SA4465NM
Installation of speed ring. (S2R-R1820 S/N R1820-001DC AND UP). Held by Serv-Aero Engineering INC, which holds 32 approved modifications in all. Last revised September 29, 1982. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Ayres Corporation; Ayres Corporation
- Models
- S2R, S2R-R1820
- Type certificates
- A4SW, A4SW
- 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 5, 2026.