Aircraft Communication Systems Flashcards
Communication systems are the lifeline between the aircraft and the ground, between crew members, and in emergencies. From VHF radios for air traffic control to emergency locator transmitters for crash survival, understanding these systems is essential for modern aviation maintenance.
The FAA Airframe exam covers communication radio types, transponder operation, ELT requirements, intercom systems, and antenna placement. These flashcards cover the components and concepts you need to know.
What You Need to Know
- VHF radio: line-of-sight communication, 118.000–136.975 MHz
- HF radio: long-range (over-the-horizon) communication, 2–30 MHz
- Transponder: replies to ATC radar interrogation with a 4-digit squawk code
- Mode S transponder: includes discrete addressing and altitude reporting
- ADS-B: Automatic Dependent Surveillance-Broadcast for position reporting
- ELT (Emergency Locator Transmitter): transmits on 121.5 and/or 406 MHz
- Intercom: internal crew communication system
- Antennas: VHF (vertical whip), HF (long wire or probe), transponder (L-band)
Why This Topic Appears on FAA Exams
Communication systems are tested because they are critical for air safety. A failed radio or ELT can mean the difference between a safe landing and a disaster. The exam verifies you understand system operation, frequency allocations, and maintenance requirements.
Sample Flashcards
Tap any card to reveal the answer. These are just a sample — the full deck is available inside the study platform.
What frequency range is used for VHF aircraft communication?
What is the purpose of a transponder?
What are the special transponder squawk codes?
What frequencies does an Emergency Locator Transmitter (ELT) use?
Study Tips
Know the frequency ranges: VHF (118–137 MHz, line of sight), HF (2–30 MHz, long range). Remember transponder codes: 1200 (VFR), 7600 (radio failure), 7700 (emergency), 7500 (hijack). Know ELT frequencies: 406 MHz (satellite-monitored, primary) and 121.5 MHz (older, still monitored by some). Understand antenna types and placement.
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Related Topics
Frequently Asked Questions
VHF (Very High Frequency, 118–137 MHz) provides clear, line-of-sight communication limited by the horizon — typically 30–200 miles depending on altitude. HF (High Frequency, 2–30 MHz) uses ionospheric reflection to communicate over the horizon, enabling long-range communication over oceans and remote areas, but with more noise and interference.
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