Practice Test Geeks(AET) Aircraft Electronics Technician Practice Test
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Technical Knowledge and Skills 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 Technical Knowledge and Skills flashcards as text

  1. HF radio communication in aviation typically operates in which frequency range?

    Answer: 2–30 MHz

    HF (High Frequency) communication systems operate between 2 and 30 MHz, providing long-range voice and data communication via ionospheric skip propagation.

  2. Under FAA regulations, who is authorized to approve avionics maintenance work for return to service on a certificated aircraft?

    Answer: An FAA-certificated repairman with appropriate ratings or an A&P mechanic with IA

    Return-to-service approval for avionics maintenance requires a certificated repairman with appropriate ratings or an Airframe & Powerplant mechanic holding an Inspection Authorization (IA).

  3. An ELT (Emergency Locator Transmitter) certified to TSO-C126 transmits on which frequency?

    Answer: 406 MHz and 121.5 MHz

    TSO-C126 406 MHz ELTs transmit a digital distress signal on 406 MHz for satellite detection and a homing signal on 121.5 MHz for local search-and-rescue crews.

  4. ACARS (Aircraft Communications Addressing and Reporting System) primarily uses which communication medium for airborne data link?

    Answer: VHF Data Link (VDL) or SATCOM

    ACARS uses VHF Data Link (typically 129.125 MHz and others) for short-range digital messaging and SATCOM for oceanic areas beyond VHF coverage.

  5. An airborne weather radar system operating in X-band operates at approximately:

    Answer: 9.3–9.5 GHz

    Airborne weather radar X-band systems operate at approximately 9.3–9.5 GHz, which provides good precipitation detection while keeping antenna size manageable.

  6. TCAS II issues Resolution Advisories (RAs) by coordinating with the intruder aircraft via:

    Answer: Mode S data link at 1030/1090 MHz

    TCAS II units coordinate complementary RAs between aircraft using the Mode S transponder data link on 1030 MHz (interrogation) and 1090 MHz (reply) frequencies.

  7. When using a spectrum analyzer to measure a VHF COM transmitter output, a technician observes harmonic spurs 40 dB below the fundamental. This result is:

    Answer: Within typical acceptable limits for airborne transmitters

    Harmonic suppression of 40 dB or more below the fundamental is typically within acceptable limits per FCC and RTCA standards for airborne VHF transmitters.