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FAA Aviation Mechanic General (AMG) practice questions

211 free questions with answers and explanations.

Practice test
  1. 1.A mechanic holding an Inspection Authorization (IA) has performed at least one annual inspection during the preceding 24 months and wants to renew the IA without taking a written test. According to 14 CFR 65.91, when does an Inspection Authorization normally expire if not renewed?Regulations, Records and Human Factors
  2. 2.A spherical hydraulic accumulator has an internal diameter of 6 inches. Using the formula V = (4/3)πr³, what is the approximate internal volume of the accumulator?Physics, Math and Fluid Lines
  3. 3.A technician is reviewing a material specification sheet for a landing gear bolt marked SAE 4130. What does the "41" designate in this steel numbering system?Materials, Hardware and Processes
  4. 4.During a shift change, a technician who had partially disassembled an inspection panel leaves without verbally briefing the incoming shift or documenting the panel's status. The next technician, unaware, closes the panel believing the work is complete. This incident is a classic example of which Dirty Dozen human factor?Regulations, Records and Human Factors
  5. 5.A technician measures a coil with an inductance of 0.5 henry connected to a 60 Hz AC power source. What is the inductive reactance of the coil?Fundamentals of Electricity and Electronics
  6. 6.A maintenance drawing lists a component's location as 'FS 210.' What does this designation indicate?Aircraft Drawings, Weight and Balance
  7. 7.On a detail drawing of a long wing spar, a middle portion of the part is omitted to conserve drawing space, shown using a jagged or S-shaped break line, while both remaining ends retain their true dimensions and features. What is this line called?Aircraft Drawings, Weight and Balance
  8. 8.An aircraft's AC electrical system operates at a frequency of 400 Hz. What is the period of one complete cycle of this AC waveform?Fundamentals of Electricity and Electronics
  9. 9.A technician needs an absolute temperature value in degrees Rankine for a gas law calculation. The shop thermometer reads 68°F. What is this temperature in degrees Rankine?Physics, Math and Fluid Lines
  10. 10.A technician has performed the same 50-hour inspection on the same model of engine hundreds of times and begins to skip verifying torque values because 'it's always been fine before.' This attitude is an example of which human factors hazard from the 'Dirty Dozen'?Regulations, Records and Human Factors
  11. 11.A circuit contains three resistors of 10, 20, and 30 ohms connected in series to a battery. What is the total resistance of the circuit?Fundamentals of Electricity and Electronics
  12. 12.A mechanic needs to verify the approved propeller models that may be installed with a specific engine on a certificated aircraft. Which document should the mechanic consult?Regulations, Records and Human Factors
  13. 13.A technician is laying out a row of 1/8-inch (0.125 in) diameter universal head rivets along the edge of a 0.040-inch aluminum skin panel. Per standard sheet metal practice, what is the minimum acceptable edge distance from the center of the rivet hole to the edge of the sheet?Materials, Hardware and Processes
  14. 14.A technician tests an AC circuit and reads 100 volts on the voltmeter, 5 amps on the ammeter, and 300 watts on the wattmeter. What is the power factor of this circuit?Fundamentals of Electricity and Electronics
  15. 15.A technician must fabricate a 90-degree bend in a piece of 0.032-inch aluminum sheet using a bend radius of 0.125 inch. Using the standard bend allowance formula BA = (0.01743R + 0.0078T) × N, what is the bend allowance?Materials, Hardware and Processes
  16. 16.According to the left-hand rule for generators (based on electron flow theory), a conductor moves upward through a magnetic field with flux lines pointing to the right. Using the thumb for motion and forefinger for field direction, what does the middle finger indicate?Fundamentals of Electricity and Electronics
  17. 17.A two-stage gear reduction drive consists of a 60-tooth drive gear meshing with a 20-tooth gear on the intermediate shaft, which also carries a 40-tooth gear meshing with a final 20-tooth output gear. If the input shaft rotates at 1,800 RPM, what is the output shaft speed?Physics, Math and Fluid Lines
  18. 18.A technician moves a wire loop rapidly through a magnetic field. According to Faraday's Law of electromagnetic induction, the magnitude of the induced EMF in the loop is directly proportional to what factor?Fundamentals of Electricity and Electronics
  19. 19.A technician is safety-wiring a fuel fitting when a coworker interrupts to ask an unrelated question about a parts order. The technician answers, then resumes the safety-wiring task without rechecking the torque or wire routing already completed, resulting in an incomplete installation. This scenario best illustrates which of the 'Dirty Dozen' human factors?Regulations, Records and Human Factors
  20. 20.A technician performs a liquid penetrant inspection on a suspect crankshaft. After removing excess penetrant from the surface, the technician skips directly to inspection under white light without applying the next required step. What is the most likely consequence?Materials, Hardware and Processes
  21. 21.A technician is selecting material for an exhaust shroud that must resist very high operating temperatures, offer excellent corrosion resistance, and provide a strength-to-weight ratio superior to stainless steel. Which material would best meet these requirements?Materials, Hardware and Processes
  22. 22.A technician installs a semiconductor diode in a power supply circuit to convert alternating current into pulsating direct current. This process is known as:Fundamentals of Electricity and Electronics
  23. 23.A technician cadmium-plates a high-strength steel bolt with an ultimate tensile strength over 220,000 psi. What critical process must be performed after plating to prevent structural failure?Materials, Hardware and Processes
  24. 24.A technician installs a 20 lb avionics unit at fuselage station 150 (arm = 150 inches aft of datum) during a weight and balance revision. What moment does this installation add to the aircraft's total moment?Aircraft Drawings, Weight and Balance
  25. 25.A technician is selecting rivets to repair a stressed skin panel and finds a rivet with a raised dot stamped on the manufactured head. This head marking identifies the rivet as which alloy, and what special handling does it require?Materials, Hardware and Processes
