Practice Test Geeks(AET) Aircraft Electronics Technician Practice Test
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Electrical Troubleshooting Flashcards

7 cards from real AET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Electrical Troubleshooting flashcards as text

  1. When troubleshooting an intermittent open circuit in an aircraft wiring harness, which method is most effective?

    Answer: Wiggle test while monitoring continuity with an ohmmeter

    A wiggle test while monitoring continuity helps isolate intermittent opens caused by broken conductors or poor connections that only fail under movement.

  2. An aircraft circuit breaker trips immediately upon reset. The FIRST troubleshooting step should be to:

    Answer: Disconnect loads progressively to find the fault

    Progressively disconnecting loads isolates the faulty component causing the overcurrent condition before replacing the breaker.

  3. A voltage drop test across a switch shows 1.8 volts while the circuit is operating. This indicates:

    Answer: High resistance in the switch contacts

    Excessive voltage drop across a closed switch indicates high contact resistance due to corrosion, pitting, or wear.

  4. Which instrument is used to measure insulation resistance between an aircraft wire and its shield or conduit?

    Answer: Megohmmeter (megger)

    A megohmmeter applies high voltage to reveal insulation degradation that a standard ohmmeter cannot detect.

  5. During troubleshooting, a technician measures 28V at one side of a load but 0V at the other side with the circuit energized. This indicates:

    Answer: The load has an open circuit

    Full supply voltage appearing across an open load (with 0V on the return side) confirms the load element is open and blocking current flow.

  6. An aircraft bus bar shows 26V on one side and 24V on the other side under load. The technician should suspect:

    Answer: A high-resistance connection or corroded bus bar

    A 2V drop across a bus bar indicates a high-resistance fault such as corrosion, loose hardware, or oxidation at the connection point.

  7. When using a logic probe to troubleshoot an aircraft digital avionics circuit, a rapidly flashing LED indicates:

    Answer: A pulsing or toggling signal

    A rapidly flashing logic probe LED indicates the test point is receiving a pulsing or toggling digital signal rather than a static HIGH or LOW.