# STC SA00421BO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: ATI Engineering Services LLC, United States
- Description: Installation of Interior Sidewall Blanket
- Applied: October 28, 2022
- Status date: August 5, 2024
- Product: Aircraft, Small Airplane
- Certification basis: Part 23
- Data sheets: [TCDS A37CE](https://openairdocs.org/tcds/A37CE)
- Certificate PDF: https://openairdocs.org/files/sha256/23/00/23001f79aee4b806067cc39395200d8ffc313d79dced4124a3aedb38900bb5f1
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID148131961020250616140348.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA00421BO

## ADs that name it (0)

None.

## Approved models (1)

- Textron Aviation Inc. 208B ([TCDS A37CE](https://openairdocs.org/tcds/A37CE))

## 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.

the Title 14 Code of Regulations.

SA00421BO ATI Engineering Services, LLC 469 Airport Road, Hangar 9 Johnstown, Pennsylvania 15904 Part 23

A37CE Textron Aviation, Inc.

208B

1. This STC is applicable to all serial numbers for this Textron Aviation Model 208B aircraft.

(Limitations and Conditions continued on Page 3 of 3) 10/28/2022 08/05/2024 06/03/2024 Christina M. Underwood Manager, East Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 3

1. Installation of Interior Sidewall Blanket in accordance with ATI Engineering Services Installation/Manufacturing Document List, Document no. IDL-210931, Revision 2, dated August 9, 2023, or later FAA approved revision.

2. Instructions for Continued Airworthiness (ICA), Document no. ICA-210931, Revision 2, dated October 2, 2023, or later FAA accepted revision.

SA00421BO 08/05/2024 3

SA00421BO 08/05/2024 Limitations and Conditions continued:

2. The installer must determine whether this design change is compatible with previously approved modifications.

3. 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.

------------------------------------------------------END-------------------------------------------------- 3 3 Add Page

## Every issue (2)

- August 5, 2024: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/23/00/23001f79aee4b806067cc39395200d8ffc313d79dced4124a3aedb38900bb5f1)
- June 3, 2024: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/8c/13/8c139d672667762d8c682777add5a52b440bb5f6689551e2245579024e090a93)

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