SA10236SC (1 OF 4)Other aircraft modifications
Installation of a GDC 31 Roll Steering Converter.
FAA holder: DAC International Inc
Aircraft STC directory
Alliance Aircraft Group H-391 (USAF UL-24) STCs
The Jun 30, 2026 FAA DRS snapshot contains 9 selected supplemental type certificates with status Current whose public applicability data names the Alliance Aircraft Group H-391 (USAF UL-24). Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
9
listed Current at snapshot
5
holder directories
4
modification categories
Jul 17, 2020
latest recorded revision
Modification demand surface
Other aircraft modifications5
Aircraft connectivity2
Avionics1
Engine and powerplant1
Recently revised H-391 (USAF UL-24) STCs
Showing the 9 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
SA01800SE (PG 2)Avionics
Fabrication and installation of new or replacement of existing instrument panel lights dimmer control.
FAA holder: Seaton Engineering Corp.
SA01861SE (PAGE 2)Other aircraft modifications
Fabrication and installation of Landing Light Controller.
FAA holder: Seaton Engineering Corp.
SA01473SE (3 OF 5)Other aircraft modifications
Installation of a GTX 32 (mode C), GTX 33 (mode S), or GTX 33D (mode S with diversity) Remote Transponde.
FAA holder: Garmin AT Inc.
SA01487SE (5 OF 5Aircraft connectivity
Installation of a GDL 69 or GDL 69A XM Satellite Receiver in accordance with Garmin Supplemental Type Certificate Master Data List, P/N 005-C0217-00, Revision A, dated December 20, 2004, or later FAA approved revision.
FAA holder: Garmin AT Inc.
SA00680SE (5 OF 6Engine and powerplant
Installation of Electronics International model UBG-16 or UBG-16T bar graph engine analyzer.
FAA holder: Electronics International
SA01487SE (2 OF 5)Aircraft connectivity
Installation of a GDL 69 or GDL 69A XM Satellite Receiver in accordance with Garmin Supplemental Type Certificate Master Data List, P/N 005-C0217-00, Revision A, dated December 20, 2004, or later FAA approved revision.
FAA holder: Garmin AT Inc.
SA02217AK (1 OF 5)Other aircraft modifications
Installation of Garmin AT Model GDL90 UAT Data Link System, in accordance with Garmin AT, Inc., GDL 90 UAT Master Data List, P/N 560-0278-01, Revision A, dated November 12, 2004, or later FAA approved revision.
FAA holder: Garmin AT Inc.
SA02655AT (1 OF 2)Other aircraft modifications
Installation of JAARS Model F5K Automatic Flight Following System (AFFS) in Helio H-295 type aircraft.
FAA holder: JAARS Inc.