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FAA Aviation Mechanic Airframe (AMA) practice questions

300 free questions with answers and explanations.

Practice test
  1. 201.A technician installs an ammeter to monitor a 60-amp generator circuit on a 28-volt DC aircraft. Instead of routing full generator current through the meter movement, the technician wires a low-resistance device in series with the load and connects the meter leads across it. What is this device called, and how does it work?Airframe Electrical and Instruments
  2. 202.A technician performing troubleshooting on a variable-displacement engine-driven hydraulic pump measures the case drain flow rate and finds it significantly higher than the value specified in the maintenance manual for a pump at normal operating pressure. What does this excessive case drain flow most likely indicate?Hydraulic and Pneumatic Systems
  3. 203.A Cessna 172 experiences a hard landing during a training flight. Following the manufacturer's maintenance manual guidance for a hard/overweight landing special inspection, which area should the technician primarily inspect for damage?Airframe Inspection
  4. 204.A pitot-static system's static port becomes blocked by ice, and the pilot switches to the alternate static source, which vents into the unpressurized cabin. In this cabin, airflow past unsealed openings creates a slightly lower pressure than outside ambient static pressure. What effect will this have on the altimeter indication?Airframe Electrical and Instruments
  5. 205.A technician is forming 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) x N, what is the bend allowance?Airframe Structures
  6. 206.An engineer designs a wing box using multiple spars, stringers, and skin panels so that if any single structural member completely fails, the remaining structure can still carry the load until the damage is detected during a scheduled inspection. Which structural design philosophy does this describe?Airframe Structures
  7. 207.A technician is comparing two hydraulic filter elements removed from a system for inspection. One is made of pleated paper and is designed to be discarded once contaminated; the other is made of fine stainless steel wire mesh and can be cleaned ultrasonically and reused. These two element types are best described, respectively, as:Hydraulic and Pneumatic Systems
  8. 208.A technician is analyzing a parallel circuit branch containing a 6-ohm resistor and a 12-ohm resistor connected across the same 24-volt bus. What is the total resistance of this parallel combination?Airframe Electrical and Instruments
  9. 209.A technician is troubleshooting a wing leading edge anti-ice system on a turboprop that uses hot bleed air. The pressure regulating and shutoff valve (PRSOV) supplying the piccolo tube fails to close when commanded off. What is the most likely operational consequence?Fuel, Cabin and Ice Control Systems
  10. 210.A technician performs a major repair on the wing skin of a Piper Cherokee involving structural rework beyond the limits of the aircraft's minor repair category. According to 14 CFR Part 43, which form must be completed and a copy submitted to the FAA?Airframe Inspection
  11. 211.A technician is preparing bare aluminum sheet stock prior to painting and applies a chemical bath that produces a thin, gold-to-yellowish iridescent conversion coating on the surface, improving corrosion resistance and paint adhesion without requiring an electrical current. Which process is being performed?Airframe Structures
  12. 212.A technician is identifying bolts during an inventory check and finds a bolt head marked with a single raised dash. According to standard AN bolt head marking conventions, what does this marking indicate?Airframe Structures
  13. 213.A technician is checking main landing gear tire inflation pressure prior to the first flight of the day. For the most accurate pressure reading, the tire should be checked when it isLanding Gear Systems
  14. 214.An engine-driven AC generator has 4 poles and is coupled through a constant-speed drive (CSD) unit that maintains a fixed generator shaft speed regardless of engine RPM fluctuations, in order to produce a steady 400 Hz output. Using the formula frequency = (poles × RPM) / 120, what generator shaft speed must the CSD maintain?Airframe Electrical and Instruments
  15. 215.A remote-indicating fuel quantity system uses a transmitter (rotor) that rotates in proportion to fuel level, electromagnetically coupled to a receiver unit in the cockpit that duplicates the rotor's angular position without a mechanical connection. What type of device provides this remote position-indicating function?Airframe Electrical and Instruments
  16. 216.A technician is explaining the benefit of an angle of attack (AOA) indicator to a pilot compared to relying solely on the airspeed indicator for stall avoidance. Which statement correctly describes why the AOA indicator provides a more reliable stall warning margin?Airframe Electrical and Instruments
