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FAA Part 107 sUAS Recurrent (ALC-677) study materials
FAA Part 107 sUAS Recurrent (ALC-677) study resources

FAA Part 107 sUAS Recurrent (ALC-677) practice questions

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Question 1Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

Under Part 107, what is the maximum groundspeed allowed for a small unmanned aircraft?

  1. 87 knots Correct answer.
  2. 100 mph
  3. 120 knots
  4. 100 knots

Explanation

Part 107 limits small unmanned aircraft to a maximum groundspeed of 87 knots (100 mph). This limit applies regardless of altitude or airspace class.

Question 2Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

Unless a waiver is held, what is the standard maximum altitude for small UAS operations under Part 107?

  1. 400 feet AGL Correct answer.
  2. 400 feet MSL
  3. 1,200 feet AGL
  4. 500 feet AGL

Explanation

Part 107 sets a standard ceiling of 400 feet above ground level, with an exception allowing flight within 400 feet of a structure when operating near it. The limit is measured above ground level, not mean sea level.

Question 3Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

What minimum visual line of sight must the remote pilot in command maintain with the small unmanned aircraft?

  1. Line of sight maintained by a visual observer only
  2. Unaided visual line of sight at all times Correct answer.
  3. Aided line of sight using binoculars is acceptable
  4. Line of sight through a first-person-view camera

Explanation

The remote pilot in command must maintain unaided visual line of sight with the aircraft at all times. Corrective lenses are permitted, but magnification devices such as binoculars are not.

Question 4Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

What is the minimum age to hold a remote pilot certificate with a small UAS rating?

  1. 21 years
  2. 18 years
  3. 16 years Correct answer.
  4. 14 years

Explanation

An applicant must be at least 16 years old to obtain a remote pilot certificate with a small UAS rating. There is no upper age limit, but recurrent training is required.

Question 5Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

How often must a remote pilot in command complete recurrent training to keep their privileges current?

  1. Every 6 calendar months
  2. Every 12 calendar months
  3. Every 36 calendar months
  4. Every 24 calendar months Correct answer.

Explanation

Recurrent training must be completed within the preceding 24 calendar months to maintain currency. A knowledge test may be taken instead of the training.

Question 6Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

A remote pilot is operating a 35-pound sUAS for a commercial survey. Which operating rule applies?

  1. Part 107 does not apply because the aircraft exceeds 25 pounds
  2. Part 103 applies because the aircraft is unmanned
  3. Part 91 applies because the operation is commercial
  4. Part 107 applies because the aircraft weighs less than 55 pounds Correct answer.

Explanation

Part 107 governs small unmanned aircraft weighing less than 55 pounds at takeoff, including commercial operations. Weight, not the commercial nature of the flight, determines applicability.

Question 7Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

A remote pilot wants to fly at night. What is required under Part 107?

  1. Operations at night are prohibited without exception
  2. No additional equipment is needed if the pilot has prior night experience
  3. Anti-collision lighting visible for at least 3 statute miles and, if a waiver is used, specific conditions Correct answer.
  4. Only a waiver is required in all cases

Explanation

Night operations require anti-collision lighting visible for at least 3 statute miles, and the remote pilot must complete required training or hold a waiver with conditions. Night flight is permitted when these requirements are met.

Question 8Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

What is the maximum permissible weight of a small unmanned aircraft under Part 107, including everything onboard or attached?

  1. 55 pounds Correct answer.
  2. 25 pounds
  3. 75 pounds
  4. 50 pounds

Explanation

A small unmanned aircraft must weigh less than 55 pounds at takeoff, including all equipment and payload. This threshold defines eligibility for Part 107 operations.

Question 9Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

A remote pilot plans to operate in Class B airspace. What authorization is required?

  1. A waiver from the FAA is always required
  2. Notification to the nearest airport is sufficient
  3. No authorization is needed below 400 feet AGL
  4. An ATC authorization obtained before flight Correct answer.

Explanation

Operations in Class B, C, D, and surface-area Class E airspace require prior air traffic control authorization. This authorization must be obtained before the flight begins.

Question 10Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

A person who has never held a remote pilot certificate wants to operate commercially. What must they do first?

