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

SA2098SO

Installation of a pneumatic squat switch on the landing gear retraction system. Held by Swift Museum Foundation INC, which holds 7 approved modifications in all. Last revised August 20, 2018. System: landing gear.

What it applies to

Kind of product
Aircraft
Design holder
Swift Museum Foundation Inc.; Swift Museum Foundation Inc.
Models
GC-1B, GC-1A
Type certificates
A-766, A-766
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 20, 2026.