Tape splice
C. Approved environmental crimp splice
D. Solder-only splice
Answer: C. Approved environmental crimp splice
, Explanation: Environmental crimp splices provide reliable electrical and
mechanical connections.
7. What should be done before beginning any wiring repair?
A. Start cutting wires.
B. Replace all connectors.
C. De-energize the electrical system.
D. Remove circuit breakers.
Answer: C. De-energize the electrical system.
Explanation: Electrical power must be removed to prevent injury and equipment
damage.
8. Heat-shrink tubing primarily provides:
A. Wire identification only
B. Electrical generation
C. Insulation and environmental protection
D. Increased voltage
Answer: C. Insulation and environmental protection
Explanation: Heat-shrink seals repairs from moisture, abrasion, and
contamination.
9. Which defect requires immediate wire replacement?
A. Slight dust
B. Faded marking
C. Burned insulation with damaged conductor
D. Loose cable tie
Answer: C. Burned insulation with damaged conductor
Explanation: Burn damage can compromise conductor integrity and insulation.
10.What should be used to verify continuity after a repair?
A. Clamp meter
B. Oscilloscope
