SkyLock MediaPart 107 Prep
Free practice questions

Part 107 practice questions, with answers.

10 questions from the course’s free lessons, with no account needed. Pick your answer, then open the explanation. Every question in the course explains the right answer and why each wrong one is wrong.

  1. Question 1The large blue numbers printed within the latitude and longitude grid squares on a sectional chart represent

    1. the floor of controlled airspace within that quadrangle.
    2. the maximum elevation figure for that quadrangle, in thousands and hundreds of feet MSL.
    3. the magnetic variation applicable within that quadrangle.
    Show answer

    Answer: B. Correct. The maximum elevation figure, or MEF, gives the highest known feature in that quadrangle including terrain and obstructions, expressed in thousands and hundreds of feet MSL. A figure printed as a large 2 with a smaller 5 means 2,500 feet MSL. It is a quick check on what a remote pilot must clear in the area.

    Exam trap: The MEF is MSL and includes obstructions, so it is not the terrain height alone and cannot be read as AGL.

  2. Question 2An obstruction on a sectional chart is annotated with two numbers, the larger one in bold and a smaller one in parentheses beneath it. The number in parentheses is

    1. the height of the obstruction above ground level.
    2. the height of the obstruction above mean sea level.
    3. the year the obstruction was surveyed.
    Show answer

    Answer: A. Correct. Obstruction annotations give the top of the obstruction in feet MSL as the bold figure, with the height above ground level in parentheses. For a remote pilot the parenthetical AGL value is usually the more useful number, since the 400-foot limit in 107.51 is expressed in AGL and the structure exception is measured from the structure's top.

    Exam trap: Both numbers describe the same tower. Bold is MSL, parentheses is AGL, and the AGL figure is what drives the 107.51(b) structure exception.

  3. Question 3An obstruction symbol on a sectional chart shown with a small dot pattern radiating from its base indicates that the obstruction is

    1. under construction.
    2. lighted.
    3. a group of two or more obstructions.
    Show answer

    Answer: B. Correct. Radiating marks around the base of an obstruction symbol indicate that it is lighted. This matters directly to a remote pilot planning night operations, since an unlit tower is far harder to detect and the ACS lists unlit ground hazards as a specific knowledge element.

    Exam trap: Lighting status is charted. An obstruction without the radiating marks should be assumed unlit when planning a night operation.

  4. Question 4A sectional chart is drawn at a scale of 1:500,000. On that chart, one inch represents approximately

    1. 50 nautical miles.
    2. 6.86 nautical miles.
    3. 1 nautical mile.
    Show answer

    Answer: B. Correct. At 1:500,000 one inch on the chart equals 500,000 inches on the ground, which works out to roughly 6.86 nautical miles or about 7.9 statute miles. Rather than calculating, a remote pilot normally measures distance against the scale bars printed in the chart margin.

    Exam trap: Use the printed scale bars rather than arithmetic. Note also that charts show both nautical and statute mile scales, and Part 107 visibility is in statute miles.

  5. Question 5Longitude is measured east and west of the

    1. Prime Meridian, which passes through Greenwich, England.
    2. equator, which divides the northern and southern hemispheres.
    3. International Date Line, in the mid-Pacific Ocean.
    Show answer

    Answer: A. Correct. Longitude is angular distance east or west of the Prime Meridian at Greenwich, and lines of longitude run north to south, converging at the poles. On a sectional the longitude values are labelled along the top and bottom edges.

    Exam trap: Latitude from the equator, read on the side edges. Longitude from Greenwich, read on the top and bottom edges.

  6. Question 6In the METAR group "18004KT", the wind is reported as

    1. from 180 degrees magnetic at 4 knots.
    2. toward 180 degrees at 4 knots.
    3. from 180 degrees true at 4 knots.
    Show answer

    Answer: C. Correct. Wind in a METAR is given as the direction the wind is blowing from, in degrees true, followed by the speed in knots. Note the reference: winds in written reports are true, while winds passed by a controller over the radio are magnetic.

    Exam trap: Two conventions coexist: written reports are true, spoken reports are magnetic. The exam tests the distinction directly.

  7. Question 7A Terminal Aerodrome Forecast (TAF) differs from a METAR in that a TAF

    1. is issued only when conditions fall below instrument minimums.
    2. reports observed conditions across an entire region.
    3. forecasts expected conditions, normally within about 5 statute miles of an airport.
    Show answer

    Answer: C. Correct. A TAF is a forecast covering roughly a 5-statute-mile radius around an airport, normally issued four times daily and valid for 24 or 30 hours. A METAR by contrast reports conditions actually observed at a point in time.

    Exam trap: METAR is what is happening, TAF is what is expected. Both are airport specific rather than regional.

  8. Question 8ASOS and AWOS installations provide a remote pilot with

    1. forecasts of expected weather for the following 24 hours.
    2. continuously updated automated surface weather observations at an airport.
    3. air traffic control clearances into the surrounding airspace.
    Show answer

    Answer: B. Correct. Automated surface observing and weather observing systems generate frequently updated observations of wind, visibility, cloud, temperature, dew point, and altimeter setting. They broadcast on a published frequency and are often available by telephone, making them the most current local source before a flight.

    Exam trap: Automated systems observe conditions at the sensor. They cannot see weather approaching from beyond the airport.

  9. Question 9The primary official source for a preflight weather briefing is

    1. a consumer weather application on a mobile phone.
    2. the airport rotating beacon and windsock.
    3. Flight Service, available online at 1800wxbrief.com or by telephone.
    Show answer

    Answer: C. Correct. Flight Service provides official preflight briefings covering current conditions, forecasts, NOTAMs, and temporary flight restrictions. Because it combines weather with airspace information, it satisfies both the weather and the flight restriction elements of the preflight assessment required by 107.49.

    Exam trap: The official briefing bundles weather with NOTAMs. That pairing is why it satisfies two separate preflight duties at once.

  10. Question 10High density altitude affects a small unmanned aircraft by

    1. having no effect, because electric motors are unaffected by air density.
    2. reducing propeller efficiency and lift, so the aircraft performs more poorly.
    3. increasing propeller efficiency because the air offers less resistance.
    Show answer

    Answer: B. Correct. Density altitude rises with heat, altitude, and humidity. Thinner air means the propeller moves less mass per revolution and the rotors generate less lift, so the aircraft must work harder, draws more current, and suffers reduced payload capacity and endurance.

    Exam trap: Hot, high, and humid all degrade performance. Electric propulsion does not exempt an aircraft from aerodynamics.

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