FAR 103.5 — Ultralight Waivers

FAR 103.5 is short but important: if you want to operate an ultralight vehicle in any way that doesn't comply with Part 103, you must first get a written waiver from the FAA Administrator.

In plain terms:

• Part 103 sets the operating rules for ultralights (single-occupant, weight limits, daylight operations, no congested areas, etc.).
• If your planned operation breaks any of those rules — for example, a night demonstration flight, an airshow over a crowd, or a two-seat training exception — you cannot just do it.
• You must apply for and receive a written waiver before the flight.
• Verbal approval, controller permission, or assumed authorization does not count.

Why it matters operationally: Part 103 is already permissive (no pilot certificate or aircraft registration required), so the FAA expects strict compliance with the few rules that do apply. Operating outside those rules without a waiver makes the flight illegal and exposes the pilot to enforcement action.