Southeast Aerospace

Summer 2021 Newsletter

SEA Hangar

Douglas A-4N Fleet Cockpit Upgrade

SEA Aircraft Modifications

Southeast Aerospace recently completed the prototype installation of a major avionics modification for a fleet program on the Douglas A-4N Skyhawk airframe. SEA designed the structural mounting, electrical interface, and existing systems interface for the installation of the new avionics equipment in the aircraft.

Of note is the in-house, custom made, half inch thick instrument panel. The instrument panel was milled out of a strong aluminum alloy to meet the structural requirements of the aircraft. Newly installed Garmin equipment included:

  • GDU 700P Primary Flight Display
  • GTX 345R Remote Mount ADS-B In/Out Transponder
  • GI 275 Attitude Indicator
  • GRS 7800 AHRS and GDC 7400 ADC
A4N Aircraft

Replacing older generation digital and analog avionics, SEA installed a GDU 700P which provided a large, bright touchscreen PFD. The GTN 650Xi brings rich FMS capabilities along with VHF NAV/COM, a GTX 345DR fulfills ADS-B In & Out with transponder diversity, while a GI-275 provides standby reliability. The high performance GRS7800 AHRS and GDC 7400 ADC are well-suited to feed the new EFIS in this high performance airframe. This Navigation, Communication, and EFIS Upgrade Program brings much needed avionics and instrument reliability back to this airframe while also supplying new safety enhancing features.

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

A4N Panel Before & After

Third Sikorsky S76C+ Avionics Modification Completed

SEA Sikorsky Install

These S76C+ upgrades bring major improvements to situation awareness and safety through the advanced rotorcraft features of the Garmin GTN 750. The high-resolution terrain and obstacle databases show great detail and alerts for ground-based dangers at the current position and the projected future position. ADS-B Out and In simple control and display all on the GTN 750. The Honeywell SkyConnect system brings cockpit and cabin voice connectivity along with aircraft tracking capability. Easy flight plan modification on the fly, autotuned Com and Nav frequencies, and even a significant reduction in aircraft weight. These are just a few of the added benefits included in these installations.

SEA utilized STC SR03573NY from Maxcraft Avionics Ltd. For installation of the Garmin GTN 750s. SEA’s own Part 29 AML ADS-B STC SR00925DE was utilized for installation of the remote GTX 345R ADS-B transponder. FAA approved DER data was used to accomplish the SkyConnect system installation and any STC deviations.

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