  17. 217.A part 135 operator's maintenance manual designates the reassembly of the main landing gear retraction mechanism as a Required Inspection Item (RII). What does this designation mean?Airframe Inspection
  18. 218.A technician is inspecting an onboard inert gas generation system (OBIGGS) installed to reduce the fire hazard in a transport-category aircraft's center wing fuel tank. How does this system reduce the flammability of the fuel tank ullage?Fuel, Cabin and Ice Control Systems
  19. 219.A capacitance-type fuel quantity indicating system uses probes mounted inside the fuel tank. As the fuel level changes, the system determines quantity by measuring a change in which electrical property?Airframe Electrical and Instruments
  20. 220.A technician is troubleshooting a transport-category aircraft's cabin recirculation fan, which is inoperative. What is the primary purpose of this fan within the environmental control system?Fuel, Cabin and Ice Control Systems
  21. 221.A technician notices thread-like corrosion filaments spreading in random directions under the paint finish on an aluminum fuselage skin, most prevalent in a high-humidity environment. This condition is best described as which type of corrosion?Airframe Inspection
  22. 222.A technician is explaining the operation of a Machmeter to a pilot. Inside the instrument, an altitude aneroid capsule senses absolute static pressure while a differential pressure capsule senses the difference between pitot and static pressure. What ratio of these pressures does the Machmeter compute to display Mach number?Airframe Electrical and Instruments
  23. 223.During fuel truck refueling of a transport-category aircraft, a technician connects a bonding cable between the fuel truck and the aircraft before opening the fuel port. What hazard does this bonding procedure primarily prevent?Fuel, Cabin and Ice Control Systems
  24. 224.A technician inspecting a bladder-type fuel cell in a general aviation wing tank finds several small wrinkles in the bladder material after installation. What is the correct course of action?Fuel, Cabin and Ice Control Systems
  25. 225.In a semi-monocoque fuselage structure, which structural members run longitudinally and primarily help distribute bending loads along the fuselage while supporting the skin between frames?Airframe Structures
  26. 226.A technician is preparing an aluminum landing gear strut component for corrosion protection prior to painting. The specified process involves submerging the part in an electrolyte bath and passing an electric current through it, with the part acting as the anode, to build up a hard protective oxide layer on the surface. What process is being performed?Airframe Structures
  27. 227.A mechanic is troubleshooting a reciprocating engine fuel system and locates a gascolator installed at the lowest point of the system between the fuel selector valve and the carburetor. What is the function of this component?Fuel, Cabin and Ice Control Systems
  28. 228.A hydraulic system accumulator is used to dampen pressure surges and provide emergency power for landing gear extension. What is the primary function of the air/nitrogen precharge in a piston-type accumulator?Hydraulic and Pneumatic Systems
  29. 229.An owner asks a technician when the emergency locator transmitter (ELT) battery must be replaced or recharged according to 14 CFR 91.207. Which of the following is correct?Airframe Inspection
  30. 230.A technician is comparing two gyroscopic turn instruments installed in a light twin. One instrument's gimbal is mounted with the gyro spin axis canted approximately 30 degrees from the horizontal. What advantage does this canted mounting provide compared to a standard turn-and-slip indicator?Airframe Electrical and Instruments
  31. 231.A technician is comparing circuit protection devices for a new installation and must explain why fuses are still used in some older aircraft circuits instead of circuit breakers. Which statement correctly describes an advantage of a fuse over a circuit breaker?Airframe Electrical and Instruments
  32. 232.A technician solution heat treats a 2024 aluminum repair skin and, after quenching, allows the part to remain at room temperature for several days before use. During this period, the alloy's strength increases significantly as it reaches its final temper. What is this room-temperature strengthening process called?Airframe Structures
  33. 233.A technician removes a box of 2024-T4 solid rivets from cold storage (icebox) to install in a wing skin repair. Which statement correctly describes how these rivets must be handled?Airframe Structures
