FAA Regulation

the Remote PIC.  the controlling agency. Air Traffic Control.

Only when the operator will be paid for commercial services. All civilian small UAs weighing greater than .55 pounds must be registered regardless of its intended use.  When the small UA ...

Continue the mission, airplanes are not allowed to fly lower than 500 feet AGL unless around an airport. Give way and stay clear from the crop duster.   Continue the mission, ...

No, 14 CFR Part 107 only applies to sUAS weighing less than 0.55 lbs. Yes, there is no lower weight limit for operating under 14 CFR Part 107.   No, roof ...

The owner of the aircraft. The operator of the aircraft. The manufacturer of the aircraft.

With the controlling agency’s authorization.   Regulations do not allow this. When flying on airways with an ATC clearance.

visual observer. remote pilot-in-command.  owner of the small UAS.

It must not contain exposed rotating parts that can lacerate.  It must not contain exposed rotating parts that can lacerate and must not cause injury equivalent to 11 ft-lb of kinetic energy.