SE27WEOther aircraft modifications
Installation of two Bendix-Stromberg Model PS-5C carburetors.
FAA holder: AvComp LLC
Aircraft STC directory
Pratt & Whitney Division R-985 Series STCs
The Jun 30, 2026 FAA DRS snapshot contains 5 selected supplemental type certificates with status Current whose public applicability data names the Pratt & Whitney Division R-985 Series. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
5
listed Current at snapshot
3
holder directories
2
modification categories
Nov 8, 2025
latest recorded revision
Modification demand surface
Other aircraft modifications3
Engine and powerplant2
Recently revised R-985 Series STCs
Showing the 5 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
SE31WEEngine and powerplant
Installation of Electro-Coatings, Inc. piston rings P/N 251822, 251824, and 251825 on Pratt and Whitney R-985 piston P/N 27056 for use with Channelcromium plated R-985 engine cylinders.
FAA holder: Continental Motors, Inc.
SE8776SWOther aircraft modifications
Installation of coated cylinders and piston rings.
FAA holder: Continental Motors, Inc.
SE1-391Engine and powerplant
Pratt & Whitney R-985 engine and ATI fuel injection.
FAA holder: Staggerwing Museum Foundation Inc.
SE4-864Other aircraft modifications
Increase in impeller drive ratio from 10:1 to 12:1.
FAA holder: Covington Aircraft Engines, Inc.