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FAA Aviation Maintenance Technician General Knowledge Test Practice Test

The FAA Aviation Maintenance Technician General Knowledge Test (AMG) practice page addresses foundational maintenance knowledge, including electrical components, material properties, safe work practices, and handling aircraft parts. Its questions also touch on documentation and basic metalworking procedures, such as filing and deburring. These topics connect routine shop actions with protecting aircraft, components, and maintenance personnel.

Exam overview

Exam providerFederal Aviation Administration
Exam codeAMG
CategoryAviation

About the FAA Aviation Maintenance Technician General Knowledge Test Exam

The sampled questions focus on applying basic principles during maintenance rather than identifying aircraft-specific systems. Electrical concepts include circuit-breaker protection, battery isolation before work that could create a short, and transformer function in an AC circuit. Material and tool questions address ferromagnetism and controlled filing. Safety scenarios ask why loose-object control and stable aircraft support matter during work. Other items connect maintenance practice to records and component traceability: logbook entries document completed work, while tags identify a removed part and record its condition before evaluation or repair. When answering, distinguish the purpose of a precaution or procedure from the action itself, and consider how it prevents injury, equipment damage, or loss of maintenance information. The bank's examples indicate these areas of practice but do not establish official topic coverage.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

Which property makes a material ferromagnetic?

  1. AIt conducts electricity only when heated
  2. BIt is strongly attracted to a magnet
  3. CIt resists all chemical corrosion
  4. DIt becomes transparent under pressure
Show answerCorrect answer: B

Ferromagnetic materials, such as many iron-based materials, are strongly attracted to magnets and can be magnetized. This property is useful in identifying certain materials but does not determine their corrosion resistance.

Question 2

Why should an aircraft be protected from loose objects and debris during maintenance?

  1. ATo prevent foreign objects from causing damage, obstruction, or injury
  2. BTo make all components electrically insulated
  3. CTo prevent normal temperature changes in the structure
  4. DTo eliminate the need for a post-maintenance inspection
Show answerCorrect answer: A

Foreign objects can obstruct controls or passages, damage components, and injure personnel. Good housekeeping and inspection help ensure tools and debris are accounted for before operation.

Question 3

Why should a drilled hole in a metal part be deburred before the part is installed, when the applicable procedure permits it?

  1. ATo remove sharp edges that can initiate cracks or damage adjacent parts
  2. BTo increase the hole diameter beyond its specified size
  3. CTo make the part electrically nonconductive
  4. DTo replace the need for inspecting the hole
Show answerCorrect answer: A

Deburring removes sharp edges that can concentrate stress, create crack-initiation sites, or damage contacting components. It must be done without enlarging the hole beyond limits, and inspection is still needed.

Question 4

What is the primary function of a circuit breaker in an electrical system?

  1. ATo interrupt current when it exceeds a designed limit
  2. BTo increase voltage during normal operation
  3. CTo store electrical energy for later use
  4. DTo convert alternating current into direct current
Show answerCorrect answer: A

A circuit breaker opens a circuit when current exceeds its protective rating, helping limit damage from overloads or faults. It is not a voltage converter or energy-storage device.

Question 5

Why is a properly supported aircraft important before a technician works beneath it?

  1. AIt prevents the aircraft from settling or moving unexpectedly
  2. BIt increases tire pressure evenly
  3. CIt prevents fuel from evaporating
  4. DIt keeps control cables at their maximum tension
Show answerCorrect answer: A

Correct support and suitable stands help prevent aircraft movement or collapse, reducing the risk of injury and damage while work is performed underneath.

Question 6

Why should an aircraft battery be disconnected before work that could short an electrical circuit?

  1. ATo reduce the risk of unintended current flow and electrical damage
  2. BTo increase battery capacity during maintenance
  3. CTo make circuit resistance measurements more accurate while powered
  4. DTo prevent the aircraft from accumulating static charge
Show answerCorrect answer: A

Disconnecting the battery when appropriate isolates a source of electrical power and helps prevent accidental shorts, arcing, damage, or injury. The applicable maintenance instructions should be followed for the specific aircraft and task.

Question 7

When using a file on a metal part, which practice helps produce a controlled cut and protect the file teeth?

  1. AApply cutting pressure on the forward stroke and ease pressure on the return stroke
  2. BApply heavy pressure equally on both strokes
  3. CUse the file as a pry bar when the cut is nearly complete
  4. DHold the file by its teeth to improve control
Show answerCorrect answer: A

A hand file is generally designed to cut on the forward stroke. Relieving pressure on the return stroke reduces unnecessary wear and helps the user control material removal.

How to use this practice test

Access is free. The bank contains 50 published questions; each practice session presents up to 20 random questions and shows results afterward. Use a session to check whether you can explain the purpose behind electrical precautions, safe handling, and maintenance documentation, then revisit any concepts you missed.

Preparation tips

  • For circuit-protection questions, distinguish a circuit breaker's response to excessive current from a component's normal operating function.
  • Practice explaining why a battery may need to be disconnected before work that could create an unintended conductive path or short circuit.
  • Review safe metalworking concepts such as controlled filing and deburring, including how these practices affect the part and the work area.
  • Connect maintenance records and component tags to their purposes: documenting completed work and preserving identity and condition during evaluation or repair.
  • For safety scenarios, identify the hazard addressed by securing the aircraft and controlling loose objects before maintenance begins.
Official sourceOfficial exam page ↗