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

SA791CE

Installation of either of the following electronic synchronizer kits P/N 213521 or P/N 213517. Held by Ontic Engineering and Manufacturing INC., which holds 59 approved modifications in all. Last revised April 30, 2007. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
Israel Aircraft Industries Ltd.; Israel Aircraft Industries Ltd.; Israel Aircraft Industries Ltd.; Israel Aircraft Industries Ltd.
Models
1121, 1121A, 1121B, 1123
Type certificates
A2SW, A2SW, A2SW, A2SW
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.