SkarpChapter 4 of 23
Operations Over People and Moving Vehicles
Flying above a person is not governed by one universal rule; aircraft design, injury potential, site access, flight duration, and airworthiness all matter. Careful comparisons among the four categories turn one of the exam’s densest topics into a repeatable classification process.
Start With the Classification Process
The governing rule
Operations over people are governed by 14 CFR 107.39. First identify the aircraft's approved category; then apply that category's operating limits. A pilot's experience alone does not create eligibility.
Categories in order
- Category 1
- Category 2
- Category 3
- Category 4
The categories use different ways to manage injury risk: low weight, tested performance, site and flight-path controls, or airworthiness certification.
Six-question mission screen
Check category, approved configuration, people below, site access, flight path, and continuing compliance such as Remote ID, defects, maintenance, and operating limitations. This sequence prevents most exam distractors.
Category 1: Low Weight Does Not Mean No Limits
The 0.55-pound test
Category 1 requires a takeoff weight of 0.55 pounds or less, including everything on board or attached. Test the actual ready-to-fly aircraft, not the advertised empty weight.
Rotors and attachments
The aircraft may not have exposed rotating parts that would lacerate human skin upon impact. Guards can address laceration risk, but their weight and every attached item still count toward 0.55 pounds.
Crowds and Remote ID
Category 1 permits sustained flight over an open-air assembly ONLY when the aircraft meets Remote ID — standard Remote ID or a broadcast module (14 CFR 89.110 / 89.115(a)). Without Remote ID, no sustained flight over the assembly. Low weight is one condition, not a blanket permission to fly over anyone.
Category 2: Tested Injury Performance
The Category 2 threshold
Category 2 focuses on injury severity, not a single weight limit. The blunt-force threshold is 11 foot-pounds of kinetic energy. This is lower than the Category 3 threshold.
Why a formula is not certification
Although `KE = 1/2 mv²` explains the physics, compliance is not a pilot's estimate. It depends on an FAA-accepted Means of Compliance and the approved aircraft configuration.
Required compliance package
Category 2 requires laceration protection, no safety defect, a Category 2 label, a Declaration of Compliance, and applicable Remote ID compliance. All are required; no single item is enough.
Category 3: More Energy, Tighter Operations
The Category 3 threshold
Category 3 permits up to 25 foot-pounds of blunt-force kinetic energy before reaching its injury-severity limit. It still requires no lacerating exposed rotating parts and no safety defect.
Closed or restricted access
The operation must be over a closed- or restricted-access site, and everyone within the site must be on notice that a small unmanned aircraft may fly over them. Public access must be genuinely controlled.
Sustained flight restriction
Category 3 may not maintain sustained flight over a person unless that person is directly participating. Hovering, orbiting, and repeated overhead passes are sustained; an incidental crossing may be transient.
Category 4: Airworthiness and Continuing Compliance
Airworthiness is the gateway
Category 4 requires an airworthiness certificate issued under 14 CFR part 21. The aircraft then must be operated under its approved flight manual limitations or limitations otherwise specified by the Administrator.
Maintenance and alterations matter
Maintenance, preventive maintenance, alterations, and inspections must follow the certificate-related requirements or acceptable instructions. A seemingly minor unapproved modification can break Category 4 eligibility.
Not simply a larger Category 2
Category 4 also requires no safety defect, no lacerating exposed rotating parts, and applicable Remote ID compliance; sustained flight over an open-air assembly additionally requires standard Remote ID or a broadcast module (14 CFR 89.110 / 89.115(a)). Its key distinction is certified airworthiness.
People, Vehicles, and Operational Areas
Three different concepts
Do not merge an open-air assembly, a closed or restricted-access site, and people inside moving vehicles. Each phrase triggers different limits under the operations-over-people rules.
A real controlled site
A controlled construction site may use gates, barriers, briefing, and access procedures so people are on notice. An unfenced public park with a sign is usually not enough to establish restricted access.
Moving vehicles
Avoid undue hazard in a loss of control. Flight may remain over a notified closed or restricted site, or it may avoid sustained flight over moving vehicles. Brief transit is not the same as following traffic.
Decision Drill: Choose the First Disqualifier
Mission-screening exercise
For each mission, identify the first fact that prevents the proposed operation. Then name the corrective action.
- A 0.54-pound aircraft has exposed, unguarded propellers. The pilot wants to film people waiting outside a stadium.
- First disqualifier: ``
- Corrective action: ``
- A labeled Category 3 aircraft hovers for two minutes above an uninvolved worker at a controlled factory site. The worker received the site notice.
- First disqualifier: ``
- Corrective action: ``
- A Category 2 aircraft has the correct label and Declaration of Compliance, but the owner installed a heavier third-party payload that was not part of the evaluated configuration.
- First disqualifier: ``
- Corrective action: ``
Suggested answers
- Exposed rotating parts capable of lacerating skin; also, sustained flight over the stadium crowd (an open-air assembly) requires Remote ID compliance — and is never allowed under Category 3. Use an eligible configuration and a lawful flight path.
- Sustained flight over a person who is not directly participating. Reposition, limit the path to transient crossings where appropriate, or ensure the person is a direct participant when the rule permits.
- The aircraft's approved Category 2 configuration may no longer be supported. Remove the payload or obtain a configuration supported by the applicable compliance documentation.
The key habit is to stop at the first failed gate. A mission can have multiple violations, but identifying the earliest failed requirement makes your analysis fast and defensible.
Quiz: Category 2 or Category 3?