  1. Complete recurrent training online
  2. Obtain a waiver for all operations
  3. Pass the initial aeronautical knowledge test and obtain a remote pilot certificate Correct answer.
  4. Register the aircraft and begin flying immediately

Explanation

A first-time applicant must pass the initial aeronautical knowledge test to obtain a remote pilot certificate with a small UAS rating. Recurrent training applies to pilots who already hold the certificate.

Question 11Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

What is the minimum distance a small UAS must remain from clouds when operating under Part 107?

  1. 500 feet below and 1,000 feet horizontally
  2. 500 feet below and 2,000 feet horizontally Correct answer.
  3. 200 feet below and 2,000 feet horizontally
  4. 100 feet below and 1,000 feet horizontally

Explanation

Part 107 requires at least 500 feet below clouds and 2,000 feet horizontally from clouds. These cloud clearance requirements support see-and-avoid separation from manned aircraft.

Question 12Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

A remote pilot is asked to carry a package for a customer. Under the standard Part 107 operating rules, what limitation applies to carrying property for compensation?

  1. Carriage of property for compensation is prohibited without a waiver or operating certificate Correct answer.
  2. Property may be carried if the total weight stays under 55 pounds
  3. Property may be carried if the pilot maintains line of sight
  4. Property may be carried only at night

Explanation

The standard Part 107 operating rules prohibit carrying property for compensation or hire. Such operations require a waiver or a separate operating certificate issued by the FAA.

Question 13Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

A remote pilot operating under Part 107 sees a manned helicopter approaching. What is the pilot's responsibility?

  1. Contact the helicopter by radio to request it alter course
  2. Maintain the current course because the sUAS has the right of way
  3. Yield the right of way and take action to avoid the aircraft Correct answer.
  4. Climb to a higher altitude to increase separation

Explanation

The remote pilot must yield the right of way to all manned aircraft and must not pass over, under, or ahead of them unless well clear. The sUAS operator bears the see-and-avoid responsibility.

Question 14Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

A remote pilot holds a current remote pilot certificate but has not completed recurrent training within the last 26 months. What is the status of their privileges?

  1. Privileges are automatically revoked permanently
  2. Privileges lapse until recurrent training or a knowledge test is completed Correct answer.
  3. Privileges remain valid because the certificate does not expire
  4. Privileges remain valid if the aircraft is registered

Explanation

A remote pilot must complete recurrent training within the preceding 24 calendar months to keep operating privileges current. If currency lapses, the pilot cannot exercise privileges until the training or knowledge test is completed.

Question 15Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

A remote pilot wants to operate an sUAS at 700 feet AGL near a 1,000-foot-tall tower. Under what condition may this be permitted without a waiver?

  1. The pilot notifies ATC and climbs above 400 feet
  2. The aircraft remains within 100 feet of the tower
  3. The aircraft remains within 400 feet of the tower and is operated within its lateral footprint Correct answer.
  4. The aircraft stays below 400 feet AGL at all times

Explanation

Part 107 allows flight above 400 feet AGL when the aircraft is within 400 feet of a structure and operated within its lateral footprint. The higher altitude is permitted only in proximity to the structure.

Question 16Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

A remote pilot is operating in Class G airspace and plans to fly at 300 feet AGL. Which statement best describes the authorization requirement?

  1. A waiver is required for all Class G operations
  2. Authorization is required only if the aircraft weighs more than 25 pounds
  3. No ATC authorization is required in Class G airspace under the standard rules Correct answer.
  4. Prior ATC authorization is required because the flight is above 200 feet

Explanation

Class G airspace is uncontrolled, so prior ATC authorization is not required for operations there under the standard Part 107 rules. Other limits, such as the 400-foot ceiling and cloud clearance, still apply.

Question 17Applicable regulations relating to small unmanned aircraft system rating privileges, limitations, and flight operation

A remote pilot is hired to inspect a roof and wants to fly directly over people who are not involved in the operation. Under the standard Part 107 rules, what is the general restriction?

  1. Flight over people is permitted if the aircraft weighs less than 25 pounds
  2. Flight over people is permitted at any altitude above 100 feet
  3. Flight over people is permitted if a visual observer is present
  4. Flight over people is generally prohibited unless the operation meets specific category requirements or a waiver is held Correct answer.

Explanation

The standard rules generally prohibit operating over people who are not directly participating, unless the operation satisfies the applicable category requirements or a waiver is granted. Weight alone does not authorize flight over people.

Question 18Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

What is the standard maximum altitude above ground level for small UAS operations under Part 107 unless a exception applies?

  1. 400 feet Correct answer.
  2. 250 feet
  3. 1,200 feet
  4. 500 feet

Explanation

Part 107 sets a default ceiling of 400 feet AGL. Higher altitudes are permitted only when the aircraft is flown within a 400-foot radius of a structure and does not exceed 400 feet above the structure's uppermost limit.

Question 19Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

A remote pilot wants to fly at 700 feet AGL next to a 600-foot-tall radio tower. Under Part 107, what is the highest altitude permitted in this situation?

  1. 700 feet AGL
  2. 600 feet AGL
  3. 1,000 feet AGL Correct answer.
  4. 400 feet AGL

Explanation

When operating within a 400-foot radius of a structure, the sUAS may fly up to 400 feet above the structure's uppermost limit. Adding 400 feet to the 600-foot tower yields a ceiling of 1,000 feet AGL.

Question 20Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

What is the minimum visibility required for small UAS operations under Part 107?

  1. 3 statute miles Correct answer.
  2. 5 statute miles
  3. 2 nautical miles
  4. 1 statute mile

Explanation

Part 107 requires at least 3 statute miles of flight visibility from the control station. Visibility is measured from where the remote pilot is located, not from some other point.

Question 21Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

Under Part 107, what minimum distance must a small UAS maintain below clouds?

  1. 1,000 feet below
  2. 2,000 feet below
  3. 200 feet below
  4. 500 feet below Correct answer.

Explanation

The remote pilot must keep the aircraft at least 500 feet below clouds and 2,000 feet horizontally from them while maintaining 3 statute miles visibility. These cloud clearance minima apply to all Part 107 operations.

Question 22Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

A small UAS is being flown in Class G airspace at 300 feet AGL, 4 statute miles from a nontowered airport. Which statement accurately describes the cloud clearance requirement?

  1. Only horizontal separation of 2,000 feet is required
  2. The aircraft must remain 500 feet below and 2,000 feet horizontally from clouds Correct answer.
  3. The aircraft may fly through clouds if visibility is 3 miles
  4. Cloud clearance is not required in Class G airspace

Explanation

Part 107 applies its cloud clearance minima regardless of airspace class, so the 500-foot-below and 2,000-foot-horizontal standard governs even in Class G. Flying through clouds is never permitted under these rules.

Question 23Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

What is the maximum allowable weight of a small unmanned aircraft under Part 107, including everything on board or attached?

  1. 55 pounds Correct answer.
  2. 25 pounds
  3. 33 pounds
  4. 50 pounds

Explanation

A small unmanned aircraft may weigh no more than 55 pounds at takeoff, including all equipment and payload. Operations above that weight fall outside Part 107.

Question 24Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

A remote pilot plans to operate a 40-pound sUAS at night. What additional requirement applies to the remote pilot in command?

  1. The aircraft must be equipped with a strobe visible for 3 miles
  2. No additional requirement applies at night
  3. A second visual observer is mandatory
  4. The remote pilot must complete a knowledge test on night operations Correct answer.

Explanation

Night operations under Part 107 require the remote pilot in command to have completed a training or knowledge requirement specific to night operations. Anti-collision lighting visible for 3 statute miles is also required, but a second observer is not.

Question 25Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

A remote pilot is operating under Part 107 and a manned aircraft enters the area. What is the remote pilot's responsibility?

  1. Maintain the right of way because the sUAS is smaller
  2. Continue the flight if the sUAS remains below 400 feet
  3. Yield the right of way to the manned aircraft Correct answer.
  4. Contact ATC to request priority

Explanation

Part 107 requires the remote pilot to yield the right of way to all manned aircraft. The sUAS must give way regardless of altitude or the other aircraft's position.

Question 26Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

What is the maximum altitude at which a small UAS may be flown in Class G airspace near a structure, assuming all other Part 107 requirements are met?

  1. 400 feet above the structure's uppermost limit, within 400 feet of it Correct answer.
  2. 400 feet AGL regardless of structures
  3. 1,200 feet AGL near any structure
  4. No limit exists in Class G airspace

Explanation

The structure exception allows flight up to 400 feet above a structure's uppermost limit when the aircraft is within a 400-foot radius of that structure. This applies in Class G and other non-controlled airspace.

Question 27Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

Which of the following operations is prohibited under Part 107 unless a waiver is granted?

  1. Operating from a moving vehicle in a sparsely populated area
  2. Flying at 100 feet AGL over private property
  3. Carrying a package for compensation
  4. Flying over people not directly participating in the operation Correct answer.

Explanation

Operations over people who are not directly participating in the operation are restricted under Part 107 and generally require compliance with category requirements or a waiver. The other listed activities are permitted without a waiver.

Question 28Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

A remote pilot wants to operate a sUAS from a moving vehicle in a sparsely populated area. Under Part 107, which statement is accurate?

  1. This requires a Part 107 waiver in all cases
  2. This is prohibited in all circumstances
  3. This is only permitted with a visual observer
  4. This is permitted without a waiver Correct answer.

Explanation

Part 107 permits operation from a moving vehicle when the operation is conducted in a sparsely populated area. No waiver is required for that specific allowance.

Question 29Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

Which class of airspace generally requires prior authorization for sUAS operations under Part 107?

  1. Class E surface area
  2. Class B Correct answer.
  3. Class G
  4. Class F

Explanation

Class B airspace requires prior authorization (ATC permission or a waiver) for Part 107 operations. Class G is generally uncontrolled, and Class F is not used in the United States.

Question 30Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

A remote pilot intends to fly in Class C airspace. What must the pilot obtain before operating?

  1. Nothing, because Class C is uncontrolled
  2. A letter of agreement from the FAA district office
  3. A certificate of waiver for all Class C operations
  4. Prior authorization from ATC Correct answer.

Explanation

Class C airspace requires prior ATC authorization for Part 107 operations. The pilot must coordinate with the controlling facility before flight.

Question 31Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

A remote pilot is flying near a stadium hosting a major sporting event. Which restriction applies under Part 107?

  1. Flight is permitted if a visual observer is used
  2. Flight is prohibited within the designated TFR area unless authorized Correct answer.
  3. Flight is permitted if the sUAS stays below 200 feet
  4. Flight is permitted if the operator has a remote pilot certificate

Explanation

The FAA issues temporary flight restrictions around certain stadiums during major events, and sUAS operations within the TFR are prohibited absent specific authorization. A remote pilot certificate or observer does not create an exception.

Question 32Airspace classification, operating requirements, and flight restrictions affecting small unmanned aircraft operation

Which statement correctly describes the requirement for a remote pilot to inspect the sUAS before flight?

  1. No inspection is required if the aircraft was inspected the previous day
  2. An inspection is required only after maintenance
  3. An inspection is required only for commercial operations
  4. A preflight inspection is required before each flight Correct answer.

Explanation

Part 107 requires the remote pilot in command to conduct a preflight inspection to ensure the sUAS is in a condition for safe operation before each flight. A prior day's inspection does not satisfy the requirement.

Question 33Aviation weather sources and effects of weather on small unmanned aircraft performance

In a METAR observation, the term AGL refers to the height of a reported value above which reference point?

  1. The aircraft's takeoff point
  2. Mean sea level
  3. The station's field elevation
  4. Ground level Correct answer.

Explanation

Cloud layer heights and similar elements in a METAR are reported above ground level (AGL), whereas altimeter settings and many other products use mean sea level. This distinction matters because sUAS operations are conducted at low altitudes measured above the surface.

Question 34Aviation weather sources and effects of weather on small unmanned aircraft performance

A METAR reports winds as 27015G25KT. What does the G25 indicate?

  1. Gust spread of 25 degrees
  2. Visibility reduced to 25 percent
  3. Gusting to 25 knots Correct answer.
  4. Pressure falling at 25 hPa per hour

Explanation

In the wind group, the two digits after G represent the peak gust speed in knots. A gust is a brief, rapid fluctuation in wind speed typically lasting under a minute.

Question 35Aviation weather sources and effects of weather on small unmanned aircraft performance

You are planning a midday flight in summer over a large paved parking area. Which surface condition should you expect?

  1. Steady laminar flow with no vertical motion
  2. Reduced density altitude over the asphalt
  3. A low-level thermal updraft over the pavement Correct answer.
  4. A downdraft that persists all afternoon

Explanation

Paved surfaces heat rapidly in sunlight and warm the air directly above them, producing convective thermals and bumpy low-level conditions. Small unmanned aircraft are light and respond noticeably to this turbulence.

