# STC SG4309NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Burt Donald M, United States
- Description: Recover the flaps using large flange Pop Rivets (AD42ASLF) instead of wire lacing to secure the fabric to the leading edge structure.
- Applied: May 15, 1987
- Status date: April 8, 1988
- Product: Aircraft, Glider
- Certification basis: Part 21
- Data sheets: [TCDS G24EU](https://openairdocs.org/tcds/G24EU)
- Certificate PDF: https://openairdocs.org/files/sha256/2f/a7/2fa765536562f137e5cde0bb337d83ba10bd7ae75ef01e738ec230f4076d3c4f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/98AB2DDDE372246985256CC2005C2DBD.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SG4309NM

## ADs that name it (0)

None.

## Approved models (1)

- LET Aeronautical Works L-13 "Blanik" ([TCDS G24EU](https://openairdocs.org/tcds/G24EU))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SG4309NM This certificate issued to: Donald M. Burt Purt 21.29 of the Federal Aviation Pugulatina Effective February 1, 1965.

Original Product - TypoCrificate Number: G24EU Make: LET n.P• Model: L-13 (Blanik) Description of Type Design Change:

Recover the flaps using large flange Pop Rivets (AD42ASLF) instead of wire lacing to secure the fabric to the leading edge structure in accordance with Donald M. Burt Drawing No. DMB-1 dated April 7, 1988, or later FAA Approved Revision.

Note: The flaps must be recovered using the Stits process per STC SA1008WE.

Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the relationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate must be maintained as

Date of Application: May 15, 1987 Date Reissued:

Date of Issuance: April 8, 1988 Date Amended:

FEDERAL AVIATION Signature TAHINIST RATO Assistant Manager, Seattle Aircraft Certification Office (Title)

## Every issue (1)

- April 8, 1988: Issued, Current. [certificate](https://openairdocs.org/files/sha256/2f/a7/2fa765536562f137e5cde0bb337d83ba10bd7ae75ef01e738ec230f4076d3c4f)

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