Choose the best answer. Focus on the injury threshold and the operational restriction, not just the aircraft's size.
Which statement correctly compares Category 2 and Category 3 operations over people?
- Category 2 has a 25 foot-pound threshold and may maintain sustained flight over any person.
- Category 3 has a 25 foot-pound threshold and may not maintain sustained flight over a person unless that person is directly participating in the operation.
- Category 2 and Category 3 both use the 0.55-pound takeoff-weight threshold.
- Category 3 requires an airworthiness certificate issued under Part 21, while Category 2 requires no documentation.
Show Answer
Answer: B) Category 3 has a 25 foot-pound threshold and may not maintain sustained flight over a person unless that person is directly participating in the operation.
Category 3 uses the 25 foot-pound blunt-force kinetic-energy threshold and restricts sustained flight over people who are not directly participating. Category 2 uses 11 foot-pounds. Both Categories 2 and 3 require a Means of Compliance, Declaration of Compliance, labeling, and other applicable conditions; Category 4 is the airworthiness-certificate path.
Documentation, Labels, Defects, and Modifications
Who does what?
The producer uses an accepted Means of Compliance and submits a Declaration of Compliance for Category 2 or 3. The remote PIC must verify the aircraft remains in the documented, eligible configuration.
Configuration control
Required guards, approved batteries, firmware, payload limits, and other listed items are compliance conditions. A catalog item described as optional may still be required for a specific compliant configuration.
Defects and self-built aircraft
A safety defect ends the analysis: do not fly over people until it is resolved. A self-built or modified aircraft does not gain a category merely through testing; it needs the applicable compliance path.
Flashcards: High-Yield Distinctions
Flip each card, then say the answer before revealing it. Pay special attention to the numbers and documentation pathways.
- Categories of operations over people, in order
- Category 1, Category 2, Category 3, Category 4
- Category 1 takeoff-weight limit
- 0.55 pounds or less, including everything on board or otherwise attached to the aircraft.
- Category 2 blunt-force threshold
- 11 foot-pounds of blunt force kinetic energy.
- Category 3 blunt-force threshold
- 25 foot-pounds of blunt force kinetic energy.
- Declaration of Compliance
- A record submitted to the FAA that certifies the small unmanned aircraft conforms to the Category 2 or Category 3 requirements under subpart D of this part.
- Which category requires an airworthiness certificate under Part 21?
- Category 4.
- What is sustained flight?
- Hovering over a person or flying above a person in a manner that is not merely transitory.
- Types of Remote Identification under 14 CFR part 89
- Standard remote identification; Alternative remote identification.
Cumulative Mission Decision
Read every fact. The best answer is the one that identifies the controlling rule and does not assume a document or a light weight cures every restriction.
A remote PIC proposes to use a properly labeled Category 1 aircraft weighing 0.53 pounds at takeoff. It has no exposed rotating parts capable of lacerating skin and meets applicable Remote ID requirements. The plan is to hover directly above spectators at an outdoor music festival. What is the best answer?
- The operation is permitted because the aircraft is below 0.55 pounds.
- The operation is permitted if the PIC announces the flight to the crowd.
- The operation is not permitted because Category 1 may not operate over an open-air assembly of human beings.
- The operation is not permitted unless the producer submits a Category 3 Declaration of Compliance.
Show Answer
Answer: C) The operation is not permitted because Category 1 may not operate over an open-air assembly of human beings.
The aircraft meets several Category 1 conditions, but Category 1 operations may not be conducted over an open-air assembly of human beings. Announcing the flight does not remove that prohibition. A Category 3 Declaration of Compliance is not a substitute for Category 1 compliance and would introduce a different set of requirements.
Key Terms
- Category 1
- An operations-over-people category for an eligible small unmanned aircraft weighing 0.55 pounds or less on takeoff, including everything on board or attached, with no exposed rotating parts that would lacerate human skin upon impact.
- Category 2
- An operations-over-people category based on demonstrated injury performance, including an 11 foot-pound blunt-force kinetic-energy threshold, laceration protection, no safety defect, labeling, and a Declaration of Compliance.
- Category 3
- An operations-over-people category based on demonstrated injury performance, including a 25 foot-pound blunt-force kinetic-energy threshold, laceration protection, no safety defect, labeling, a Declaration of Compliance, controlled-site requirements, and sustained-flight restrictions.
- Category 4
- An operations-over-people category requiring an airworthiness certificate issued under 14 CFR part 21 and operation under approved or Administrator-specified limitations.
- sustained flight
- Hovering above a person or flying above a person in a manner that is not merely transitory.
- open-air assembly
- A gathering of people outdoors, such as an outdoor concert audience, festival crowd, or packed parade spectators.
- Means of Compliance
- An FAA-accepted method for showing that an unmanned aircraft design satisfies applicable performance-based requirements.
- impact kinetic energy
- Energy associated with an aircraft's motion at impact; it depends on mass and the square of velocity.
- exposed rotating parts
- Rotating components that are exposed and would lacerate human skin upon impact.
- Declaration of Compliance
- A record submitted to the FAA that certifies the small unmanned aircraft conforms to the Category 2 or Category 3 requirements under subpart D of this part.
- standard remote identification
- A small unmanned aircraft system that is designed and produced to transmit identification and location information of the unmanned aircraft and control station in accordance with the requirements of 14 CFR part 89 for standard remote identification.
- closed or restricted-access site
- An operational area where access is controlled and persons within the site are on notice that a small unmanned aircraft may fly over them.