Flight RulesAir Traffic Services

Surveillance Information Service (SIS)

A Surveillance Information Service (SIS) is an on-request service provided to VFR flights in Class E and G airspace that are within ATS surveillance system coverage. Pilots receiving this service are provided with traffic information, an alerting service, and, on request, position or navigation information.

Key Points

  • •Available subject to ATC workload and requires direct VHF communication.
  • •Aircraft must be equipped with a serviceable SSR transponder or ADS-B transmitter.
  • •Information is advisory in nature; the pilot remains responsible for separation and terrain clearance.

Exam Relevance

Pilots must know what services are available in Class E and G airspace and how to properly request them from ATC using a transponder or ADS-B.

Related Terms

flight information serviceclass e airspaceclass g airspace

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Surveillance Information Service (SIS) | The Pilot Exam