Skip to content

FAA-listed STC holder

Preferred Improvements LLC STCs

The Jun 30, 2026 FAA DRS snapshot lists 22 selected supplemental type certificates with status Current under Preferred Improvements LLC. The records span 14 public aircraft directories and 8 modification categories. This is a research directory, not a claim that any specific kit or service is currently offered.

22
listed Current at snapshot
14
aircraft directories
8
modification categories
May 22, 2024
latest recorded revision

Modification mix

Other aircraft modifications12
Landing gear and brakes3
Cargo and special mission2
Fuel systems1
Aircraft connectivity1
Aircraft structures1
Safety and emergency equipment1
Flight controls1

Aircraft represented

Boeing DC3C-S4C4G91 STCsBoeing DC3C-S1C3G90 STCsBoeing DC3C-SC3G88 STCsBoeing DC3C-R-1830-90C87 STCsBoeing DC3A-S1C3G70 STCsBoeing DC3A-SC3G68 STCsBoeing DC3A-S1CG66 STCsBoeing DC3D-R-1830-90C65 STCsBoeing DC3A-SCG65 STCsBoeing DC3A-S4C4G64 STCsBoeing DC3-G10255 STCsBoeing DC3-G102A55 STCsBoeing DC3-G103A55 STCsBoeing DC3-G202A55 STCs

Recently revised records

Showing the 22 most recently revised records. Category directories provide the complete paginated discovery path.