  26. 26.A technician selects an AN fluid line fitting marked with a dash number of '-6.' Based on standard AN numbering, what is the approximate tubing outside diameter?Physics, Math and Fluid Lines
  27. 27.A mechanic is torquing a bolt through an aluminum fitting and installs an AN960 flat washer under the nut before final torque. What is the primary purpose of this washer?Materials, Hardware and Processes
  28. 28.A technician must prepare 5 gallons of cleaning solution using a concentrate that must make up 25% of the total mixture, with the remainder being water. How many gallons of concentrate are needed?Physics, Math and Fluid Lines
  29. 29.A rectangular hydraulic fluid tank measures 24 inches long, 18 inches wide, and 12 inches deep. Approximately how many gallons does the tank hold when full (1 cubic foot = 7.48 gallons)?Physics, Math and Fluid Lines
  30. 30.A confined gas in a rigid, sealed hydraulic accumulator has a pressure of 50 psia at a temperature of 60°F. If the container cannot expand and the gas is heated to 160°F, what is the new pressure (assume constant volume)?Physics, Math and Fluid Lines
  31. 31.A technician has worked four consecutive 16-hour shifts to meet an aircraft's return-to-service deadline. On the final shift, he forgets to torque a critical fitting, resulting in a discrepancy found during a post-maintenance inspection. Which Dirty Dozen factor most directly contributed to this error?Regulations, Records and Human Factors
  32. 32.A technician needs to know exactly how many rivets of a specific part number are required to complete a wing skin assembly shown on an engineering drawing. Which part of the drawing provides this information?Aircraft Drawings, Weight and Balance
  33. 33.A technician must perform an engine ground run-up on a turbine-powered transport aircraft. To avoid personnel being ingested or injured, which hazard area is of GREATEST concern directly in front of and close to the engine intake during high power settings?Ground Operations and Servicing
  34. 34.A mechanic holds an Airframe rating only, without a Powerplant rating. According to 14 CFR 65.81, which action may this mechanic legally perform and approve for return to service?Regulations, Records and Human Factors
  35. 35.Two technicians are each assigned to service opposite wings of an aircraft but never confer on the work being done. As a result, both technicians assume the other checked the flap rigging, and it is never verified. Which Dirty Dozen factor caused this gap?Regulations, Records and Human Factors
  36. 36.A technician is using an aircraft maintenance manual's zone chart to locate a wiring harness. On this chart, zone number 300 is designated for a specific major structural area. Which area does zone 300 typically represent?Aircraft Drawings, Weight and Balance
  37. 37.A repair station technician is performing scheduled maintenance on a cargo door that was installed under a Supplemental Type Certificate (STC). The STC holder has published Instructions for Continued Airworthiness (ICA) for the modification. According to 14 CFR 43.16, what is the technician required to do?Regulations, Records and Human Factors
  38. 38.A mechanic is installing an AN bolt through a fitting requiring a grip length of 0.75 inch, but the shortest available bolt with that shank diameter has a grip length of 0.625 inch. What is the correct procedure to complete this installation?Materials, Hardware and Processes
  39. 39.During a borescope inspection of an engine component, a technician finds corrosion that has attacked along the metal's grain boundaries with little surface pitting visible, weakening the material internally. Which type of corrosion is this?Materials, Hardware and Processes
  40. 40.A mechanic performs a required 100-hour inspection on a Part 91 aircraft used for flight instruction and finds it airworthy. According to 14 CFR 43.11, which entry is required in the maintenance record?Regulations, Records and Human Factors
  41. 41.A technician forms a 90-degree bend in a piece of 0.040-inch 2024-T3 aluminum sheet using a bend radius smaller than the specified minimum bend radius for that thickness and alloy. What is the most likely result?Materials, Hardware and Processes
  42. 42.A mechanic needs to order a bolt for a critical structural application requiring closer manufacturing tolerances and higher strength than a standard AN bolt provides. Which specification system should the mechanic select?Materials, Hardware and Processes
  43. 43.A technician explains conventional current flow theory to an apprentice. According to this theory, current flows through the external part of a circuit in which direction?Fundamentals of Electricity and Electronics
  44. 44.A mechanic is calculating when the next 100-hour inspection is due. According to 14 CFR 1.1, 'time in service' for this purpose is defined as the time:Regulations, Records and Human Factors
  45. 45.A mechanic needs to detect a small surface crack in a nonferrous aluminum wing skin without removing paint or disassembling the structure. Which inspection method uses induced electrical currents to detect this type of flaw?Materials, Hardware and Processes
  46. 46.During a turbine engine start attempt, the engine fails to reach a self-sustaining RPM and fuel is shut off, resulting in a hung/aborted start. Before attempting another start, the mechanic performs a dry motoring run using the starter with fuel and ignition OFF. What is the purpose of this step?Ground Operations and Servicing
  47. 47.An engineering drawing specifies a hole diameter as 0.250 +0.005/–0.000 inch. What does this tolerance callout mean?Aircraft Drawings, Weight and Balance
  48. 48.A step-down transformer has a primary winding with 100 turns and a secondary winding with 20 turns. If 120 volts AC is applied to the primary, what voltage is induced in the secondary winding?Fundamentals of Electricity and Electronics
  49. 49.A fire breaks out in an aircraft's electrical bay due to a short circuit while the aircraft is on battery power during ground maintenance. Which type of fire extinguisher should the technician use?Ground Operations and Servicing
  50. 50.An aircraft is being jacked in a maintenance hangar for landing gear retraction tests. Before raising the aircraft, the technician must verify which condition to ensure a safe jacking operation?Ground Operations and Servicing