ASTM NCATT Avionics Installation Practices
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1. Before beginning an avionics installation, the technician should first:
A. Install the equipment
B. Review the approved installation data
C. Perform an engine run
D. Remove existing wiring
Answer: B. Review the approved installation data
Explanation: Approved installation data ensures the installation complies with
certification and safety requirements.
2. What is the primary purpose of an aircraft bonding jumper?
A. Increase voltage
B. Reduce current
C. Maintain electrical continuity between components
D. Support equipment weight
Answer: C. Maintain electrical continuity between components
,Explanation: Bonding jumpers provide a low-resistance electrical path that
minimizes static electricity and fault currents.
3. A torque wrench is primarily used to:
A. Measure voltage
B. Tighten hardware to a specified value
C. Cut safety wire
D. Strip insulation
Answer: B. Tighten hardware to a specified value
Explanation: Correct torque prevents loose fasteners and avoids damage caused
by overtightening.
4. Which document specifies acceptable methods, techniques, and practices
for aircraft maintenance?
A. Pilot Operating Handbook
B. Wiring Diagram Manual
C. AC 43.13
D. Flight Manual
Answer: C. AC 43.13
Explanation: AC 43.13 provides industry-accepted methods when manufacturer-
approved procedures are unavailable.
5. Shielded wire is primarily used to:
A. Increase current capacity
B. Reduce electromagnetic interference
C. Improve flexibility
D. Lower voltage
,Answer: B. Reduce electromagnetic interference
Explanation: Shielding protects sensitive circuits from electrical noise.
6. Wire identification markings should normally be:
A. Removed after installation
B. Painted over
C. Visible for maintenance
D. Hidden inside bundles
Answer: C. Visible for maintenance
Explanation: Proper identification simplifies troubleshooting and maintenance.
7. A grommet is installed in a hole primarily to:
A. Improve cooling
B. Prevent wire chafing
C. Increase conductivity
D. Secure connectors
Answer: B. Prevent wire chafing
Explanation: Grommets protect wires from damage where they pass through
structure.
8. When routing wire bundles, they should be:
A. Supported at approved intervals
B. Left unsupported
C. Wrapped around hydraulic lines
D. Installed under tension
Answer: A. Supported at approved intervals
, Explanation: Proper support minimizes vibration damage.
9. Which connector pin is usually installed first?
A. Damaged pin
B. Largest available pin
C. Correct pin specified by the connector manufacturer
D. Spare pin
Answer: C. Correct pin specified by the connector manufacturer
Explanation: Using the specified contact ensures compatibility and reliability.
10.Coaxial cable is commonly used for:
A. Hydraulic systems
B. RF signal transmission
C. Fuel transfer
D. Static wicks
Answer: B. RF signal transmission
Explanation: Coaxial cable maintains signal integrity for radio-frequency systems.
11.Heat-shrink tubing is primarily used to:
A. Increase voltage
B. Protect and insulate wire splices
C. Lubricate connectors
D. Measure resistance
Answer: B. Protect and insulate wire splices
Explanation: Heat-shrink tubing provides insulation and strain relief.
12.Proper strain relief prevents:
Assessment 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. Before beginning an avionics installation, the technician should first:
A. Install the equipment
B. Review the approved installation data
C. Perform an engine run
D. Remove existing wiring
Answer: B. Review the approved installation data
Explanation: Approved installation data ensures the installation complies with
certification and safety requirements.
2. What is the primary purpose of an aircraft bonding jumper?
A. Increase voltage
B. Reduce current
C. Maintain electrical continuity between components
D. Support equipment weight
Answer: C. Maintain electrical continuity between components
,Explanation: Bonding jumpers provide a low-resistance electrical path that
minimizes static electricity and fault currents.
3. A torque wrench is primarily used to:
A. Measure voltage
B. Tighten hardware to a specified value
C. Cut safety wire
D. Strip insulation
Answer: B. Tighten hardware to a specified value
Explanation: Correct torque prevents loose fasteners and avoids damage caused
by overtightening.
4. Which document specifies acceptable methods, techniques, and practices
for aircraft maintenance?
A. Pilot Operating Handbook
B. Wiring Diagram Manual
C. AC 43.13
D. Flight Manual
Answer: C. AC 43.13
Explanation: AC 43.13 provides industry-accepted methods when manufacturer-
approved procedures are unavailable.
5. Shielded wire is primarily used to:
A. Increase current capacity
B. Reduce electromagnetic interference
C. Improve flexibility
D. Lower voltage
,Answer: B. Reduce electromagnetic interference
Explanation: Shielding protects sensitive circuits from electrical noise.
6. Wire identification markings should normally be:
A. Removed after installation
B. Painted over
C. Visible for maintenance
D. Hidden inside bundles
Answer: C. Visible for maintenance
Explanation: Proper identification simplifies troubleshooting and maintenance.
7. A grommet is installed in a hole primarily to:
A. Improve cooling
B. Prevent wire chafing
C. Increase conductivity
D. Secure connectors
Answer: B. Prevent wire chafing
Explanation: Grommets protect wires from damage where they pass through
structure.
8. When routing wire bundles, they should be:
A. Supported at approved intervals
B. Left unsupported
C. Wrapped around hydraulic lines
D. Installed under tension
Answer: A. Supported at approved intervals
, Explanation: Proper support minimizes vibration damage.
9. Which connector pin is usually installed first?
A. Damaged pin
B. Largest available pin
C. Correct pin specified by the connector manufacturer
D. Spare pin
Answer: C. Correct pin specified by the connector manufacturer
Explanation: Using the specified contact ensures compatibility and reliability.
10.Coaxial cable is commonly used for:
A. Hydraulic systems
B. RF signal transmission
C. Fuel transfer
D. Static wicks
Answer: B. RF signal transmission
Explanation: Coaxial cable maintains signal integrity for radio-frequency systems.
11.Heat-shrink tubing is primarily used to:
A. Increase voltage
B. Protect and insulate wire splices
C. Lubricate connectors
D. Measure resistance
Answer: B. Protect and insulate wire splices
Explanation: Heat-shrink tubing provides insulation and strain relief.
12.Proper strain relief prevents:
