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FAA Aviation Mechanic General (AMG) practice questions

211 free questions with answers and explanations.

Practice test
  1. 101.During fuel servicing of an aircraft, a technician connects a bonding cable between the fueling truck and the aircraft. What is the primary purpose of this bonding connection?Ground Operations and Servicing
  2. 102.A student mechanic asks why the datum for weight and balance computations on one aircraft is at the nose, while on another it is 100 inches forward of the firewall. What is the correct explanation?Aircraft Drawings, Weight and Balance
  3. 103.An aircraft must be parked overnight on a sloped ramp with the parking brake released for tire pressure equalization. In what order should the wheel chocks be installed to prevent the aircraft from rolling?Ground Operations and Servicing
  4. 104.A technician is safety-wiring two adjacent bolts using the double-twist method. Which practice is correct to ensure the safety wire performs its intended function?Materials, Hardware and Processes
  5. 105.A mechanic is servicing the hydraulic reservoir on a transport aircraft that uses a phosphate ester-based fluid (Skydrol). What is the primary hazard of inadvertently adding a mineral-based hydraulic fluid (MIL-PRF-5606) to this system?Ground Operations and Servicing
  6. 106.A technician completes a major repair on an aircraft and recalculates the empty weight CG at 83.2 inches aft of datum. The type certificate data sheet lists the empty weight CG range as 78.0 to 82.0 inches aft of datum. What action is required before the aircraft can be returned to service?Aircraft Drawings, Weight and Balance
  7. 107.A technician is troubleshooting a hydraulic system where a small piston with an area of 1 square inch has a force of 500 pounds applied to it. This piston is connected through hydraulic fluid to a large piston with an area of 10 square inches. What output force does the large piston produce?Physics, Math and Fluid Lines
  8. 108.A mechanic completes a repair that involved replacing a flight control component that could appreciably change the airplane's flight characteristics. Under 14 CFR 91.407, what must occur before passengers may be carried?Regulations, Records and Human Factors
  9. 109.A technician is fabricating a new fluid line using a standard AN flared fitting. To what angle should the tubing end be flared for proper mating with the fitting?Physics, Math and Fluid Lines
  10. 110.A mechanic needs to perform a nondestructive inspection for surface and near-surface cracks on a steel landing gear axle. Which inspection method magnetizes the part and uses iron particles to reveal defects?Materials, Hardware and Processes
  11. 111.After loading an aircraft, a technician computes a total weight of 3,400 lb and a total moment of 306,000 in-lb. The aircraft's CG envelope specifies a forward limit of 82.0 in and an aft limit of 92.0 in at this weight. Is this loading within limits?Aircraft Drawings, Weight and Balance
  12. 112.A technician recovering a vintage aircraft wing selects Grade A cotton fabric per the original type certificate specification instead of a synthetic polyester fabric such as Ceconite. Compared to synthetic fabric, what is the primary practical disadvantage of Grade A cotton covering?Materials, Hardware and Processes
  13. 113.A mechanic is TIG welding a repair on a 6061-T6 aluminum fuel tank baffle. Which filler rod is most commonly selected for this application?Materials, Hardware and Processes
  14. 114.An A&P mechanic without an Inspection Authorization (IA) has just completed a major repair on a type-certificated airplane using FAA-approved data. According to 14 CFR part 43, who may approve this repair for return to service?Regulations, Records and Human Factors
  15. 115.A 5-pound aluminum engine component (specific heat 0.214 BTU/lb°F) is heated in an oven from 70°F to 220°F for a stress-relief process. How much heat energy, in BTU, is absorbed by the component?Physics, Math and Fluid Lines
  16. 116.A technician must apply 100 in-lb of actual torque to a bolt. A torque wrench 10 inches long is fitted with an extension that adds 2 inches to its effective length, making the total length from the pivot point to the bolt 12 inches. What torque value should the wrench scale be set to in order to achieve the correct actual torque at the bolt?Physics, Math and Fluid Lines
