The U.S. aircraft register, updated daily
Approved modifications · supplemental type certificate · current · reissued

SA1834WE

Modification and installation of70 ampere Motorola Model SA 70N-24 alternator (Vasquez P/N FMM-1002) system. Held by West Glenn N. Last revised October 31, 1984. System: electrical power.

What it applies to

Kind of product
Aircraft
Design holder
Ayres Corporation; Ayres Corporation; Ayres Corporation; Ayres Corporation; Ayres Corporation
Models
600-S2C, S2R, 600 S-2D, S2R, 600 S2D
Type certificates
2A7, A3SW, A3SW, A4SW, A4SW
On this site
Ayres Corporation S-2 244 registered
Snow 600 7 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 21, 2026.