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Definition of a front

Remote Pilot (Part 107) practice question 3 of 25 on Weather / Effects on Performance. ACS element UA.III.B.K1d · difficulty: recall. Want to answer it in a timed quiz? Use the Remote Pilot (Part 107) practice mode.

Question bank updated 2026-09-22

QUESTIONIn meteorology, the zone between two different air masses is called

  1. Aa front
  2. Ban inversion layer
  3. Ca source region
Show the answer and explanation

Correct answer: A. a front

  • A — correct The study guide defines the zone between two different air masses as a frontal zone or front.
  • B — incorrect An inversion is a layer in which temperature rises with altitude; it is not the boundary between two air masses.
  • C — incorrect A source region is where an air mass acquires its properties before it moves out and meets other air masses.

BACKGROUND

As air masses move out of their source regions, they come into contact with other air masses that have different properties. The zone between two different air masses is a frontal zone or front. Across this zone, temperature, humidity and wind often change rapidly over short distances. Passing frontal systems are also one of the common sources of low-level wind shear, so a remote pilot should treat a frontal passage as a period of rapidly changing conditions.

STUDY TIP

Link "front" with "rapid change": temperature, humidity and wind can all shift within a short distance.

KEY POINTS

  • A front is the zone between two different air masses.
  • Temperature, humidity and wind change rapidly across a front.
  • Fronts are a common source of low-level wind shear.

SOURCES

  • remote_pilot_study_guide.txt ch3b "Fronts"
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SkyDrill is not affiliated with the FAA. This is an original practice item based on 14 CFR part 107, 14 CFR part 89, and the FAA Remote Pilot – Small UAS Study Guide (FAA-G-8082-22). Regulations and handbooks are revised; confirm details against the current edition.