Definition
A NOTAM contraction used by the FAA to report that 'interphone service F' at a specific airport or facility is out of service. The trailing '(D)' indicates 'decommissioned' or 'out of service' status in NOTAM shorthand. Interphone services are dedicated voice circuits that link air traffic control facilities, airport operations, and other aviation entities for coordination purposes.
Plain English
A short code that appears in NOTAMs to tell pilots that one of the dedicated phone lines used between aviation facilities — specifically 'interphone service F' — is not working.
Context Anchor
Seen in acronym, abbreviation, and NOTAM contraction lists, especially where communication services or outages are being described.
Derivation
NOTAM contractions are deliberately compressed to fit message length limits. 'SVF' stands for 'service F' (one of several interphone service designations), and the '(D)' tag is the standard NOTAM marker for a decommissioned or down service.
Why Pilots Care
Most line pilots will not act directly on an interphone outage — it affects facility-to-facility coordination rather than cockpit operations — but it can hint at degraded coordination between ATC units and is part of the broader picture of what's working and what isn't at a given facility.
Intuition Check
Do not read “interphone” as an onboard passenger intercom. Here it means a ground communication link used between aviation facilities.
Example Sentence 1
While reviewing NOTAMs for the destination, the dispatcher noted 'SVFD' and confirmed it referred to an out-of-service interphone line at the tower.
Example Sentence 2
The preflight briefing referenced SVFD to confirm the interphone service status.