AMG
General
239 questions
- 44 from the sample questions the FAA published in 2021
- 195 from question sets the FAA published from 2008 to 2014
- 12 ACS topic areas
Practice exam 60 questions · 2 hours · 70% to pass
FAA Aviation Mechanic knowledge tests
Every answer explained, with its FAA source.
Practice for the General, Airframe and Powerplant tests. Pick an answer and see why it is right, why the other choices are wrong, and the sentence from the FAA handbook it comes from, with document and page.
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Powerplant · Turbine Engines
AM.III.B.K4
Published by the FAA in 2021. The current test may differ.
What is the first engine instrument indication of a successful start of a turbine engine?
- A rise in engine rpm.
- A rise in oil temperature.
- Correct answer: A rise in the exhaust gas temperature.
Correct
Why C is correct. The starter is already turning the engine, so the first sign that fuel has lit off in the combustor is a rise in exhaust gas temperature. The EGT must then be watched closely to catch a hot start.
Reference
“A successful start is noted first by a rise in exhaust gas temperature.”
1,091practice questions across the three tests
39ACS topic areas to practice by
98%of answers quote an FAA source. The rest cite an FAA figure.
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Three tests
General, Airframe
and Powerplant.
The FAA published these questions as sample or study material. Answers and explanations are ours. The current test may differ.
AMA
Airframe
440 questions
- 78 from the sample questions the FAA published in 2021
- 362 from question sets the FAA published from 2006 to 2014
- 14 ACS topic areas
Practice exam 100 questions · 2 hours · 70% to pass
AMP
Powerplant
412 questions
- 66 from the sample questions the FAA published in 2021
- 346 from question sets the FAA published from 2006 to 2014
- 13 ACS topic areas
Practice exam 100 questions · 2 hours · 70% to pass
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Topics follow the Aviation Mechanic Airman Certification Standards. 39 topic areas across the three tests.
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General · Fundamentals of Electricity and ElectronicsAM.I.A.K2
Published by the FAA in 2021. The current test may differ.
Through which material will magnetic lines of force pass the most readily?
Why B is correct. Iron is ferromagnetic and has a very high permeability (low reluctance), so magnetic lines of force pass through it far more easily than through air or nonmagnetic metals.
Why A is wrong. Copper is nonmagnetic with a permeability of about one, like air, so it offers no easy path for flux.
Why C is wrong. Aluminum is nonmagnetic with a permeability of about one, so it offers no easy path for flux.
Reference
“Materials such as soft iron and other ferrous metals are said to have a high permeability, the measure of the ease with which magnetic flux can penetrate a material.”
“The term ferromagnetic is applied to iron and its alloys, which have by far the greatest permeability.”
Airframe · Non-Metallic StructuresAM.II.B.K18
Published by the FAA in 2021. The current test may differ.
When conducting a tap test on a composite panel, which of the following sounds would indicate delamination?
Why B is correct. In a tap (coin tap) test, a well-bonded solid area gives a clear, sharp ringing sound. A delaminated or disbonded area sounds dull, like a thud.
Why A is wrong. A clear, sharp ringing sound indicates a well-bonded, solid structure, not a delamination.
Why C is wrong. "Sharp thud" is not the sound described for a defect; the defect response is a dull, thud-like sound, while a sharp sound means a good bond.
Reference
“A clear, sharp, ringing sound is indicative of a well-bonded solid structure, while a dull or thud-like sound indicates a discrepant area.”
“A surprisingly accurate method in the hands of experienced personnel, tap testing is perhaps the most common technique used for the detection of delamination and/or disbond.”
Powerplant · Engine Instrument SystemsAM.III.D.K2
Published by the FAA in 2021. The current test may differ.
Turbine engine EGT thermocouples are constructed of
Why C is correct. Turbine EGT thermocouples must survive very high exhaust temperatures, so they are made of chromel and alumel. Iron-constantan and copper-constantan are lower-temperature pairs used for cylinder head temperature (CHT) measurement.
Why A is wrong. Iron and constantan is a common pair for reciprocating-engine CHT measurement, not for turbine EGT.
Why B is wrong. Copper and constantan is also used for CHT measurement and cannot handle turbine exhaust temperatures.
Reference
“Iron and constantan, or copper and constantan, are common for CHT measurement. Chromel and alumel are used for turbine EGT thermocouples.”
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