# STC ST00231BO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Yokohama Aerospace America Inc., United States
- Description: Limited to installation of Yokohama forward lavatories on Boeing 737-800 serial number 28325,30470,32277, and 32278 only.
- Applied: July 25, 2005
- Status date: April 21, 2006
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A16WE](https://openairdocs.org/tcds/A16WE)
- Certificate PDF: https://openairdocs.org/files/sha256/82/63/8263ec1ecc16bbd7bde3e194e66eb08ebdcdf7c5b8dc122e597995e27fba03c1
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BC73C470AD34CBC58625743A0069BF75.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/ST00231BO

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 737-800 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE))

## 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.

United States of America Department of Transportation - Federal Aviation Administration Supplemental Type Certificate Number ST00231BO This certificate, issued to: Yokohama Aerospace America, Inc.

18401 72 nd Avenue South Kent, WA 98032 Part 25 of the Federal Aviation Regulations.

Original Product⎯Type Certificate Number: A16WE Make: Boeing Model: 737-800

Description of the Type Design Change: Installation of Yokohama forward Lavatory E and Yokohama aft Lavatory K and attendant seat in accordance with TTF Aerospace Master Drawing List TTF-05T026-01, Rev B dated February 24, 2006.

1. Limited to installation on Boeing 737- 800 serial number 28325, 30470, 32277 and 32278 only.

2. Installation of ST01533LA required

3. Instructions for continued airw orthiness (ICA), TTF Aerospace Document TTF-05T026-18, Revision New, dated February 13, 2006, or later FAA accepted revision shall be made available to the operator at the time of installation.

4. Compatibility of this design change with other pr eviously approved modifications must be determined by the installer.

The STC holder will provide each person it permits to use this certificate to alter the product written evidence of the agreement in a form acceptable to the Administrator.

Date of application: July 25, 2005 Date reissued: April 21, 2008 Date of issuance: March 15, 2006 Date amended:

By direction of the Administrator Original Signed by Victor W. Wicklund

(Signature)

Acting Manager, Seattle Aircraft Certification Office (Title)

## Every issue (2)

- April 21, 2006: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/82/63/8263ec1ecc16bbd7bde3e194e66eb08ebdcdf7c5b8dc122e597995e27fba03c1)
- March 15, 2006: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/54/0b/540b2d9e280c7649617695272194fd720d591c23c744088381cbcedfbfa8fa6c)

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