  34. 234.A technician is laying out a single row of rivets using 1/8-inch (0.125 in) diameter rivets for a skin splice repair. Using the general rule of a minimum pitch of 6 times the rivet diameter, what is the minimum acceptable spacing between rivet centers?Airframe Structures
  35. 235.During overhaul of a main landing gear shock strut, a technician inspects the pin that allows the strut assembly to pivot in the wing or fuselage attachment fitting during retraction and extension. What is this pivot pin called?Landing Gear Systems
  36. 236.A technician has driven a 1/8-inch (0.125 in) diameter universal head solid rivet. Using the general rule of thumb from AC 43.13-1B that the driven head diameter should be approximately 1.5 times the shank diameter, what is the minimum acceptable driven head diameter?Airframe Structures
  37. 237.A technician examines a fractured steel bolt from a landing gear attachment under magnification and observes a series of smooth, curved concentric lines radiating outward from an origin point near the surface, transitioning into a rough, granular final rupture zone. This fracture surface pattern is most characteristic of which type of failure?Airframe Structures
  38. 238.A DC generator on a twin-engine aircraft fails in flight, causing generator output voltage to drop below battery voltage. Which component automatically opens the circuit between the generator and the bus to prevent the battery from discharging backward through the generator armature?Airframe Electrical and Instruments
  39. 239.A technician troubleshoots a mechanical, float-type fuel quantity indicating system on a light aircraft. The float arm is connected directly to a needle on the cockpit gauge via a mechanical linkage. What is a key limitation of this type of system compared to a capacitance-type system?Fuel, Cabin and Ice Control Systems
  40. 240.A regional jet is forced to attempt an emergency landing shortly after takeoff at a weight well above its maximum structural landing weight. The aircraft is equipped with a fuel jettison system. What is the primary purpose of activating this system before landing?Fuel, Cabin and Ice Control Systems
  41. 241.During an inspection, a technician measures the spacing between support clamps on an unshielded electrical wire bundle routed through the fuselage. According to general aircraft wiring installation practices, wire bundles should typically be supported at intervals not exceeding what maximum spacing?Airframe Electrical and Instruments
  42. 242.A technician finds crushed honeycomb core cells beneath the skin of a composite sandwich panel during a repair. Before bonding a repair patch over the damaged area, what must the technician do to the crushed core?Airframe Structures
  43. 243.A technician repairing a damaged section of wing skin installs an external doubler plate that overlaps the surrounding parent skin on all sides, with rivets installed around the perimeter of the overlap. What type of joint does this repair create?Airframe Structures
  44. 244.A technician is servicing a hydraulic system and must identify the fluid type before adding fluid. The system uses synthetic phosphate ester fluid, which is purple in color. Which seal material must be used with this fluid to prevent seal deterioration?Hydraulic and Pneumatic Systems
  45. 245.On a transport category aircraft with two independent hydraulic systems, a technician learns that one system can be used to power a pump that pressurizes fluid in the other system without any fluid mixing between the two systems. What component performs this function?Hydraulic and Pneumatic Systems
  46. 246.A technician is statically balancing a repaired aileron and determines that 18 inch-pounds of nose-down balancing moment must be added forward of the hinge line to meet the manufacturer's balance requirement. If the balance weight will be installed 3 inches forward of the hinge line, what weight must be added?Airframe Structures
  47. 247.A technician is bench-testing a hydraulic valve removed from an aircraft. Testing shows the valve allows full, unrestricted flow in one direction but completely blocks flow in the opposite direction, with no flow at all permitted in reverse. Which component has the technician most likely identified?Hydraulic and Pneumatic Systems
  48. 248.A mechanic is briefing an apprentice on the purpose of the electric fuel boost pump located inside a fuel tank. What is the primary function of this pump?Fuel, Cabin and Ice Control Systems
  49. 249.A technician examining a semi-monocoque fuselage section identifies a heavy longitudinal structural member that runs the full length of the fuselage, attaches to the bulkheads, and has a much larger cross-sectional area than the surrounding stiffeners. What is this member called?Airframe Structures
  50. 250.A technician needs to inspect a steel landing gear component for surface cracks. Which NDT method relies on magnetizing the part and applying iron particles that cluster at flux leakage points?Airframe Inspection