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ACARS data link capability

Aviation Mechanic Airframe (AMA) practice question 24 of 26 on Communications, Light Signals, and Runway Lighting Systems. ACS element AM.II.I.K6 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic Airframe (AMA) practice mode.

Question bank updated 2026-09-22

QUESTIONThe Aircraft Communication Addressing and Reporting System (ACARS) provides what capability?

  1. AA satellite voice channel used only for in-flight emergencies.
  2. BA two-way data link between an airliner and the ground.
  3. CA one-way broadcast of position reports to ATC radar.
Show the answer and explanation

Correct answer: B. A two-way data link between an airliner and the ground.

  • A — incorrect ACARS carries data collected by digital sensors and replies from the ground; it is not an emergency-only voice channel.
  • B — correct ACARS is a two-way communication link between an airliner in flight and the airline's main ground facilities.
  • C — incorrect Broadcasting position information outward in one direction describes ADS-B OUT, and ACARS is described as a two-way link.

BACKGROUND

ACARS stands for Aircraft Communication Addressing and Reporting System. It is a two-way communication link between an airliner in flight and the airline's main ground facilities. Data is collected in the aircraft by digital sensors and transmitted to those ground facilities. Replies from the ground may be printed out so the appropriate flight crewmember can have a hard copy of the response. The airline, not air traffic control, is the party at the other end of the link.

STUDY TIP

Fix on two words in the definition: two-way, and airline ground facilities. Both separate ACARS from the surveillance systems it is often confused with.

KEY POINTS

  • ACARS is a two-way link between an airliner in flight and the airline's ground facilities.
  • Digital sensors in the aircraft collect the data that is transmitted.
  • Ground replies can be printed out for the flight crew.

SOURCES

  • ama-airframe/ch11.txt "Aircraft Communication Addressing & Reporting System (ACARS)"
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SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-31B Aviation Maintenance Technician Handbook – Airframe, and 14 CFR part 43. Regulations and handbooks are revised; confirm details against the current edition.