SA4108WE
Installation of second pilot s seat and dual controls or passenger/cargo compartment in accordance with Serv-Aero Engineering, Inc. FAA sealed Master Drawing List MDL 020280, dated February 2, 1980, or later FAA approved revision. UACL PT6A-34A engine is required with this installation. FAA Approved Serv-Aero Airplane Flight Manual No. 022280 dated March 17, 1980 is required with this installation. (S2R S/N 2526R AND UP MODIFIED BY STC SA3237WE) (S2R-T34 S/N 6009-6049, S/N T34-001 AND UP). Held by Thrush Aircraft INC., which holds 16 approved modifications in all. Last revised July 30, 2003. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Ayres Corporation; Ayres Corporation
- Models
- S-2R, S2R-T34
- Type certificates
- A3SW, A3SW
- On this site
- Ayres Corporation S-2 244 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 8, 2026.