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. Held by Continental Motors, INC., which holds 57 approved modifications in all. Last revised October 31, 2016. System: engine.
What it applies to
- Kind of product
- Engine
- Design holder
- Pratt & Whitney Division; Pratt & Whitney Division; Pratt & Whitney Division; Pratt & Whitney Division; Pratt & Whitney Division; Pratt & Whitney Division; Pratt & Whitney Division; Pratt & Whitney Division; Pratt & Whitney Division
- Models
- Military R-985 Series, R-985 Series, Wasp Jr. B-4, Wasp Jr. B-5, Wasp Jr. SB-2, Wasp Jr. SB-3, Wasp Jr. Series, Wasp Jr. T1B2, Wasp Jr. T1B3
- Type certificates
- TC 5E-1, 5E-1, E-123, E-123, E-123, E-123, E-123, E-123, E-123
- The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 20, 2026.