Above 200 Feet: The Aircraft Isn't the Hard Part. The Hose Is.

Part 107 generally permits flight up to 400 feet above ground level. Its structure rule can allow a drone to operate higher when it remains close to a structure and no more than 400 feet above that structure's immediate uppermost limit. That does not erase controlled-airspace authorization, visual-line-of-sight, people, weather, or site-control requirements.

Allowed altitude and authorized airspace altitude are different numbers. A building may be physically reachable while the surrounding airspace, launch area, or line of sight still makes the mission a no-go.

The under-55-pound definition includes everything attached. For a cleaning system, the calculation cannot stop at the dry aircraft. The supported hose, liquid inside it, fittings, nozzle, and any power tether all affect the operating configuration.

Static weight is only the start. Wind creates drag. A roof edge creates friction. A bend or snag can produce a sudden side load. Spray reaction and moving water change handling. A scale can prove one number on the ground; it cannot prove controllability in the air.

A manufacturer-approved, rated support point can relieve some static hose load. It can also introduce anchor failure, abrasion, tension, snag, façade damage, and emergency-descent problems. The goal is hose-load relief, not hanging a counterweight on the aircraft. An aircraft-mounted counterweight only adds mass.

No improvised roof-edge knots. A real plan needs manufacturer approval, property permission, a rated anchor or management system, abrasion protection, a predictable release path, and a site-specific job safety analysis. A tie-off does not magically remove an attached hose from the FAA analysis.

The current Apellix B2 published reach is up to 195 feet. SkyPSI does not round that to 200 or pretend a brochure number settles the job. Work above the published configuration requires a different engineering and regulatory answer, and an operating weight of 55 pounds or more leaves the ordinary Part 107 path.

Height is not a marketing number. It is a configuration the crew proves before takeoff: aircraft, hose, water, support method, airspace, visual line of sight, exclusion zone, weather, and recovery plan.