ASTM NCATT Aircraft Electronics Installation Technician
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Real Past Papers Questions – A Set Of 100 Most
Common Exam Frequently Tested Questions And
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Recommendable For Grade A+
1. Which document provides the approved instructions for installing aircraft
equipment?
A. Maintenance logbook
B. Aircraft flight manual
C. Supplemental Type Certificate (STC) or approved installation data
D. Weight and balance sheet
Explanation: Approved installation data such as an STC, engineering order, or
manufacturer instructions must be followed when installing aircraft equipment.
2. Before beginning an avionics installation, the technician should first:
A. Remove the old wiring
B. Install new circuit breakers
C. Review all approved installation instructions and drawings
D. Perform a functional test
Explanation: Reviewing installation documentation ensures the installation
complies with approved engineering data.
3. Wire routing should avoid:
A. Existing wire bundles
,B. Equipment racks
C. Moving flight control components
D. Terminal blocks
Explanation: Wiring must be protected from moving controls to prevent chafing
and possible system failure.
4. Aircraft wiring should normally be supported at intervals not exceeding:
A. 48 inches
B. 36 inches
C. 24 inches
D. 60 inches
Explanation: Aircraft wiring is generally supported every 24 inches or less to
minimize vibration damage.
5. What is the primary purpose of strain relief?
A. Improve conductivity
B. Reduce voltage
C. Prevent mechanical stress on connectors
D. Increase shielding
Explanation: Proper strain relief protects wire terminations from vibration and
pulling forces.
6. Which connector feature prevents incorrect mating?
A. Shield clamp
B. Heat shrink
C. Keying arrangement
D. Lockwasher
, Explanation: Connector keying ensures connectors can only be assembled in the
correct orientation.
7. Shielded wire is primarily used to reduce:
A. Resistance
B. Voltage drop
C. Electromagnetic interference
D. Current flow
Explanation: Shielding minimizes electromagnetic interference affecting sensitive
avionics.
8. The preferred method for terminating shield drains is:
A. Twist with power wire
B. Solder directly to structure
C. Terminate according to installation instructions using approved grounding
methods
D. Cut the shield away completely
Explanation: Shield termination methods are specified by approved installation
instructions.
9. Coaxial cable is commonly used for:
A. Power distribution
B. Cabin lighting
C. RF signal transmission
D. Battery charging
Explanation: Coaxial cable carries radio frequency signals while maintaining
impedance.
10.Excessive bending of coaxial cable may result in:
(AEIT) Endorsement 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 instructions for installing aircraft
equipment?
A. Maintenance logbook
B. Aircraft flight manual
C. Supplemental Type Certificate (STC) or approved installation data
D. Weight and balance sheet
Explanation: Approved installation data such as an STC, engineering order, or
manufacturer instructions must be followed when installing aircraft equipment.
2. Before beginning an avionics installation, the technician should first:
A. Remove the old wiring
B. Install new circuit breakers
C. Review all approved installation instructions and drawings
D. Perform a functional test
Explanation: Reviewing installation documentation ensures the installation
complies with approved engineering data.
3. Wire routing should avoid:
A. Existing wire bundles
,B. Equipment racks
C. Moving flight control components
D. Terminal blocks
Explanation: Wiring must be protected from moving controls to prevent chafing
and possible system failure.
4. Aircraft wiring should normally be supported at intervals not exceeding:
A. 48 inches
B. 36 inches
C. 24 inches
D. 60 inches
Explanation: Aircraft wiring is generally supported every 24 inches or less to
minimize vibration damage.
5. What is the primary purpose of strain relief?
A. Improve conductivity
B. Reduce voltage
C. Prevent mechanical stress on connectors
D. Increase shielding
Explanation: Proper strain relief protects wire terminations from vibration and
pulling forces.
6. Which connector feature prevents incorrect mating?
A. Shield clamp
B. Heat shrink
C. Keying arrangement
D. Lockwasher
, Explanation: Connector keying ensures connectors can only be assembled in the
correct orientation.
7. Shielded wire is primarily used to reduce:
A. Resistance
B. Voltage drop
C. Electromagnetic interference
D. Current flow
Explanation: Shielding minimizes electromagnetic interference affecting sensitive
avionics.
8. The preferred method for terminating shield drains is:
A. Twist with power wire
B. Solder directly to structure
C. Terminate according to installation instructions using approved grounding
methods
D. Cut the shield away completely
Explanation: Shield termination methods are specified by approved installation
instructions.
9. Coaxial cable is commonly used for:
A. Power distribution
B. Cabin lighting
C. RF signal transmission
D. Battery charging
Explanation: Coaxial cable carries radio frequency signals while maintaining
impedance.
10.Excessive bending of coaxial cable may result in:
