Maximum Part 107 groundspeed

87 knots, which equals 100 mph. This is groundspeed, not airspeed.

Visibility and cloud-clearance minimums

At least 3 statute miles flight visibility from the control station, 500 feet below clouds, and 2,000 feet horizontally from clouds.

When does night begin?

At the end of evening civil twilight. It ends at the beginning of morning civil twilight.

Above ground level; altitude measured from the terrain or surface directly below the aircraft.

The period from the end of evening civil twilight to the beginning of morning civil twilight.

An FAA certificate of waiver that permits deviation from a specifically waivable rule under stated conditions after the applicant demonstrates safe operation.

Operating Limits, Night Flight, Special Operations, and Waivers — FAA Part 107 Remote Pilot: Comprehensive Exam-Ready Certification Course

Build a Rule-by-Rule Mission Screen

Think in layers

A flight is compliant only when every applicable rule is met. Screen the mission instead of relying on intuition: time, weather, altitude, speed, launch method, equipment, payload, and waiver status.

Preflight sequence

Classify the mission, check numerical limits, check vehicle and equipment restrictions, then verify VLOS, airspace, people, and any authorization. A passed weather check does not cure a vehicle-rule violation.

Waiver discipline

A waiver changes only the provision and conditions stated in it. It does not erase the rest of Part 107. On exam questions, test each stated fact against each applicable rule.

Operating Limits: Speed, Altitude, Visibility, and Clouds

Memorize the four numbers

87 knots maximum groundspeed; 400 feet AGL normally; 3 statute miles minimum flight visibility from the control station; clouds require 500 feet below and 2,000 feet horizontal.

Structure exception

Within a 400-foot radius of a structure, the UAS may fly up to 400 feet above its immediate uppermost limit. Outside that radius, return to the normal 400-foot AGL ceiling.

Two common distractors

AGL is not MSL. Also, cloud clearance has two independent tests: vertical and horizontal. Passing one distance does not excuse failure of the other.

Worked Mission Screen: The Cell-Tower Survey

Facts that pass

The 82-knot groundspeed is below 87 knots. At 250 feet from a 180-foot tower, the special altitude ceiling is 580 feet AGL, so a 560-foot flight passes that test.

Calculate cloud separation

Vertical cloud clearance is 1,200 minus 560, or 640 feet. That exceeds the required 500 feet below. But cloud clearance is not only a vertical calculation.

Final result

Directly beneath a cloud means zero horizontal separation, not the required 2,000 feet. The flight is unlawful as planned even though most individual limits are satisfied.

Daylight, Civil Twilight, and Night Operations

Time categories

Daylight begins at morning civil twilight and ends at evening civil twilight. Night begins when evening civil twilight ends and ends when morning civil twilight begins.

Night equipment and training

At night, use lighted anti-collision lighting visible for at least 3 statute miles with a flash rate sufficient to avoid a collision. The remote PIC also needs applicable night-content testing or recurrent training.

Intensity exception

The remote PIC may reduce light intensity only when necessary to ensure small-UAS safety, such as avoiding harmful glare. The rule does not authorize dimming merely for convenience.

Quiz: Night Lighting Decision

A small UAS will operate 20 minutes after the end of evening civil twilight. It has a steady white light visible for 4 statute miles, but it does not flash. The remote PIC has completed the required night training. Which statement is most accurate?

Is the operation compliant with the night-lighting requirement?

Yes, because the light is visible beyond 3 statute miles.
Yes, because a steady light is safer than a flashing light.
No, because the light must be anti-collision lighting with a flash rate sufficient to avoid a collision.
No, because all night operations require an FAA waiver.

Show Answer

Answer: C) No, because the light must be anti-collision lighting with a flash rate sufficient to avoid a collision.

The operation is at night. Section 107.29 requires lighted anti-collision lighting visible for at least 3 statute miles and a flash rate sufficient to avoid a collision. Visibility alone does not establish compliance, and routine night operations no longer require a waiver when the rule's conditions are met.

Moving Vehicles and Automated Flight

Vehicle distinctions

Never operate from a moving aircraft under the ordinary rule. From a moving land or water vehicle, operate only over a sparsely populated area and only when not transporting property for compensation or hire.

Automation is not a substitute

Waypoint and return-to-home functions can be automated. The remote PIC still needs authority, intervention capability, VLOS compliance, and responsibility for every operating limitation.

Read the word automatically carefully

Ask who controls the mission, whether intervention is possible, whether VLOS is maintained, and whether all other limits still apply. Software does not become the legal operator.

Property, Hazardous Material, Transponders, and ADS-B Out

Compensated property transport

Transporting another person's property for compensation or hire can occur under Part 107 when its conditions are met: registered eligible UAS, less than 55 pounds, VLOS, U.S. operation, certificated remote PIC, inspection, and applicable rules.

Hazardous material

Hazardous-material carriage is prohibited under Part 107. The stated exception is a hazardous-material payload on a small UAS operating under Part 137 agricultural-aircraft operations.

Do not confuse broadcast systems

Do not operate in a way requiring an ATC transponder. Do not operate with ADS-B Out unless FAA-authorized. ADS-B Out and Remote ID are different systems and different compliance questions.

Constructing a Waiver Safety Case

What a waiver must prove

A waiver application must show that the operation can be conducted safely under the waiver's terms. Need or commercial value alone is not a safety justification.

Build the evidence

State the exact rule, then identify hazards and specific mitigations. Define qualified personnel, communications, aircraft capability, operating boundaries, abort criteria, and how waiver conditions will be verified.

Scope controls

A waiver is effective only within its written conditions. It must exist before the flight and does not waive unrelated requirements or permit an operation beyond its approved location, time, crew, or aircraft limits.

Mission Triage: Find Every Issue

Thought exercise

A production company proposes filming a coastal resort from a moving boat at 7:30 p.m. Evening civil twilight ended at 7:15 p.m. The UAS will fly at 70 knots, 350 feet AGL, with 5 statute miles of visibility. It carries an anti-collision light visible for 3 statute miles, but the light flashes so slowly that another pilot may not recognize it as an anti-collision light. The flight is over a crowded beach, and the company says it has "a waiver for night operations."

Pause and identify the issues before revealing the analysis.

Self-check analysis

The operation is at night, because evening civil twilight has ended.
The speed, altitude, and stated visibility satisfy the listed Section 107.51 numerical limits.
Night lighting still fails if its flash rate is not sufficient to avoid a collision, even though it is visible for 3 statute miles.
Launching or operating from a moving water-borne vehicle is allowed only over a sparsely populated area and only if not transporting property for compensation or hire. A crowded beach is not sparsely populated.
Operations over people require their own compliance path; a night waiver does not solve an over-people issue.
A claimed waiver must be checked for its exact provision and conditions. Since routine night operations are allowed when Section 107.29 is met, the cited waiver does not excuse inadequate lighting or unrelated violations.

The key habit: do not stop after finding the first violation.

Flashcards: Limits and Special Operations

Flip each card, state the answer aloud, then connect it to a mission-screening decision.

Maximum Part 107 groundspeed: 87 knots, which equals 100 mph. This is groundspeed, not airspeed.
Ordinary maximum altitude: 400 feet above ground level. Within a 400-foot radius of a structure, the UAS may fly up to 400 feet above the structure's immediate uppermost limit.
Visibility and cloud-clearance minimums: At least 3 statute miles flight visibility from the control station, 500 feet below clouds, and 2,000 feet horizontally from clouds.
When does night begin?: At the end of evening civil twilight. It ends at the beginning of morning civil twilight.
Night anti-collision light standard: Lighted anti-collision lighting visible for at least 3 statute miles with a flash rate sufficient to avoid a collision.
Moving land or water vehicle exception: Only over a sparsely populated area and only when the operation does not involve transporting property for compensation or hire.
ADS-B Out rule: Do not operate a small UAS with ADS-B Out equipment unless otherwise authorized by the FAA. ADS-B Out is not Remote ID.
Core waiver safety-case elements: Exact rule, hazards, mitigations, qualified personnel, defined operating boundaries, procedures, and compliance with every waiver condition.

Quiz: Structure Allowance and Vehicle Rule

A remote pilot launches from a moving pickup in a sparsely populated desert. The UAS is not carrying property for compensation or hire. It remains 300 feet horizontally from a 250-foot communications tower and flies at 630 feet AGL. Which answer is correct?

Evaluate the moving-vehicle and altitude portions of the operation.

Both are compliant: the vehicle exception applies, and the structure ceiling is 650 feet AGL.
The vehicle operation is prohibited because all moving-vehicle launches are prohibited.
The altitude is prohibited because no small UAS may exceed 400 feet AGL.
Both are prohibited because structure allowances apply only to manned aircraft.