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.

listed Current at snapshot

holder directories

modification categories

Nov 8, 2025

latest recorded revision

Modification demand surface

Other aircraft modifications3 Engine and powerplant2

Recorded holders

Continental Motors, Inc.2 AvComp LLC1 Staggerwing Museum Foundation Inc.1

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.

SE27WEOther aircraft modificationsRevised Nov 8, 2025

Installation of two Bendix-Stromberg Model PS-5C carburetors.

FAA holder: AvComp LLC

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SE31WEEngine and powerplantRevised Oct 31, 2016

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.

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SE8776SWOther aircraft modificationsRevised Oct 31, 2016

Installation of coated cylinders and piston rings.

FAA holder: Continental Motors, Inc.

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SE1-391Engine and powerplantRevised Oct 6, 2006

Pratt & Whitney R-985 engine and ATI fuel injection.

FAA holder: Staggerwing Museum Foundation Inc.

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SE4-864Other aircraft modificationsRevised Dec 28, 2001

Increase in impeller drive ratio from 10:1 to 12:1.

FAA holder: Covington Aircraft Engines, Inc.

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