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

SA2512WE

Relocation of speed-logic control unit of GTCP36-6 turbine auxiliary power unit and mounting provisions for spare speed-logic unit. Held by Airesearch Aivation Service CO, which holds 157 approved modifications in all. Last revised May 12, 1972. System: engine.

What it applies to

Kind of product
Aircraft
Design holder
Gulfstream Aerospace Corporation
Models
G-1159
Type certificate
A12EA
On this site
Gulfstream G-1159 Gulfstream II and III 42 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.