  17. 117.A drive gear with 40 teeth meshes with a driven gear having 10 teeth. If the drive gear rotates at 100 rpm, what is the rotational speed of the driven gear?Physics, Math and Fluid Lines
  18. 118.A mechanic is comparing thread tolerances between an AN aircraft bolt and a commercial-grade bolt of the same size. Aircraft bolts such as AN and MS bolts are typically manufactured to which thread class fit?Materials, Hardware and Processes
  19. 119.An aircraft weighing 4,600 lb has a CG located 92.0 in aft of the datum. A 100 lb baggage item is moved from fuselage station 150 to station 50. What is the new CG location?Aircraft Drawings, Weight and Balance
  20. 120.A technician is studying the SHEL model of human factors to understand why an installation error occurred. The technician determines that the error resulted from following a poorly written, ambiguous checklist step in the maintenance manual. Which component of the SHEL model does this represent?Regulations, Records and Human Factors
  21. 121.During an annual inspection, a mechanic wants to verify that every required inspection area has been covered. Which document defines the scope of items that must be inspected under 14 CFR 91.409 for an annual or 100-hour inspection?Regulations, Records and Human Factors
  22. 122.A 4-pole AC generator rotates at 12,000 RPM. Using the formula frequency (Hz) = (number of poles x RPM) / 120, what output frequency does this generator produce?Fundamentals of Electricity and Electronics
  23. 123.A technician wants to conserve the aircraft battery while performing avionics checks and decides to use a ground power unit (GPU). What is the correct procedure for connecting the GPU to the aircraft?Ground Operations and Servicing
  24. 124.During weighing of a small aircraft, the scale readings and arm distances from the datum are: nose wheel = 900 lb at arm -20 in, left main wheel = 4,550 lb at arm 100 in, right main wheel = 4,550 lb at arm 100 in. What is the aircraft's center of gravity location?Ground Operations and Servicing
  25. 125.Two resistors, 6 ohms and 3 ohms, are connected in parallel across a 12-volt battery. What is the total resistance of the combination?Fundamentals of Electricity and Electronics
  26. 126.A technician suspects internal porosity inside a cast aluminum engine housing that shows no surface indications. Which nondestructive inspection method is best suited to detect this defect?Materials, Hardware and Processes
  27. 127.A ground crew applies a two-step deicing/anti-icing treatment before departure in freezing precipitation: Type I fluid to remove existing ice, followed by Type IV fluid. What is the specific purpose of the Type IV application?Ground Operations and Servicing
  28. 128.A maintenance manual drawing shows a hydraulic actuator with part of its outer housing removed by an imaginary cutting plane, revealing the internal pistons and seals. What type of drawing view is this?Aircraft Drawings, Weight and Balance
  29. 129.A technician is computing the CG of a small aircraft for a weighing report. The basic empty weight is 1,500 lb at an arm of 78.0 in, and the two occupants together weigh 340 lb at an arm of 85.0 in. What is the resulting center of gravity?Aircraft Drawings, Weight and Balance
  30. 130.A technician calibrating an altimeter test set needs to convert standard sea-level atmospheric pressure to inches of mercury. Standard pressure is 14.7 psi, and 1 psi is approximately equal to 2.036 inHg. What is the standard sea-level pressure in inches of mercury?Physics, Math and Fluid Lines
  31. 131.A technician needs to see how the individual detail parts of a landing gear actuator fit together, including part numbers, quantities, and their relative positions, but does not need the detailed dimensions of each individual part. Which type of drawing should the technician consult?Aircraft Drawings, Weight and Balance
  32. 132.At a maintenance facility, mechanics have unofficially stopped applying torque-seal paint on fastener heads even though the shop's written procedures require it, because 'nobody ever checks it.' New hires quickly adopt this shortcut after observing senior technicians. This pattern is an example of which 'Dirty Dozen' factor?Regulations, Records and Human Factors
