EASA SIB CE-17-19
Sandia SAE5-35 and Garmin GAE 43 Cabin Altitude Encoders — Installation Evaluation
Summary
The Special Airworthiness Information Bulletin SAIB: CE-17-19 is an FAA information bulletin addressing installation concerns for the Sandia SAE5-35 and Garmin GAE 43 cabin altitude encoders used in various airplanes. It highlights potential airworthiness issues related to certain installation configurations of these encoders, which provide altitude data to avionics displays. The bulletin does not apply to any specific aircraft model but references installations on Piper airplanes in related investigations.
What Changed
This bulletin introduces a recommendation for owners and operators to evaluate the installation configuration of the Sandia SAE5-35 and Garmin GAE 43 cabin altitude encoders. It highlights improper installation practices, such as mounting the encoder upside down behind the instrument panel without adequate retaining fasteners, which could pose safety risks. Sandia has updated its installation manual and designed an alternate mounting assembly to mitigate these risks.
Why It Matters
Proper installation of cabin altitude encoders is critical to ensure they do not interfere with flight control systems, as improper installations have been linked to control system jamming incidents. Aviation professionals, including operators and maintenance personnel, need to be aware of these risks to prevent potential safety hazards and maintain compliance with airworthiness standards. Evaluating and correcting installations can help avoid unsafe conditions and costly repairs.
What To Do
Owners and operators should review the installation configuration of their Sandia SAE5-35 or Garmin GAE 43 cabin altitude encoders, using the bulletin's background information as guidance. They are encouraged to consider using the alternate mount assembly described in the revised Sandia installation manual to prevent improper installations. No mandatory compliance deadline is specified, but prompt evaluation is recommended.