AIM Text
- The majority of unmanned free balloons currently being operated have, extending below them, either a suspension device to which the payload or instrument package is attached, or a trailing wire antenna, or both. In many instances these balloon subsystems may be invisible to the pilot until the aircraft is close to the balloon, thereby creating a potentially dangerous situation. Therefore, good judgment on the part of the pilot dictates that aircraft should remain well clear of all unmanned free balloons and flight below them should be avoided at all times.
- Pilots are urged to report any unmanned free balloons sighted to the nearest FAA ground facility with which communication is established. Such information will assist FAA ATC facilities to identify and flight follow unmanned free balloons operating in the airspace.
Source: FAA Aeronautical Information Manual · current edition · paragraph 7-6-5.
The short answer
This AIM section is FAA advisory guidance warning pilots to avoid flying beneath unmanned free balloons. Many carry suspension devices, payload packages, or trailing wire antennas that can be invisible until very close, creating a hazard. The FAA advises remaining well clear and reporting sighted balloons to the nearest FAA ground facility to aid ATC flight following.
Research Notes
Common Questions
Why is flying below an unmanned free balloon dangerous?
The AIM explains most unmanned free balloons have, extending below them, either a suspension device holding the payload or instrument package, or a trailing wire antenna, or both. In many cases these balloon subsystems may be invisible to the pilot until the aircraft is close to the balloon, creating a potentially dangerous situation. Good judgment dictates aircraft remain well clear of all unmanned free balloons and avoid flight below them at all times.
Should I report an unmanned free balloon I see in flight?
Yes. The AIM urges pilots to report any unmanned free balloons sighted to the nearest FAA ground facility with which communication is established. This information assists FAA ATC facilities in identifying and flight following unmanned free balloons operating in the airspace.