Question 36Aviation weather sources and effects of weather on small unmanned aircraft performance

What is the primary purpose of a TAF?

  1. To report winds aloft along a route
  2. To warn of hazardous weather already occurring
  3. To forecast conditions at an airport for a specified period Correct answer.
  4. To record observed weather at the time of issuance

Explanation

A Terminal Aerodrome Forecast describes expected conditions at an airport over a stated forecast period. It is forward-looking, unlike an observation such as a METAR.

Question 37Aviation weather sources and effects of weather on small unmanned aircraft performance

Which condition most strongly increases density altitude?

  1. Strong wind aligned with the runway
  2. High pressure combined with cold air
  3. Low temperature combined with low humidity at a given elevation
  4. High temperature combined with high humidity at a given elevation Correct answer.

Explanation

Hot, humid air is less dense than cool, dry air at the same pressure, so density altitude rises as temperature and humidity increase. Higher density altitude degrades propeller and wing performance.

Question 38Aviation weather sources and effects of weather on small unmanned aircraft performance

A METAR reports ceiling broken at 800 feet AGL. How should this affect a planned sUAS flight under 14 CFR part 107?

  1. It requires the flight to be conducted at night
  2. It automatically permits flight in the cloud layer
  3. It may limit the flight because cloud clearance requirements must still be met Correct answer.
  4. It has no effect because the aircraft stays below 400 feet

Explanation

Part 107 requires maintaining distance from clouds, so a low ceiling constrains how the aircraft can be positioned in the airspace. A broken layer at 800 feet leaves limited room to satisfy cloud clearance while remaining below 400 feet.

Question 39Aviation weather sources and effects of weather on small unmanned aircraft performance

An automated surface observing system reports a wind of 18012KT while the only runway at the site is oriented 090/270. How would a manned-aircraft pilot describe this wind relative to the runway?

  1. Calm conditions
  2. A direct headwind at 12 knots
  3. A direct crosswind at 12 knots Correct answer.
  4. A direct tailwind at 12 knots

Explanation

The wind is from 180 degrees while the runway runs east-west, so the wind crosses the runway at roughly 90 degrees. The full 12-knot speed is therefore experienced as a crosswind component.

Question 40Aviation weather sources and effects of weather on small unmanned aircraft performance

When reading a TAF, a group of FM indicates what?

  1. The end of the forecast period
  2. A probability of precipitation
  3. A temporary fluctuation expected to last under an hour
  4. A rapid, lasting change beginning at the stated time Correct answer.

Explanation

FM groups mark the start of a new set of prevailing conditions that supersede the previous ones at the stated time. They represent a sustained change rather than a brief fluctuation.

Question 41Aviation weather sources and effects of weather on small unmanned aircraft performance

A remote pilot sees an area forecast discussion indicating strong daytime surface heating and light winds. Which hazard is most likely during the afternoon?

  1. Dense radiation fog
  2. Low-level wind shear from a strong jet
  3. Convective turbulence and dust devils Correct answer.
  4. Widespread freezing rain

Explanation

Strong surface heating with light winds favors convective thermals and, over dry ground, dust devils. These produce localized, unpredictable bumps hazardous to small unmanned aircraft.

Question 42Aviation weather sources and effects of weather on small unmanned aircraft performance

What does a SIGMET advise?

  1. Forecast winds and temperatures at altitude
  2. Hazardous weather significant to aircraft over a broad area Correct answer.
  3. A short-term forecast for one terminal
  4. Routine hourly weather at a single airport

Explanation

A SIGMET is issued for weather phenomena that are potentially hazardous to all aircraft across a designated area. It covers significant conditions such as severe turbulence, icing, or volcanic ash.

Question 43Aviation weather sources and effects of weather on small unmanned aircraft performance

A remote pilot is deciding between two sites at the same elevation. Site A is over a dark plowed field; Site B is over a snow-covered field. On a sunny day, which site will more likely produce thermal updrafts?

  1. Both equally, because elevation is identical
  2. Neither, because both surfaces are flat
  3. Site B, because snow reflects heat upward
  4. Site A, because dark surfaces absorb more solar energy Correct answer.

