FAA · Supplemental Type Certificate
STC SE31WE
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
What is an STC?
A Supplemental Type Certificate authorizes a major modification or alteration to an FAA-certificated aircraft. STCs are how operators legally install new avionics, change fuel systems, add floats, swap engines, etc. — every change beyond a minor modification needs one.
Applicable aircraft (9)
- TC 5E-1 Pratt & Whitney Division · Military R-985 Series
- 5E-1 Pratt & Whitney Division · R-985 Series
- E-123 Pratt & Whitney Division · Wasp Jr. B-4
- E-123 Pratt & Whitney Division · Wasp Jr. B-5
- E-123 Pratt & Whitney Division · Wasp Jr. SB-2
- E-123 Pratt & Whitney Division · Wasp Jr. SB-3
- E-123 Pratt & Whitney Division · Wasp Jr. Series
- E-123 Pratt & Whitney Division · Wasp Jr. T1B2
- E-123 Pratt & Whitney Division · Wasp Jr. T1B3
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