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

SG4-1240

Installation of Eonnex cover on aircraft surfaces. Held by Ceconite, INC, which holds 4 approved modifications in all. Last revised August 19, 1980. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
Laister-Kauffmann Aircraft Corporation; Laister-Kauffmann Aircraft Corporation; Miscellaneous; Nelson Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation; Schweizer Aircraft Corporation
Models
LK-10B, LK-10A (Army TG-4A), Miscellaneous, BB-1, SGS 1-26C, SGS 1-26B, SGS 1-26A, SGS 1-26, SGU-1-19, SGU-1-19A, SGU 2-22EK, SGU 2-22E, SGU 2-22C, SGU 2-22B, SGU 2-22A, SGU 2-22, SGU 2-22CK, SGS 2-8, SGS 2-8A
Type certificates
G-15, G-15, Miscellaneous, GTC 19, 1G10, 1G10, 1G10, 1G10, G-17, G-17, G-18, G-18, G-18, G-18, G-18, G-18, G-18, GTC 5, GTC 5
On this site
Laister-Kauffman LK-10 12 registered
Schweizer SGS 1 gliders (1-26, 1-34, 1-35, 1-36) 581 registered
Schweizer SGS 2 gliders (2-33 and 2-32) 275 registered
Schweizer SGU-1 20 registered
Schweizer SGU 2 74 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 22, 2026.