# STC SA2-523

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Staggerwing Museum Foundation Inc., United States
- Description: Revise horizontal stabilizer angle of incidence from -3.6 degrees to-0.5 degrees.
- Applied: April 15, 1958
- Status date: October 6, 2006
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-2-582](https://openairdocs.org/tcds/A-2-582), [TCDS A-757](https://openairdocs.org/tcds/A-757)
- Certificate PDF: https://openairdocs.org/files/sha256/b4/06/b406fdb2797046b3eba8a85930ee605f1c9584400f1d6fe0a446207912491350
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C1E1624F2A8EE4AA862574F100667E15.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2-523

## ADs that name it (1)

- [AD 65-03-01](https://openairdocs.org/ad/65-03-01): Gap Seal Strips · Recertification under subparts B &G of CAR 3 and installation… (Staggerwing Museum Foundation STC SA2-1016 or 7 others). Named in the applicability

## Approved models (2)

- Hawker Beechcraft Corporation Army AT-11 ([TCDS A-2-582](https://openairdocs.org/tcds/A-2-582))
- Hawker Beechcraft Corporation C18S ([TCDS A-757](https://openairdocs.org/tcds/A-757))

## 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.

This certificate issued to: Staggerwing Museum Foundation, Inc.

560 Old Shelbyville Hwy Tullahoma, TN 37388

Part 4a of the Civil Air Regulation.

Original Product - Type Certificate Number : 757 and 2-582 Make : Beech Model : C18S and AT-11

Revised horizontal stabilizer angle of incidence from -3.6° to -0.5° in accordance with Airline Training, Inc.

Drawing No. 2103E; or 2103G or 2103H and 2104; or 2103F.

Installation of Elevator Seal Assembly in accordance with Drawing No. 2102B.

These modifications are eligible with or without STC SA4-128.

Airworthiness compatibility of this STC with all other major changes to the standard original model(s) shown above should be confirmed prior to installation of this STC. 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 reissued : December 9, 1966; August 15, 1968;

February 26, 1990; October 6, 2006 Date amended : November 16, 1961

Original signed by Robert D. Adamson

( Signature) Robert D. Adamson Program Manager Wichita Aircraft Certification Office (Title) Date of application : April 15, 1958 Date of issuance : December 10, 1958

## Every issue (1)

- October 6, 2006: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/b4/06/b406fdb2797046b3eba8a85930ee605f1c9584400f1d6fe0a446207912491350)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.