EASA SIB 2011-03: Advisory Vertical Guidance

What to do

Pilots and operators of General Aviation aircraft equipped with advisory vertical guidance systems should continue to use the primary barometric altimeter as the main altitude reference and exercise caution when using advisory vertical guidance. They should avoid reliance on these systems where display or annunciation is inadequate and ensure that any approach procedures with vertical guidance are only flown if the aircraft and systems are approved and authorized. No mandatory compliance deadlines are specified.

Summary

EASA Safety Information Bulletin SIB No. 2011-03 titled Advisory Vertical Guidance addresses the use of advisory vertical guidance systems in General Aviation aircraft during Non Precision Approaches. It explains that such guidance may be based on GNSS, SBAS augmentations like EGNOS or WAAS, barometric altimetry, or other means, but these systems are not approved for official vertical guidance. The bulletin applies specifically to General Aviation aircraft equipped with advisory vertical guidance systems.

What changed

This new EASA Safety Information Bulletin introduces guidance regarding the use and limitations of advisory vertical guidance systems in General Aviation. It clarifies that these systems have not been assessed for airworthiness or operational credit and do not provide approved vertical guidance. The bulletin also highlights potential issues with display, annunciation, and barometric altimetry variations that could affect approach safety.

Why it matters

This bulletin is important for aviation professionals because it emphasizes that pilots must rely on the primary barometric altimeter for altitude compliance during approaches, maintaining responsibility for obstacle clearance. It informs operators and pilots that advisory vertical guidance is optional and not approved, which affects operational decision-making and safety management. Understanding these limitations helps ensure compliance and safe operation during Non Precision Approaches in General Aviation.