SA01420SE

Install a Walter M601-E11 or M601-D11 engine and Avia V508-E-AG 106/A propeller per Cascade Aircraft Conversions Master Drawing List FW-CAC090-90 Revision B, dated August 10, 2004, and Cascade Aircraft Conversions Document FW-CAC090-12, Revision IR, dated June 2, 2004, Installation Manual for Thrush Aircraft S2R Series, Walter Turbine Installation or later FAA approved revisions to either of these documents. Held by Cascade Flying Service LLC, which holds 7 approved modifications in all. Last revised March 23, 2018. System: propeller.

What it applies to

Kind of product: Aircraft
Design holder: Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.
Models: S-2R, S2R-R1340, S2R-R1820, S2R-R3S
Type certificates: A4SW, A4SW, A4SW, A4SW
On this site: Ayres Corporation S-2 244 registered
Thrush Aircraft Inc S-2 102 registered
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 22, 2026.