
Flying Over People
The FAA published its final rule on April 21, 2021 regarding aerial drones flying over people and flying at night. It’s posted to the FAA’s website at: Operations Over People General Overview.
This blog summarizes their new rule, but there are significant details left out for brevity. If you intend to fly over people or at night, then you’ll want to read the details. In addition, the FAA has published further details in their Circular 107-2A.
FAA’s Summary of their New Rule
Cited directly from the FAA, “This rule amends part 107 by permitting routine operations of small unmanned aircraft over people, moving vehicles, and at night under certain conditions. It also changes the recurrent training framework, expands the list of persons who may request the presentation of a remote pilot certificate, and makes other minor changes.”
Mike’s take on Aerial Drone Operations over People
The FAA established four categories of drone operations over people. Category 1 has the lowest requirements through Category 4, which has the strictest requirements.
Category 1 aerial drones must weigh 0.55 lbs or less and are permitted to transit over people as long as rotating parts are covered so as to prevent lacerations (read propeller guards). However, sustained flight over people is not allowed. Only a one-time transit over an assembled gathering is permitted.
Category 2 aerial drones must meet the requirements of Part 107.120 and be listed on an FAA-accepted Declaration of Compliance. However, sustained flight over people is not allowed. Only a one-time transit over an assembled gathering is permitted. Rotating parts must be covered so as to prevent lacerations.
Section 120 (which is new) states the aerial drone “Will not cause injury to a human being that is equivalent to or greater than the severity of injury caused by a transfer of 11 foot-pounds of kinetic energy upon impact from a rigid object.” (See example below.)
Category 3 aerial drones must meet the requirements of Part 107.130 and be listed on an FAA-accepted Declaration of Compliance. However, sustained flight over people is not allowed. Only a one-time transit over an assembled gathering is permitted, but exposure levels are a little more relaxed than Category 2. Operations over a restricted-access gathering of people is permitted as long as everyone has been notified that a small aerial drone may be flying over them. Rotating parts must be covered so as to prevent lacerations.
Section 130 (which is new) states the aerial drone “Will not cause injury to a human being that is equivalent to or greater than the severity of injury caused by a transfer of 25 foot-pounds of kinetic energy upon impact from a rigid object.” (See example below.)
Category 4 aerial drones and operators must meet a higher degree of certification. The FAA states “Eligible Category 4 small unmanned aircraft must have an airworthiness certificate issued by the FAA under Part 21 and must be operated in accordance with the operating limitations specified in the FAA-approved Flight Manual or as otherwise specified by the Administrator. The airworthiness certificate allows small unmanned aircraft operations for compensation and hire.” The requirements are a good read and recommended for pilots who wish to qualify for Category 4 operations.
How does the FAA calculate Kinetic Energy?
The FAA’s Circular 107-2A page 8-15 provides this formula for calculating the kinetic energy in foot-pounds:
KE = 0.0155 x drone weight (in lbs) x (velocity in mph)²
For example, a DJI Mavic 2 drone weighs about 2 lbs and its terminal velocity is about 45 mph. (Source: MavicPilots forum.) Using these numbers, the KE of a Mavic 2 in terminal velocity (free fall) is calculated to be 63 ft-lbs. Therefore, velocity would have to be reduced to less than 19 mph to comply with Category 2 operations – that is 11 foot-pounds. This number means that you will have to fly low and slow.
Night Operations
This new rule also allows routine operations of small aerial drones at night under two conditions:
- The remote pilot in command must complete an updated initial knowledge test or online recurrent training.
- The aerial drone must have lighted anti-collision lighting visible for at least three (3) statute miles that has a flash rate sufficient to avoid a collision.