SkarpChapter 21 of 23
Field Procedures for Night and Operations Over People
Regulatory eligibility is only the beginning of a safe night or over-people mission. Operational zones, participant control, lighting, escape paths, vehicle movement, and contingency triggers must work together at the launch site.
1. Start With a Field-Level Go/No-Go Decision
Legal Is Not Automatically Safe
A compliant night or over-people operation can still be unsafe. Treat regulatory eligibility as the first gate, followed by a real-time site-risk decision.
RPIC Authority
The RPIC must be designated and is directly responsible for the operation. Delegating a task to a crew member does not transfer final authority.
Five Pre-Arm Gates
Verify authority, exposure, aircraft and crew readiness, site viability, and termination triggers before arming. A weak gate means pause or redesign.
Exam Trap
Do not choose "launch because it is legal" when a safer alternative exists. Part 107 requires judgment, not just a checklist signature.
2. Build the Night-Operation Site Setup
Inspect Before Darkness
Walk the launch area, landing zone, alternates, and route while obstacles remain visible. Night is a poor time to discover wires, uneven ground, or a blocked exit.
Protect Night Vision
Dim screens, avoid direct glare, and keep ground lights aimed downward. Bright white light can degrade the pilot's dark adaptation when it matters most.
Required Aircraft Light
For night operations, use anti-collision lighting visible for at least 3 statute miles. Verify it physically; do not assume the app setting proves visibility.
Landing Areas Matter
Choose a primary and alternate landing area before launch. Each should be clear of people, vehicles, loose debris, and lighting that blinds the pilot.
Civil Twilight
Night begins after evening civil twilight and ends before morning civil twilight. Use location-specific published times, not a memorized "30-minute" shortcut.
3. Verify Operations-Over-People Eligibility
All Four Categories
The complete list is Category 1, Category 2, Category 3, Category 4. Categories describe more than aircraft weight; each has distinct eligibility and operating limits.
Category 1
Category 1 requires an aircraft at or below 0.55 pounds at takeoff and no exposed rotating parts likely to lacerate human skin on impact.
Categories 2 and 3
For Category 2 or 3, verify the exact aircraft, FAA-accepted Declaration of Compliance, required label, and manufacturer operating instructions.
Category 4
Category 4 is based on FAA airworthiness certification and associated maintenance and operating requirements. It is a separate compliance pathway, not a casual upgrade.
Configuration Control
A category claim applies to a compliant configuration. Added accessories, altered guards, or unsupported payloads can change the risk and defeat your assumption.
4. Control People: Participants, Non-Participants, and Access
Classify the People
Identify who is directly participating, who is a non-participant, and who may enter later. Crowd status can change during a mission, especially at night.
Brief Direct Participants
Explain the route, hazards, safe area, stop-flight command, and emergency actions. They must know what the operation is and how to stay clear.
Control Non-Participant Access
Use barriers, signs, crew positions, and route design. A notice sign helps, but it does not substitute for a credible method of keeping people clear.
Night Boundaries
Make boundaries visible with reflective or low-glare markings. Avoid lights that shine into the pilot's eyes or make the landing-zone surface harder to see.
5. Manage Moving-Vehicle Exposure
From vs. Over a Vehicle
Operating from a moving vehicle is allowed only over a sparsely populated area. Operating over moving vehicles is an exposure problem governed by separate rules.
What Is Sustained Flight?
Hovering, pacing, or making repeated passes above a moving vehicle is sustained flight. A prompt crossing to another location is safer than tracking traffic.
Closed or Restricted Site
Sustained flight may be possible at a closed- or restricted-access site only when every person inside moving vehicles has been notified of the UAS activity.
Category 4 Limit
Sustained flight over moving vehicles with a Category 4 small UAS is prohibited. A closed site does not remove this Category 4 limitation.
Route Geometry
Do not fly along a traffic lane for dramatic footage. Cross quickly when authorized, maintain an escape direction away from vehicles, and protect landing corridors.
6. Design Flight Paths, Lighting, and Contingencies
Layered Site Design
Use a sterile launch zone, a normal flight corridor, exclusion areas, and contingency zones. Each zone reduces the chance that one failure reaches people or property.
No Magic Standoff Number
Part 107 does not provide one universal safe distance. Choose a conservative buffer from mass, speed, wind, accuracy, obstacles, and crowd movement.
Termination Zones
Select reachable locations where an immediate landing or termination produces the least foreseeable risk. Do not make this decision for the first time during an emergency.
Crew Calls
Assign airspace watch, access control, and hazard reporting before launch. Any crew member should be able to call a hazard; the RPIC decides the response.
Continuous Reassessment
Recheck wind, weather, lighting, battery state, traffic, crowd movement, and crew condition throughout the operation. Conditions can invalidate a sound plan quickly.
7. Worked Example: Night Exterior at a Closed Venue
Original Plan Problem
A 90-second hover above an active driveway is sustained exposure over moving vehicles. Category eligibility alone does not make that route acceptable.
Inspect the Real Site
The crane cable and pavement glare appear during the field inspection. Both require route and lighting changes even though they were absent from the original shot list.
Redesign, Do Not Rationalize
Move the operation to a controlled courtyard, notify authorized occupants, shift the route away from guests, and retain a protected landing area.
Clear Stop Triggers
Boundary breach, vehicle entry, excessive wind, lighting failure, or intruding aircraft each trigger an immediate landing. The crew knows this before takeoff.
