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FAA Aviation Mechanic Powerplant (AMP) practice questions

335 free questions with answers and explanations.

Practice test
  1. 301.A technician is performing a run-up check on a reciprocating engine and observes that the oil pressure gauge reads zero while the engine is running. The oil temperature gauge is still indicating a normal temperature. Which of the following is the most immediate and critical action the technician should take?Reciprocating Engines
  2. 302.A technician is troubleshooting a reciprocating engine that exhibits consistent backfiring through the carburetor, especially during acceleration. Which of the following is the most likely cause?Reciprocating Engines
  3. 303.A mechanic is performing a pre-flight inspection on a reciprocating engine aircraft. What is the primary reason for draining a small amount of fuel from the fuel tank sumps and fuel strainer drain?Fuel, Induction and Lubrication
  4. 304.A pilot reports that during a flight, the engine's manifold pressure gauge fluctuates erratically, especially at higher power settings. The engine operation feels rough. Which of the following is the most likely cause?Reciprocating Engines
  5. 305.How does the use of a dual ignition system (two spark plugs per cylinder) improve engine reliability and performance in reciprocating aircraft engines?Reciprocating Engines
  6. 306.A technician is inspecting a turbine engine's oil tank pressurization system. If the pressurization valve is found to be stuck open, what effect would this most likely have on the oil system operation at high altitudes?Fuel, Induction and Lubrication
  7. 307.A technician observes that an engine's oil pressure gauge reads zero during initial startup, but then quickly rises to normal operating pressure within a few seconds. Assuming the engine was properly serviced, what is the most likely reason for this initial zero reading?Reciprocating Engines
  8. 308.A mechanic is inspecting the oil dilution system on a reciprocating engine. What is the primary purpose of an oil dilution system?Fuel, Induction and Lubrication
  9. 309.A technician is inspecting the oil system of a reciprocating engine that uses a wet-sump lubrication system. Which of the following is a characteristic of a wet-sump system?Fuel, Induction and Lubrication
  10. 310.A pilot reports that during a cold-weather start, the engine required excessive cranking and then ran very rough for several minutes after starting, eventually smoothing out. Which of the following is the most likely contributing factor to these symptoms?Reciprocating Engines
  11. 311.A mechanic is troubleshooting a continuous-flow fuel injection system on a reciprocating engine. The pilot reports that the engine runs rough at idle and stalls frequently. After checking fuel pressure and flow, the mechanic suspects an issue with the fuel manifold valve (flow divider). What is the most likely symptom of a malfunctioning fuel manifold valve related to this complaint?Fuel, Induction and Lubrication
  12. 312.A mechanic is inspecting the integral fuel tanks of a large transport category aircraft. What is the primary purpose of the surge baffles installed within these tanks?Fuel, Induction and Lubrication
  13. 313.A mechanic is calculating the weight of fuel to be loaded onto an aircraft. The aircraft requires 75 gallons of Jet A fuel. If the specific gravity of Jet A is 0.80, what is the weight of the fuel in pounds? (Assume water weighs 8.35 pounds per gallon).Fuel, Induction and Lubrication
  14. 314.A mechanic is troubleshooting a fuel-injected reciprocating engine that is difficult to start when hot. Which component is most likely contributing to this 'hot start' issue?Fuel, Induction and Lubrication
  15. 315.During a pre-flight inspection, a pilot notices a small amount of oil leaking from the propeller hub on a constant-speed propeller. This oil is most likely originating from which component?Reciprocating Engines
  16. 316.A technician is inspecting a cylinder barrel from a high-hour reciprocating engine. Measurements indicate that the cylinder diameter is largest near the top of the cylinder (combustion end) and gradually tapers towards the crankshaft end. This condition is known as:Reciprocating Engines
  17. 317.A turbine engine is experiencing intermittent compressor stalls, particularly during rapid throttle movements. A mechanic suspects an issue with the fuel control unit. Which aspect of the fuel control unit's operation is most critical in preventing compressor stalls?Fuel, Induction and Lubrication
