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FAA-listed STC holder

Keystone Helicopter Corp. STCs

The Jun 30, 2026 FAA DRS snapshot lists 8 selected supplemental type certificates with status Current under Keystone Helicopter Corp.. The records span 7 public aircraft directories and 5 modification categories. This is a research directory, not a claim that any specific kit or service is currently offered.

8
listed Current at snapshot
7
aircraft directories
5
modification categories
Sep 4, 2009
latest recorded revision

Modification mix

Cabin and interiors3
Avionics2
Electrical systems1
Propellers1
Other aircraft modifications1

Aircraft represented

Sikorsky Aircraft S-76C226 STCsSikorsky Aircraft S-76A173 STCsSikorsky Aircraft S-76B169 STCsSikorsky Aircraft S-92A118 STCsPilatus Aircraft PC-12/45108 STCsSikorsky Aircraft S-61N89 STCsEurocopter France SA341G24 STCs

Recently revised records

Showing the 8 most recently revised records. Category directories provide the complete paginated discovery path.