8. Site-Plan Thought Exercise
Build a 60-second response plan
You are the RPIC for a night roof inspection. Your launch point is a fenced service lot. A public sidewalk lies west of the building, a parking-lot lane lies south, and a tall antenna is on the northeast corner. Your aircraft has compliant anti-collision lighting. A visual observer is available.
Before reading on, choose:
- Where is your sterile launch and landing zone?
- Which direction should the aircraft use as its normal escape path if wind suddenly increases from the west?
- Where will the visual observer stand to monitor the highest-risk entry and airspace areas?
- Name three immediate landing triggers.
Strong response
Use the fenced service lot as the sterile launch and landing zone only if its gate can be controlled and it is clear of workers, vehicles, and loose debris. With wind from the west, avoid placing the normal escape path toward the public sidewalk. A conservative route favors the open service-lot side or another pre-inspected clear area while maintaining obstacle clearance from the northeast antenna.
Place the visual observer where they can watch the sidewalk approach, parking-lot lane, and relevant airspace without standing in the launch zone or blocking the pilot. Useful triggers include an unauthorized person entering the lot, a vehicle entering the intended emergency corridor, loss of required anti-collision lighting, unexpected wind or drift, low battery, lost link, or an intruding aircraft.
Your plan is strongest when every crew member can point to the primary landing area, alternate landing area, exclusion boundary, and escape direction without asking the RPIC after launch.
9. Quiz: Night Lighting and Safety Margins
Choose the best Part 107 field procedure for this night mission.
During a night inspection, the anti-collision light is functioning, but new floodlights create glare that prevents the RPIC from reliably seeing the landing area. What is the best action?
- Continue because the aircraft anti-collision light remains visible for 3 statute miles.
- Increase altitude so the RPIC can see the aircraft against the sky.
- Pause the operation and correct the glare or relocate the landing area before continuing.
- Ask the visual observer to watch the landing area while the RPIC continues without changing the setup.
Show Answer
Answer: C) Pause the operation and correct the glare or relocate the landing area before continuing.
The required aircraft light does not solve a ground-site glare problem. If the RPIC cannot safely assess the landing area, the crew should pause and correct the site condition. A visual observer can assist, but does not make an unsafe landing setup acceptable.
10. Quiz: Sustained Flight Over Moving Vehicles
Apply the moving-vehicle rules to the exact category and site conditions.
A Category 4 small UAS is filming at a closed-access industrial site. Every vehicle occupant has been notified that UAS operations are occurring. May the RPIC conduct a sustained hover over a moving truck?
- Yes, because the site is closed-access and occupants received notice.
- Yes, because Category 4 is the highest category.
- No, sustained flight over moving vehicles with a Category 4 small UAS is prohibited.
- No, because no small UAS may ever fly over a moving vehicle.
Show Answer
Answer: C) No, sustained flight over moving vehicles with a Category 4 small UAS is prohibited.
Category 4 has a specific limitation: sustained flight over moving vehicles is prohibited. Closed or restricted access and occupant notice do not remove that Category 4 restriction. The final option is also wrong because some operations over moving vehicles may be conducted when applicable requirements are met.
11. Field Recall: Night and Over-People Procedures
Flip each card, answer aloud, and identify one way you would verify the item at an actual launch site.
- Night anti-collision lighting
- For a Part 107 night operation, anti-collision lighting must be visible for at least 3 statute miles. The RPIC may reduce intensity if the RPIC determines it is in the interest of safety.
- Civil twilight
- Night begins at the end of evening civil twilight and ends at the beginning of morning civil twilight. Use published times for the specific location and date.
- 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.
- Sustained flight
- Remaining over a person or moving vehicle for more than a brief period. Hovering, pacing, and repeated passes are practical examples of sustained exposure.
- Sterile launch/landing zone
- A controlled area kept clear of nonessential people, vehicles, loose debris, and other hazards during launch and landing.
- Emergency termination zone
- A preselected area where an immediate landing or termination presents the least foreseeable risk if the normal plan fails.
- Direct-participant control
- Brief the person on the mission, risks, safe area, boundaries, and stop-flight procedure. A casual public notice alone does not reliably control exposure.
- Real-time reassessment
- Continuously monitor weather, lighting, crowd movement, traffic, battery state, aircraft behavior, and crew condition. Terminate when safety margins disappear.
Key Terms
- civil twilight
- The period defined by published sunrise and sunset calculations that separates day from night for operational purposes.
- sustained flight
- Remaining over a person or moving vehicle for more than a brief period, such as hovering, pacing, or repeatedly passing over the same exposure.
- termination zone
- A selected area where a flight can be ended with the least foreseeable risk if an emergency requires immediate action.
- open-air assembly
- A gathering of people outdoors, such as a concert crowd, sporting-event spectators, parade viewers, or a large public gathering.
- direct participant
- A person meaningfully involved in the operation who has been informed of relevant risks and safety precautions; this status does not eliminate applicable category-specific operations-over-people requirements.
- emergency landing area
- A pre-inspected location that the RPIC can use for an immediate landing when normal flight cannot safely continue.
- anti-collision lighting
- Lighting required for Part 107 night operations that is visible for at least 3 statute miles, subject to the RPIC's authority to reduce intensity when doing so is in the interest of safety.