Definition
The radio frequency assigned by ATC for communication with departure control, the radar facility that handles aircraft after takeoff until they are handed off to the next controlling agency, typically an air route traffic control center.
Plain English
The radio channel a pilot switches to right after takeoff so the radar controller responsible for outbound traffic can guide them away from the airport area.
Context Anchor
A pilot may receive this frequency in the pre-takeoff instructions, from the tower, or as part of an instrument departure briefing.
Why Pilots Care
It keeps departing traffic safely separated from arrivals and other departures while you are still low and close to the airport.
Intuition Check
Do not read “frequency” here as “how often departures happen.” In this context, it means a specific radio channel used to talk with departure control.
Example Sentence 1
After takeoff, the tower instructed the pilot to contact departure control frequency on 124.35.
Example Sentence 2
The pilot switched to the published departure control frequency and received a heading to join the departure route.