100+ Free NCATT AET Practice Questions
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Key Facts: NCATT AET Exam
90 questions
Exam Length
ASTM / SpaceTEC NCATT AET
73%
Passing Score
SpaceTEC Partners (SPI)
5 years
Renewal Cycle
ASTM NCATT (effective Jan 1, 2022)
No prerequisites
Eligibility
ASTM NCATT certification rules
ASTM F46
Governing Standard Committee
ASTM International
0.707
RMS Fraction of Peak (sine wave)
NCATT AET Study Guide
The NCATT AET is the entry credential for aircraft avionics/electronics technicians, administered by SpaceTEC Partners (SPI) through Credential Testing Services for ASTM International's NCATT program. It is a 90-question multiple-choice exam requiring 73% to pass, typically completed in about two hours, with no eligibility prerequisites and a five-year renewal cycle. Content follows the NCATT AET knowledge standards across four sections: introductory/general electronics (DC and AC theory, Ohm's and Kirchhoff's laws, resistors, inductors, capacitors, transformers, diodes, transistors, filters, oscillators, and digital logic/numbering systems), common maintenance practices (hazards, ESD, FOD, hazmat/MSDS, technical publications), fundamentals of on-equipment maintenance (tools, corrosion control, safety wire, aircraft wiring, test equipment), and aircraft fundamentals (structures, flight controls, ground handling). The FAA recognizes the AET as formal training toward a repairman certificate, and it is the gateway exam to NCATT endorsements. The credential remains active in 2026.
Sample NCATT AET Practice Questions
Try these sample questions to test your NCATT AET exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1On the NCATT AET exam, the unit used to express the rate of flow of electrical current is the ampere. One ampere is defined as the flow of how much charge past a point per second?
2Ohm's Law states the current in a circuit is directly proportional to voltage and inversely proportional to resistance. A 28 VDC aircraft bus supplies a load of 14 ohms. What current flows?
3Aircraft storage batteries store energy chemically and deliver it electrically. Most aircraft storage batteries are rated at which nominal DC voltages?
4Kirchhoff's Voltage Law (KVL) is applied when analyzing a series circuit. KVL states that around any closed loop the algebraic sum of which quantity equals zero?
5A technician measures three resistors of 10 ohms each connected in series across a 30 V source. What is the total circuit current?
6In a purely series circuit, which electrical quantity is the same value through every component?
7Voltage drop across a resistor is often called an IR drop. A 5 A current flows through a 4-ohm resistor. What is the voltage drop across it?
8Electrical power in a DC circuit is found by P = E x I. A landing-light circuit draws 8 A at 28 V. How much power does it consume?
9Which subatomic particle is negatively charged and is the carrier involved in the conduction of electricity in a conductor?
10Two 12-ohm resistors are connected in parallel. What is the total resistance of the combination?
About the NCATT AET Exam
The ASTM NCATT Aircraft Electronics Technician (AET) certification validates the foundational knowledge of aerospace avionics and electronics technicians. Built on the ASTM F46 aerospace personnel certification standard and the NCATT AET knowledge standards, the exam covers electronics facts, terminology, and principles, common maintenance practices, fundamentals of on-equipment maintenance, and aircraft fundamentals. The AET is the core (gateway) credential that must be passed before pursuing NCATT endorsement exams, and the FAA recognizes the AET as formal training equivalent toward a repairman certificate. The exam is open to everyone with no prerequisites.
Questions
90 scored questions
Time Limit
Approximately 2 hours
Passing Score
73%
Exam Fee
Approximately $150-$250 (confirm on the current SPI price list) (SpaceTEC Partners, Inc. (SPI) via Credential Testing Services (CTS), under ASTM International / NCATT)
NCATT AET Exam Content Outline
DC Electricity and Circuit Fundamentals
DC basic terms (ampere, volt, ohm, EMF, electron), Ohm's Law (I=E/R) and power (P=EI), series and parallel circuit behavior, Kirchhoff's voltage, current, and resistance laws, voltage drop (IR), and aircraft batteries rated at 12 or 24 volts
AC Electricity
Sine-wave generation, RMS/effective value (0.707 of peak), capacitive reactance (ICE) and inductive reactance (ELI), impedance, resonance when XL equals XC, apparent power in volt-amperes versus true power, power factor, and three-phase polyphase systems
Components and Semiconductors
Resistor color codes and faults, inductors, capacitors and the 63.2% time constant, transformers (step-up/down, eddy current and hysteresis loss), diodes and rectifiers (0.7 V silicon forward bias, bridge), Zener diodes, transistor biasing, relays and switches, frequency-sensitive filters, and oscillators and multivibrators
Digital Techniques
Binary, octal (3-bit triad), and hexadecimal (4-bit) numbering and conversions, bit and byte, main logic gates (AND, OR, NAND, NOR, EXCLUSIVE OR, inverter), positive and negative logic, flip-flops, counters, and seven-segment displays
Maintenance, Safety, and Documentation
Hazards and PPE, ESD control with grounded wrist straps, FOD prevention (Clean As You Go), hazardous materials and MSDS/SDS, the OSHA 90 dB(A) 8-hour noise limit, electrical-shock first aid, multimeter/oscilloscope/ohmmeter use, AC 43.13, the MEL, Airworthiness Directives, and FARs Part 43 and Part 65
Aircraft Fundamentals and Wiring
Aircraft wiring including coaxial, twisted pair, and single-conductor (airframe return), AWG sizing, copper versus aluminum conductors and plating, safety wire sizes, corrosion control, axes of flight and primary flight controls, semimonocoque structures and cantilever wings, Bernoulli lift, towing, and ground handling
How to Pass the NCATT AET Exam
What You Need to Know
- Passing score: 73%
- Exam length: 90 questions
- Time limit: Approximately 2 hours
- Exam fee: Approximately $150-$250 (confirm on the current SPI price list)
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
NCATT AET Study Tips from Top Performers
Frequently Asked Questions
What is the NCATT AET certification?
The ASTM NCATT Aircraft Electronics Technician (AET) is an aerospace personnel certification built on the ASTM F46 standard that validates an avionics/electronics technician's foundational knowledge. It is administered by SpaceTEC Partners through Credential Testing Services and is the gateway credential before NCATT endorsement exams.
How many questions are on the AET exam and what score do I need to pass?
The AET exam has 90 multiple-choice questions and requires a score of 73% to pass. Candidates typically have about two hours to complete it, and there is no limit on the number of retakes, though a fee applies to each attempt.
Are there any prerequisites to take the AET exam?
No. The ASTM NCATT certification exams are open to all individuals regardless of age, career field, training, education, or experience. You must pass the core AET exam before taking any NCATT endorsement exams.
What topics does the AET exam cover?
It covers four NCATT standard sections: introductory/general requirements (DC and AC theory, components, semiconductors, and digital logic), common maintenance practices (hazards, ESD, FOD, hazmat, publications), fundamentals of on-equipment maintenance (tools, corrosion, safety wire, wiring, test equipment), and aircraft fundamentals (structures, flight controls, ground handling).
Does the FAA recognize the AET certification?
Yes. The FAA recognizes the ASTM NCATT AET as formal training equivalent that can count toward a repairman certificate, which is one reason it is valued by avionics employers and military aerospace programs.
How long is the AET certification valid?
ASTM NCATT certifications, including the AET, follow a five-year renewal cycle. Technicians must meet renewal requirements to keep the credential current.