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AEA Certified Aircraft Electronics Technician (CAET)

Practice Questions100 questions

Exam Review

Key Facts: NCATT AET Exam

90 questions

Exam Length

ASTM / SpaceTEC NCATT AET

73%

Passing Score

SpaceTEC Partners (SPI)

$175

Current AET Price

SpaceTEC purchase page

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 a 90-question multiple-choice exam requiring 73% to pass, with about two hours allowed and no eligibility prerequisites. Its official study guide lists four sections and 34 standard areas but does not publish percentage weights. Under the FAA pathway cited by ASTM, the AET must be paired with at least one eligible NCATT endorsement to serve as the relevant formal-training equivalent for 14 CFR 65.101(a)(5)(ii).

Sample NCATT AET Practice Questions

Try these sample questions to review concepts for the NCATT AET exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 126+ 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?

A.One coulomb

B.One volt

C.One ohm

D.One watt

Explanation: One ampere is a rate of flow of one coulomb (about 6.28 x 10^18 electrons) passing a given point in a circuit each second; in equations current is the letter I.

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?

A.2 A

B.0.5 A

C.14 A

D.392 A

Explanation: By Ohm's Law I = E / R = 28 V / 14 ohms = 2 A. One volt causes one ampere to flow through one ohm.

3Aircraft storage batteries store energy chemically and deliver it electrically. Most aircraft storage batteries are rated at which nominal DC voltages?

A.12 or 24 volts

B.6 or 9 volts

C.48 or 110 volts

D.115 or 200 volts

Explanation: Aircraft storage batteries are generally rated at 12 or 24 volts and are built of primary or secondary cells connected in series to obtain the desired DC voltage.

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?

A.The voltages

B.The currents

C.The resistances

D.The capacitances

Explanation: KVL states the algebraic sum of all voltages around a closed loop is zero; the sum of the voltage drops equals the applied voltage.

5A technician measures three resistors of 10 ohms each connected in series across a 30 V source. What is the total circuit current?

A.1 A

B.0.33 A

C.3 A

D.9 A

Explanation: By KRL the series resistance totals 10 + 10 + 10 = 30 ohms, so I = E / R = 30 V / 30 ohms = 1 A.

6In a purely series circuit, which electrical quantity is the same value through every component?

A.Current

B.Voltage

C.Resistance

D.Power

Explanation: A series circuit has only one path, so current is common (identical) through all components; voltage divides among the resistances.

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?

A.1.25 V

B.9 V

C.20 V

D.100 V

Explanation: Voltage drop equals current times resistance (E = I x R) = 5 A x 4 ohms = 20 V, the IR drop.

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?

A.3.5 W

B.20 W

C.36 W

D.224 W

Explanation: Power equals voltage times current: P = 28 V x 8 A = 224 W.

9Which subatomic particle is negatively charged and is the carrier involved in the conduction of electricity in a conductor?

A.Proton

B.Neutron

C.Electron

D.Positron

Explanation: Electrons are negatively charged particles orbiting the nucleus and are the carriers involved in the conduction of electricity.

10Two 12-ohm resistors are connected in parallel. What is the total resistance of the combination?

A.6 ohms

B.3 ohms

C.12 ohms

D.24 ohms

Explanation: For two equal parallel resistors the total equals one value divided by two: 12 / 2 = 6 ohms. Parallel resistance is always less than the smallest branch.

About the NCATT AET Exam

The ASTM NCATT Aircraft Electronics Technician (AET) certification validates foundational aerospace electronics knowledge. ASTM publishes a 90-question exam with a 73% passing score and open eligibility. The SpaceTEC-hosted 2012 study guide organizes review material into four broad sections, but it is not a current weighted blueprint. The AET is required before NCATT endorsement exams.

Exam sponsor: SpaceTEC Partners, Inc. (SPI) via Credential Testing Services (CTS), under ASTM International / NCATT. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

90 questions

Time Limit

Not published by ASTM or SpaceTEC on the current public AET pages

Passing Score

73%

Exam / Certification Fees

$175

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Not published

Section A — General Requirements

Introductory and general electronics knowledge areas

Not published

Section B — Common Maintenance Practices

Hazards, ESD, FOD, and technical publications

Not published

Section C — On-Equipment Maintenance

Tools, corrosion control, safety wire, aircraft wiring, and test equipment

Not published

Section D — Aircraft Fundamentals

Aircraft fundamentals and ground handling

Preparing for the NCATT AET Exam

What You Need to Know

Passing score: 73%
Exam length: 90 questions
Time limit: Not published by ASTM or SpaceTEC on the current public AET pages
Exam / certification fees: $175 Official sources

Using Our Practice Resources

Work through all 126 available questions
Review every answer and explanation
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NCATT AET: Suggested Study Strategy

1Memorize Ohm's Law (I=E/R) and the power formula (P=EI), then practice series totals with Kirchhoff's resistance law and parallel combinations until calculations are automatic

2Lock in the AC memory aids ELI and ICE: in an inductor voltage leads current, in a capacitor current leads voltage, and recall that RMS equals 0.707 of peak

3Drill the resistor color code (black 0, brown 1, red 2, orange 3, yellow 4, green 5, blue 6, violet 7, gray 8, white 9) and the 0.7 V silicon diode forward-bias value

4Practice binary, octal (3-bit triad), and hexadecimal (4-bit) conversions and the truth tables for AND, OR, NAND, NOR, and EXCLUSIVE OR gates

5Know the safety and documentation specifics: grounded ESD wrist strap, OSHA 90 dB(A) 8-hour noise limit, when to consult AC 43.13, the MEL under Part 91.213, and that Part 43 covers maintenance while Part 65 covers airman privileges

6Review aircraft wiring rules (0.020-inch safety wire for connectors, AWG numbers rise as wire gets smaller, copper outperforms aluminum in conductivity) and the three axes of flight with their matching primary controls

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 questions and requires 73% to pass. ASTM's current public page does not publish a time limit. Retakes are unlimited, with another exam fee due each time.

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?

ASTM reports that the FAA pathway requires the AET plus at least one eligible NCATT endorsement to serve as the relevant formal-training equivalent under 14 CFR 65.101(a)(5)(ii). The AET alone should not be described as satisfying that pathway.

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.