  33. 133.A technician measures a 4-ohm resistor with 12 volts applied across it. What is the current flowing through the resistor?Fundamentals of Electricity and Electronics
  34. 134.A technician is troubleshooting an aircraft circuit and needs to determine the total resistance of two resistors, 15 ohms and 30 ohms, connected in parallel. Using the product-over-sum method, what is the total resistance?Fundamentals of Electricity and Electronics
  35. 135.An AC voltmeter, which by design reads RMS values, displays 120 volts across a circuit. What is the approximate peak voltage of this AC waveform?Fundamentals of Electricity and Electronics
  36. 136.An A&P mechanic signs a maintenance record indicating a 100-hour inspection was completed, including all required checklist items, although he skipped inspecting the landing gear due to time constraints. This action constitutes a violation of which regulation?Regulations, Records and Human Factors
  37. 137.An aluminum tube 10 feet long at 70°F is heated to 220°F. If the coefficient of linear expansion for aluminum is 0.0000131 inch/inch/°F, how much will the tube elongate?Physics, Math and Fluid Lines
  38. 138.A ramp supervisor wants to reduce the risk of foreign object debris (FOD) damaging engines and tires on the flight line. Which practice is the most effective first line of defense?Ground Operations and Servicing
  39. 139.A technician must form a complex compound bend in a 2024 aluminum bracket without cracking, and plans to heat-treat the part to the required strength after fabrication is complete. Which temper condition should the raw stock be in prior to forming?Materials, Hardware and Processes
  40. 140.A mechanic is completing a new equipment list after installing an avionics upgrade and must update the aircraft's basic empty weight. Which of the following is correctly included in basic empty weight?Aircraft Drawings, Weight and Balance
  41. 141.A gas sample occupies 20 cubic inches at a pressure of 100 psia. If the gas is compressed to a volume of 10 cubic inches at constant temperature, what is the new pressure?Physics, Math and Fluid Lines
  42. 142.A technician moves a bar magnet's north pole toward a stationary closed coil of wire, inducing a current in the coil. According to Lenz's Law, what determines the direction of the induced current?Fundamentals of Electricity and Electronics
  43. 143.While sorting hardware, a technician finds a bolt with two raised dashes stamped on the head. According to standard bolt head marking conventions, this bolt is made of which material and requires what precaution?Materials, Hardware and Processes
  44. 144.A resistor-capacitor (RC) circuit consists of a 100,000-ohm resistor and a 10-microfarad capacitor connected in series to a DC source. How long does it take for the capacitor to reach approximately 63.2 percent of the applied voltage?Fundamentals of Electricity and Electronics
  45. 145.An aircraft has a maximum certificated gross weight of 2,750 lb and a basic empty weight of 1,650 lb after the latest equipment change. What is the aircraft's useful load?Aircraft Drawings, Weight and Balance
  46. 146.A technician performs a Rockwell hardness test on a steel bolt to verify heat treatment. Which principle does this test use to determine hardness?Materials, Hardware and Processes
  47. 147.A technician is washing an aircraft that has magnesium alloy wheels and aluminum skin panels. Which type of cleaning solution should be avoided to prevent accelerated corrosion of these materials?Ground Operations and Servicing
  48. 148.A replacement bracket for a type-certificated aircraft is produced by a manufacturer under a Parts Manufacturer Approval (PMA). What gives this part legal authority for installation on the aircraft?Regulations, Records and Human Factors
  49. 149.A technician installs a different engine model on a certificated aircraft that is not listed as an approved alternate in the Type Certificate Data Sheet, requiring recalculation of the aircraft's weight and balance. This change is classified as a:Regulations, Records and Human Factors
  50. 150.A wiring diagram identifies a connector location as 'BL 24 LH.' What does the 'BL' portion of this designation represent?Aircraft Drawings, Weight and Balance