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Exam Review

Key Facts: NCAA AME Avionics Exam

60 Q

Official Exam Questions

NCAA Syllabus

120 Min

Exam Duration

NCAA Regulations

75%

Minimum Passing Score

Nig. CARs Part 2

~N50,000

Official Exam Fee

NCAA Schedule of Fees

400 Hz

Aircraft AC Standard Frequency

Avionics Standard

ARINC 429

Dominant Avionics Bus Standard

Avionics Specification

NCAA AME Avionics is a 60-question, 120-minute CBT exam with a 75% pass threshold, testing aircraft electrical calculations, avionics systems, and Nig. CARs regulations.

Sample NCAA AME Avionics Practice Questions

Try these sample questions to review concepts for the NCAA AME Avionics exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1An aircraft DC circuit powered by a 28 V DC bus draws a constant current of 4.0 amperes. According to Ohm's Law, what is the total resistance of the circuit load?
A.7.0 Ohms
B.112.0 Ohms
C.0.14 Ohms
D.14.0 Ohms
Explanation: Using Ohm's Law ($R = V / I$), dividing 28 V by 4.0 A yields a circuit resistance of 7.0 Ohms.
2What is the standard frequency of main AC electrical power generation in modern commercial aircraft?
A.400 Hz
B.50 Hz
C.60 Hz
D.1000 Hz
Explanation: Modern aircraft AC systems standardize on 400 Hz because higher frequency permits significantly smaller and lighter transformers and generators compared to 50/60 Hz ground systems.
3What is the primary function of a Transformer-Rectifier Unit (TRU) in an aircraft electrical system?
A.Step down 115 V AC power and convert it into 28 V DC power
B.Convert 28 V DC battery power into 115 V AC 400 Hz power
C.Regulate the output voltage of the main engine-driven AC generator
D.Isolate essential avionics buses during engine start
Explanation: A Transformer-Rectifier Unit (TRU) steps down 115 V AC 400 Hz three-phase power using a transformer and rectifies it into 28 V DC power to power DC avionics and charge batteries.
4Which flight instrument receives input EXCLUSIVELY from the static pressure port of the pitot-static system?
A.Altimeter and Vertical Speed Indicator (VSI)
B.Airspeed Indicator (ASI)
C.Machmeter
D.Turn and Slip Indicator
Explanation: The sensitive Altimeter and the Vertical Speed Indicator (VSI) use ambient static pressure exclusively to determine altitude and rate of climb/descent, whereas the ASI requires both pitot (ram) pressure and static pressure.
5What is the main purpose of equipping an aircraft pitot tube with an internal electrical heating element?
A.Prevent ice formation from blocking the ram air inlet during flight in icing conditions
B.Heat static pressure lines to prevent water vapor condensation
C.Maintain calibrated airspeed sensor temperature at a constant value for digital conversion
D.Prevent thermal expansion of the pitot tube housing at high speed
Explanation: Pitot heaters use resistive heating elements operated from 28 V DC or 115 V AC to prevent ice build-up that would block the ram air entry hole and corrupt airspeed indications.
6What is the designated frequency band allocated for civil aviation VHF voice communication transceivers?
A.118.000 MHz to 136.975 MHz
B.108.000 MHz to 117.950 MHz
C.225.000 MHz to 399.950 MHz
D.2.000 MHz to 29.999 MHz
Explanation: Civil aviation VHF communication transceivers operate in the frequency range of 118.000 MHz to 136.975 MHz with 25 kHz or 8.33 kHz channel spacing.
7Which frequency band is allocated for V-O-R (VHF Omnidirectional Range) navigation stations?
A.108.00 MHz to 117.95 MHz
B.118.00 MHz to 136.975 MHz
C.962 MHz to 1213 MHz
D.190 kHz to 535 kHz
Explanation: VOR ground navigation stations operate within the VHF frequency band between 108.00 MHz and 117.95 MHz (with 108.00 - 111.95 MHz shared with ILS localizer on even-tenth decimals).
8What is the primary function of vent plugs on aircraft lead-acid or nickel-cadmium storage batteries?
A.Safely vent hydrogen and oxygen gases produced during charging while keeping electrolyte contained
B.Allow manual addition of concentrated sulfuric acid during routine maintenance
C.Provide pressure relief during high-altitude rapid decompression only
D.Drain excess electrolyte into the battery sump compartment
Explanation: During battery charging, electrolysis splits water into hydrogen and oxygen gases. Vent plugs feature flame-arresting porous caps that allow gas venting while preventing electrolyte spillage and flame flashback.
9In digital logic circuits, what is the output state of a standard 2-input A-N-D gate when Input A is HIGH (1) and Input B is LOW (0)?
A.LOW (0)
B.HIGH (1)
C.Pulsing at 400 Hz
D.High Impedance (Tri-state)
Explanation: An AND gate produces a HIGH (1) output ONLY when ALL of its inputs are HIGH (1). If any input is LOW (0), the output remains LOW (0).
10Why are static discharge wicks installed on the trailing edges of aircraft wingtips and control surfaces?
A.Bleed off accumulated precipitation static charge into the air to reduce radio interference
B.Provide electrical bonding paths across control surface hinges
C.Act as lightning strike dissipators to prevent structural melting
D.Generate localized turbulence to delay air separation over flight controls
Explanation: As aircraft fly through clouds, rain, or dust, friction creates static electrical charges. Static dischargers feature fine fibers or sharp points that discharge static continuously at low voltage levels, preventing high-voltage spark noise that disrupts VHF/HF radio reception.

