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

SS487CH

Installation of Cooper Superflite102 fabric. Held by Aviation Products Systems INC., which holds 15 approved modifications in all. Last revised July 9, 2002. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
Lockheed Martin Tactical Defense Systems; Lockheed Martin Tactical Defense Systems; Westinghouse Airships Inc.
Models
GZ-20A, GZ-22, Skyship 600
Type certificates
1, AS1GL, AS1EU
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.