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SEA Metroliner Cockpit Avionics Modernization

SEA recently completed a major cockpit avionics modernization program on a SA 227 Metroliner.

Removed equipment included an early generation EFIS, many electromechanical and pneumatic instruments, and older communication and navigation equipment. Through the use of five STCs and FAA DER approved data, SEA installed a complete new Garmin avionics package in an SEA manufactured custom instrument panel.


Dual Garmin G700 TXi EFIS Systems with GDU 1060s Garmin TAWS-B Garmin GTN 750 Xi and GTN 650 Xi GPS/NAV/COMs Garmin GTS 855 TCAS I Active and ADS-B In Traffic System Garmin GWX 75 Weather Radar This new avionics suite has full integration with the existing autopilot, radar altimeter, FDR, and other retained avionics and aircraft systems.

For audio distribution, SEA utilized the new PS Engineering PAC 45A audio system bringing 12 place passenger intercom with cabin call functionality, CVR integration, 3D audio, and more.

SEA also installed the Mid-Continent Instruments MD 302 SAM, Electronic Standby Instrument to provide a reliable redundant flight instrumentation source if a major electrical failure happens during flight.

This upgrade brings major improvements to situational awareness and avionics relevance, allowing the aircraft to fly for many more years to come.

For more information regarding SEA aircraft modification solutions please contact Luke Gomoll,

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