Definition
A formal request submitted to the FAA or a communications service provider to establish, modify, or discontinue a specific aeronautical communications service, such as a radio frequency, datalink connection, or ground communications facility supporting air traffic operations.
Plain English
A paperwork request asking the FAA to set up, change, or remove a particular communications service used in aviation — like a radio frequency or a data link.
Context Anchor
Seen in FAA acronym, abbreviation, and NOTAM contraction lists, and sometimes in airport or FAA communication-support documents.
Why Pilots Care
Most pilots will never file one, but it helps to recognize the term when it appears in NOTAMs or FAA notices announcing changes to a frequency or communications facility.
Intuition Check
Do not read CSR as a radio call or a clearance. Here, it means a request for communication service support.
Example Sentence 1
The new approach frequency at the regional airport went live after the FAA processed the communications service request.
Example Sentence 2
After the CSR was approved, reliable voice communications were available throughout the flight.