About the NCAA AME Avionics Exam

The NCAA Aircraft Maintenance Engineer Licence - Avionics/Electrical certification examination tests candidate knowledge of Nig. CARs Part 2 & Part 5, aircraft AC/DC generation, power distribution, instruments, radio navigation, communication systems, autoflight, radar, digital logic, and EWIS wiring standards.

Exam sponsor: Nigeria Civil Aviation Authority (NCAA). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

60 MCQs: Electrical Systems & Calculations (25%), Instruments (20%), Radio Nav/Comm (20%), Autoflight/Radar (15%), and EWIS & Nig. CARs (20%).

Time Limit

120 minutes

Passing Score

75%

Exam / Certification Fees

₦20,000

Exam sponsor website

Reported exam pass rate: 60-70%. Varies by candidate preparation level and approved training organization. This describes exam candidates, not OpenExamPrep users or results from using our resources. Exam sponsor website

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

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.

25%

Aircraft Electrical Systems & Calculations

AC/DC generation, power distribution, battery systems, TRUs, inverters, and circuit calculations (Ohm's law, AC impedance, power factor).

20%

Instrument Systems & Air Data

Pitot-static systems, altimeters, airspeed/vertical speed indicators, gyroscopic flight instruments, EFIS, and AHRS.

20%

Radio Navigation & Communications

VOR, ILS, DME, ADF/NDB, GNSS/GPS navigation, and VHF/HF communication transceivers.

15%

Autoflight & Radar Systems

Autopilot control loops, flight director, yaw damper, weather radar, radio altimeters, and Mode S transponders/TCAS.

20%

Digital Logic, EWIS & Nig. CARs Regulations

Digital data buses (ARINC 429), logic gates, Electrical Wiring Interconnection Systems (EWIS), bonding/shielding, and Nig. CARs Part 2 & Part 5 rules.

Preparing for the NCAA AME Avionics Exam

What You Need to Know

  • Passing score: 75%
  • Assessment: 60 MCQs: Electrical Systems & Calculations (25%), Instruments (20%), Radio Nav/Comm (20%), Autoflight/Radar (15%), and EWIS & Nig. CARs (20%).
  • Time limit: 120 minutes
  • Exam / certification fees: ₦20,000 Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NCAA AME Avionics: Suggested Study Strategy

1Master fundamental electrical formulas: Ohm's law, power equations, series/parallel resistance, inductive/capacitive reactance, and power factor.
2Thoroughly study Nig. CARs Part 2 (Licensing requirements and privileges) and Part 5 (Airworthiness requirements and Certificate of Release to Service).
3Understand pitot-static system errors, alternate static source operation, and gyroscopic principles (rigidity in space and precession).
4Learn signal characteristics and frequency bands for VOR (VHF), ILS (VHF/UHF), DME (UHF), ADF (LF/MF), and VHF/HF communications.
5Review ARINC 429 data word structure, parity bits, logic gate truth tables, and EWIS wiring inspection/separation standards.
6Practice multi-step calculation items under timed conditions (2 minutes per question).

Frequently Asked Questions

What authority regulates the NCAA AME Avionics examination in Nigeria?

The examination is administered by the Nigeria Civil Aviation Authority (NCAA) under the regulatory framework of Nigeria Civil Aviation Regulations (Nig. CARs) Part 2 (Personnel Licensing) and Part 5 (Airworthiness).

What is the passing score and format for the NCAA AME Avionics exam?

The exam consists of 60 multiple-choice questions administered via CBT over 120 minutes. Candidates must score at least 75% to achieve a pass grade.

What categories of avionics systems are tested?

The syllabus includes aircraft AC/DC power generation and electrical calculations, flight instruments and air data, radio navigation (VOR/ILS/DME/GNSS), communications (VHF/HF), autoflight/radar, digital logic, EWIS wiring practices, and Nig. CARs licensing rules.

Are electrical circuit calculations included in the examination?

Yes. Candidates are required to perform calculations involving Ohm's law, series/parallel resistance, AC capacitive/inductive reactance, transformer turn ratios, power factor, and battery capacity.

What privileges does an NCAA AME Avionics licence confer under Nig. CARs?

It grants the licence holder the privilege to issue a Certificate of Release to Service (CRS) following maintenance, overhaul, or modification of aircraft avionics, electrical, instrument, radio, and auto-flight systems within their approved ratings.