# STC SA2-611

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Sierra Industries, Inc, United States
- Description: Modification of wing flap cylinder to incorporate O ring seals.
- Applied: July 30, 1958
- Status date: December 1, 1999
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS LTC AL-13](https://openairdocs.org/tcds/LTC%20AL-13)
- Certificate PDF: https://openairdocs.org/files/sha256/b3/98/b3985fe98e66dedfade201cb0bc2a215a9199bcc4c3d9e2e30db9590df23bb73
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CBE2C27E25D9F0B585256CC10083D4B8.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2-611

## ADs that name it (0)

None.

## Approved models (1)

- Air Trading Corporation Navy PV-1 ([TCDS LTC AL-13](https://openairdocs.org/tcds/LTC%20AL-13))

## 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 572-611 This certificate issued to: Sierra Industries, Inc., a Texas Corporation Garner Field Road Uvalde, TX 78801 Part 9 of the CiviI Ai x Foegulations.

Original Product Type Certificate Number: LTC-13 Make: Lockheed Aircraft Corp.

Model: PV-1 Description of Type Design Change:

Modification of wing flap cylinder to incorporate "o" ring seals in accordance with Howard Aero, Inc. Drawing 1639, Change A dated 9/16/58.

Date of Application: July 30, 1958 Date Reissued: December 1, 1999 Date of Issuance: September 18, 1958 Date Amended: May 8, 1967 Revision 3 FEDERAL AVIATION By Direction of the Administrator Michelz MOwster (Signature) Michele M. Owsley, Manager TOMINISTRATO Airplane Certification Office, Southwest Region (Title)

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP code ) from (Name of grantor) (Print or type) - (Address of grantor) (Number and street) (City, State, and ZIP code) Extent of Authority (if licensing agreement): - Date of Transfer: - Signature of grantor (In ink):

**FAA AC 69-5536**

## Every issue (1)

- December 1, 1999: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/b3/98/b3985fe98e66dedfade201cb0bc2a215a9199bcc4c3d9e2e30db9590df23bb73)

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