# STC SA1782WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Sierra Industries Ltd., United States
- Description: Installation of drooped ailerons, drooped wing leading edge, stall fence and rudder seal.
- Applied: April 22, 1968
- Status date: July 31, 2017
- Product: Aircraft, Small Airplane
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4)
- Certificate PDF: https://openairdocs.org/files/sha256/ba/b2/bab2efe6e2ca077ccbf7560069b68d1d9b548ad96820d52c99b3a63c6e4cb930
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D3B8820DBFCBE1C98625871F004A5B02.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1782WE

## ADs that name it (0)

None.

## Approved models (1)

- Twin Commander Aircraft LLC 680-E ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

FAA Form 8110-2 (5/14) Page 1 of 2

Reissued on July 31, 2017 to supersede the original STC, which has been lost or misplaced.

Number: SA1782WE

Part 3 of the Civil Air Regulations.

Original Product – Type Certificate Number: 2A4 Make: Aero Commander Model: 680E

Installation of dropped ailerons, drooped wing leading edge, stall fence, and rudder seal per drawings on FAA Sealed Robertson Aircraft Drawing List No. 106.

Airspeed indicator marking:

128 mph for maximum flap (40° full) extension.

FAA Approved Robertson Aircraft Airplane Flight Manual Supplement dated 21 September 1968 required.

Compatibility of this design change with previously approved modifications must be determined by the installer. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

Date of Application: April 22, 1968 Date Reissued: 1/5/69; 1/5/70; 11/5/73; 11/8/84; 10/10/86;

9/8/05; 7/31/17 Date of Issuance: September 25, 1968 Date Amended:

Signature

Title Jim Grigg Manager, Fort Worth A CO Branch, Compliance & Airworthiness Division Sierra Industries, Ltd.

122 Howard Langford Drive Uvalde, TX 78801

FAA Form 8110-2 (5/14) Page 2 of 2

Transfer the ownership of Supplemental Type Certificate Number: SA1782WE

To (Name and address of transferee)

From (Name and address of grantor)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA18NW

FAA Form 8110-2 (5/14) Page 3 of 3

## Every issue (2)

- July 31, 2017: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/ba/b2/bab2efe6e2ca077ccbf7560069b68d1d9b548ad96820d52c99b3a63c6e4cb930)
- September 8, 2005: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/c5/bb/c5bb7beda7aec29938b9b3103d295fb70702feb27aa3378f3e628af3b7a3c583)

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