Foundations · Lesson 4 of 4

Small unmanned aircraft: what actually counts

Drone / Part 107 Ground School

Mission Brief

A small unmanned aircraft weighs less than 55 pounds at takeoff, including everything attached to it, not just the bare airframe.

At a Glance

Max Takeoff Weight< 55 lbs

A small unmanned aircraft system (sUAS) under Part 107 is any drone weighing less than 55 pounds at takeoff, including everything attached to it: cameras, sensors, batteries, propeller guards, or other attached equipment. Most consumer and prosumer drones fall well under this limit, but the legal definition, not the marketing description, is what actually determines whether Part 107 applies.

Why This Matters

Many drones are advertised as "small," but that’s a marketing description, not a legal one. The FAA looks at the aircraft as it will actually take off, not the bare airframe weight printed on a spec sheet. A heavy payload or specialized equipment can change an aircraft’s total takeoff weight even when the drone itself seems light, which is exactly why knowing the correct number matters more than trusting a product listing.

Watch Out

"Only the drone itself counts toward the weight." Incorrect. The FAA looks at the aircraft as it will take off. If something is attached during flight, cameras, sensors, propeller guards, spray equipment, it’s part of the takeoff weight.

From the Field

A survey company upgrades one of its drones with a larger battery and a heavier LiDAR sensor before an inspection flight. The aircraft flew legally yesterday. Today’s configuration is different, and the pilot has to think about the aircraft as it will actually take off today, not as it came out of the box or how it was configured on a previous job.

For most recreational and photography drones, this calculation rarely comes up. For specialized commercial rigs, checking current takeoff weight against the 55-pound threshold is part of normal preflight planning, not a one-time fact to memorize and forget.

✈️

Mission Brief

You’re preparing for an aerial mapping mission. Your aircraft weighs 51 pounds. The camera system you’re attaching for this job weighs 6 pounds.

What do you do? Tap each option to see why it works or doesn’t.

Key Takeaways

  • A small unmanned aircraft weighs less than 55 pounds at takeoff.
  • Total weight includes everything attached to the aircraft during flight.
  • The FAA’s legal definition matters more than a product’s marketing description.
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