# STC ST09863AC

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Sierra Industries Ltd., United States
- Description: Removal of original equipment manufacturer ladder and installation of a new design cabin entrance step assembly
- Applied: October 20, 2015
- Status date: July 14, 2017
- Product: Aircraft, Large Airplane
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A22CE](https://openairdocs.org/tcds/A22CE)
- Certificate PDF: https://openairdocs.org/files/sha256/4a/dc/4adc44e524c0dfd518aeacdd3a7d8ac6fbaacdcb731df1cab1232181a15c95a2
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/27E0E27AE4E8CB1886258726004BD1C5.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST09863AC

## ADs that name it (0)

None.

## Approved models (4)

- Textron Aviation Inc. 500 ([TCDS A22CE](https://openairdocs.org/tcds/A22CE))
- Textron Aviation Inc. 550 ([TCDS A22CE](https://openairdocs.org/tcds/A22CE))
- Textron Aviation Inc. 560 ([TCDS A22CE](https://openairdocs.org/tcds/A22CE))
- Textron Aviation Inc. S550 ([TCDS A22CE](https://openairdocs.org/tcds/A22CE))

## 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 14, 2017 to supersede the original STC, which has been lost or misplaced.

Number: ST09863AC

Part 25 of the Federal Aviation Regulations.

Original Product – Type Certificate Number: A22CE Make: Textron Aviation, Inc. (Cessna) Model: 500, 550, S550 & 560 Description of Type Design Change:

Removal of original equipment manufacturer ladder and installation of a new design cabin entrance step assembly in accordance with Master Drawing List number SI610-000, Rev C, dated June 30 2016, or later FAA approved revision.

The installer must determine whether this design change is compatible with previously approved modifications. If the holder agrees to permit another person to use this certificate to alter A product, the holder must give the other person written evidence of that permission.

Date of Application: October 20, 2015 Date Reissued: September 27, 2016; July 14, 2017 Date of Issuance: September 1, 2016 Date Amended:

Signature

Title James A. Grigg Manager, Fort Worth Aircraft Certification Office , Southwest Region 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: ST09863AC

To (Name and address of transferee)

From (Name and address of grantor)

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

## Every issue (3)

- July 14, 2017: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/4a/dc/4adc44e524c0dfd518aeacdd3a7d8ac6fbaacdcb731df1cab1232181a15c95a2)
- September 27, 2016: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/f4/a8/f4a86c652a0c085632cd5c5020b1cd88557dd3b8272487c350deef4a7ae64d9e)
- September 1, 2016: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/e6/1b/e61b5394eda7f68eea215f2e03f472fcfdcd547c0f584879ca5c6bbec7ba0949)

---
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.