Definition
SVFB is an ICAO service designator used in aeronautical fixed telecommunication network (AFTN) routing to identify a specific class of interphone service. It appears in operational documents and routing tables to indicate the type of voice circuit service in use between fixed aeronautical stations.
Plain English
A code that labels a particular kind of voice circuit between fixed aviation communication stations on the ground.
Context Anchor
Seen in FAA acronym, abbreviation, and NOTAM contraction lists, especially when decoding short forms used in aviation notices.
Derivation
SV comes from 'service' and FB identifies the specific interphone category in the ICAO classification scheme. The grouping reflects ICAO's standardized two-letter service codes used worldwide in fixed aeronautical communications.
Why Pilots Care
Tells the pilot whether a needed interphone link exists before departure or arrival.
Intuition Check
Do not read “interphone” as the aircraft passenger intercom or the radio frequency you transmit on. Here it means a designated FAA voice link between aviation facilities.
Example Sentence 1
The routing manual listed SVFB as the interphone service category for that ground communication link.
Example Sentence 2
Checking the abbreviations confirmed SVFB meant the required communication service was active.