Explanation

Dark, dry surfaces absorb more solar radiation and heat the overlying air more strongly, producing thermals. Highly reflective snow stays cooler and generates weaker convection.

Question 44Aviation weather sources and effects of weather on small unmanned aircraft performance

Fog is most likely to form under which combination of conditions?

  1. Rapid daytime heating with low humidity
  2. Cooling to near the dew point with light wind and high humidity Correct answer.
  3. Strong gusty wind with low humidity
  4. Increasing temperature spread with falling humidity

Explanation

Fog forms when air cools to its dew point or moisture is added until saturation occurs. Light wind and high humidity favor the process by limiting mixing and keeping moisture near the surface.

Question 45Aviation weather sources and effects of weather on small unmanned aircraft performance

A remote pilot plans a flight in an area where the local altimeter setting is 29.62 inHg and the temperature is 95 degrees F. How does this combination affect aircraft performance compared with standard conditions?

  1. Performance is degraded only because of the altimeter setting alone
  2. Performance is degraded because low pressure and high temperature reduce air density Correct answer.
  3. Performance is unchanged because altimeter setting does not affect density
  4. Performance is improved because low pressure increases lift

Explanation

Lower pressure and higher temperature both reduce air density, which raises density altitude and reduces lift and thrust. The effects compound rather than cancel.

Question 46Aviation weather sources and effects of weather on small unmanned aircraft performance

Why should a remote pilot treat reported surface winds with caution when flying near tall buildings?

  1. Buildings always eliminate wind at ground level
  2. Buildings create localized turbulence and channeling that may not appear in a regional report Correct answer.
  3. Wind reported at an airport applies only to manned aircraft
  4. Surface reports are only valid above 3,000 feet

Explanation

Structures disrupt airflow, producing eddies, updrafts, and channeling that can differ sharply from a nearby reporting station. A regional or airport report cannot capture these local effects.

Question 47Aviation weather sources and effects of weather on small unmanned aircraft performance

A METAR remark shows a temperature of 34 degrees F and a dew point of 33 degrees F with reported precipitation. Which hazard is most relevant to a small unmanned aircraft?

  1. Possible icing on the airframe and propellers Correct answer.
  2. Severe convective turbulence
  3. Rapid improvement in density altitude
  4. Extreme crosswind

Explanation

When the temperature is near or below freezing and precipitation is occurring, supercooled water can freeze on exposed surfaces. Ice accumulation on a small aircraft degrades lift and can unbalance propellers.

Question 48Aviation weather sources and effects of weather on small unmanned aircraft performance

A TAF includes a TEMPO group for 2SM BR lasting several hours during your planned flight window. What is the most reasonable operational interpretation?

  1. The forecast guarantees clear skies
  2. Mist will not occur because TEMPO indicates no weather
  3. Visibility may briefly drop to 2 statute miles with mist, so plan for reduced visual references Correct answer.
  4. Visibility will remain at 2 statute miles for the entire period without change

Explanation

TEMPO denotes temporary fluctuations expected to last less than an hour at a time within the larger period. The group signals that reduced visibility from mist is plausible during the window, so the pilot should prepare for degraded visual conditions.

Question 49Aviation weather sources and effects of weather on small unmanned aircraft performance

A remote pilot compares an airport METAR taken several miles away with conditions at a canyon-rim launch site. Which reasoning best explains why the METAR may understate the hazard?

  1. Distant METARs report only temperature and pressure
  2. Canyon rims always experience calmer air than surrounding terrain
  3. METARs are only valid for manned aircraft operations
  4. Terrain can accelerate and deflect wind locally, producing conditions not captured at the distant station Correct answer.

Explanation

Orographic effects can funnel and accelerate wind along ridges and canyon edges, creating localized shear and rotors. A station several miles away may not sample these terrain-driven effects.

Question 50Small unmanned aircraft loading

Under Part 107, a small unmanned aircraft and its attached systems must weigh less than what maximum value at takeoff?

  1. 55 pounds Correct answer.
  2. 100 pounds
  3. 44 pounds
  4. 25 pounds

Explanation

Part 107 defines a small unmanned aircraft as one weighing less than 55 pounds on takeoff, including everything onboard or attached. The limit applies to the total takeoff weight, not just the bare airframe.