  18. 318.A pilot reports that during a long descent, the engine oil temperature dropped significantly, causing a noticeable increase in engine friction and reduced oil pressure. What component is likely malfunctioning?Fuel, Induction and Lubrication
  19. 319.A pilot reports that during a rapid power reduction from cruise to idle, the turbine engine experiences a momentary flameout. The mechanic suspects an issue with the fuel control unit. Which component within the FCU is most likely responsible for preventing this condition?Fuel, Induction and Lubrication
  20. 320.A mechanic is troubleshooting a constant-speed propeller system. If the engine oil supply to the propeller dome is interrupted, what is the most likely immediate effect on propeller pitch?Fuel, Induction and Lubrication
  21. 321.An aircraft's engine oil consumption rate is measured at 0.8 quarts per hour. If the oil system has a usable capacity of 12 quarts, how many hours of flight can be safely completed before the oil level reaches the minimum safe operating level, assuming a 2-quart reserve is required?Fuel, Induction and Lubrication
  22. 322.What is the primary function of the oil control rings on a reciprocating engine piston?Reciprocating Engines
  23. 323.A technician is installing new spark plugs in a reciprocating engine. Which of the following is the most critical factor to ensure proper heat transfer and prevent pre-ignition?Reciprocating Engines
  24. 324.A technician is troubleshooting a reciprocating engine that exhibits consistent afterfiring (misfiring and combustion in the exhaust system) during engine shutdown. Which of the following is the most likely cause?Reciprocating Engines
  25. 325.A mechanic is checking the fuel pressure on a reciprocating engine equipped with an engine-driven fuel pump. The manufacturer's specifications call for a normal operating pressure range of 14-17 PSI. If the mechanic observes a sustained fuel pressure of 10 PSI, which of the following is the most likely cause?Fuel, Induction and Lubrication
  26. 326.A mechanic is inspecting the fuel manifold valve (flow divider) on a continuous-flow fuel injection system. What is the primary function of the fuel manifold valve?Fuel, Induction and Lubrication
  27. 327.A mechanic is troubleshooting a capacitance-type fuel quantity indicating system on a turbine aircraft. What is the primary principle of operation for this type of system?Fuel, Induction and Lubrication
  28. 328.A mechanic is checking the idle mixture on a float-type carburetor. If the engine RPM increases significantly and then drops when the mixture control is moved to idle cutoff, what does this indicate?Fuel, Induction and Lubrication
  29. 329.A mechanic is checking the valve operating mechanism on a horizontally opposed engine equipped with hydraulic valve lifters. If the lifter plunger can be depressed more than a slight amount by hand when the engine is cold, what does this most likely indicate?Reciprocating Engines
  30. 330.A mechanic is checking the idle mixture on a float-type carburetor. If, after leaning the mixture control, the engine RPM increases significantly (e.g., 50 RPM or more) before decreasing, what does this indicate?Fuel, Induction and Lubrication
  31. 331.A mechanic is checking the magneto-to-engine timing (external timing) on a reciprocating engine. At what point relative to the piston's travel should the magneto's contact breaker points open to produce a spark for a specific cylinder?Reciprocating Engines
  32. 332.A mechanic is performing a pre-flight inspection on a reciprocating engine aircraft. What is the primary purpose of checking the fuel strainer sump drain?Fuel, Induction and Lubrication
  33. 333.A mechanic is inspecting the fuel tank venting system on an aircraft. What is the primary function of a properly operating fuel tank vent?Fuel, Induction and Lubrication
  34. 334.A technician is performing a magneto internal timing check. The breaker points begin to open at the exact moment the rotating magnet is at its greatest magnetic field strength (E-gap). What is the primary purpose of timing the points to open at this specific position?Reciprocating Engines
  35. 335.A technician is inspecting the exhaust system of a reciprocating engine and finds evidence of hot spots and possible leaks. What is a primary danger associated with exhaust system leaks in proximity to the engine cowling and other components?Reciprocating Engines