Broadcasts

Definition

In aviation, a broadcast is a one-way radio transmission intended for all aircraft within a specific area rather than a single station. Unlike directed transmissions (e.g., tower-to-aircraft), broadcasts are general announcements and do not require or expect a response.

Purpose

Broadcasts are used to:

Provide situational awareness to all pilots in the vicinity
Share non-selective information, such as traffic, weather, or airspace status
Replace ATC instructions in uncontrolled airspace or where no ATC is present

Common Types of Broadcasts

Type	Content	Where Used
Traffic Information Broadcasts	Position reports, intentions	Non-towered aerodromes, RMZ
Weather Broadcasts (VOLMET)	En-route weather updates	On designated frequencies
ATIS	Automated airport information	Controlled airports
Hazard Warnings	Temporary dangers, bird activity, parachuting	On local or FIS frequencies
Information Broadcast by FIS	General airspace updates	Class E/G, advisory areas

Phraseology Examples

“All stations, this is Vöslau Information: parachuting in progress at drop zone 3.”
“All stations, Linz traffic, D-EMFG entering left downwind runway 08.”
“All stations, bird activity reported at Salzburg, 500 ft AGL, vicinity of the threshold runway 15.”

When and How to Broadcast

Pilots are expected to broadcast when:

Operating in uncontrolled airspace (Class G)
Entering or crossing an RMZ (Radio Mandatory Zone)
Approaching or departing non-towered aerodromes
Performing position reports en route in remote areas

Key elements to include:

Call sign
Position
Altitude
Intentions
Relevant time or heading info

Example:
“All stations, D-ABCD, overhead Krems at 2500 feet, descending to join right downwind runway 11.”

Do’s and Don’ts

✅ Keep it brief and clear
✅ Use standard phraseology
✅ Include only essential information
❌ Do not expect a reply
❌ Do not use slang or regional dialect

Note

Broadcasts do not replace ATC instructions where ATC is available. They are intended for self-separation and coordination in shared airspace without active control.