# STC SA4025SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Sierra Industries, Inc, United States
- Description: Structural provisions of mid-lavatory service pan.
- Applied: June 6, 1979
- Status date: December 1, 1999
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 4A21](https://openairdocs.org/tcds/4A21)
- Certificate PDF: https://openairdocs.org/files/sha256/fa/e6/fae64873a144caaaf4a2eadc3a6dafc9b7c4aa470d5e135f15b008aa8d2247b0
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EBA06183A88783FD85256CC2000C603F.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4025SW

## ADs that name it (0)

None.

## Approved models (2)

- The Boeing Company 707-100 Long Body ([TCDS 4A21](https://openairdocs.org/tcds/4A21))
- The Boeing Company 707-100B Short Body ([TCDS 4A21](https://openairdocs.org/tcds/4A21))

## 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.

; ©f <Amtrica JBeparlmmi 0f ^ranspflrlaium - JJfeheral ,Abtati0« ^mmtetratton Certificate SA4025SW Sierra Industries, Inc., a Texas Corporation Garner Field Road Uvalde, TX 78801 4b Civil Air 4A21 Boeing 707-100, 707-100B (Short body) Structural provisions for mid-lavatory service pan in accordance with The Dee Howard Company Drawing List No. 43 dated 6/1/79 or later FAA approved revision.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

.- June 06, 1979 July 27, 1979 .- December 1, 1999 (Signature) Michele M. Owsley, Manager Airplane Certification Office, Southwest Region (Title) Any alteration o/ this certificate is punishable by a fine of not exceeding $1,000, or imprisonment not exceeding 3 years, or both.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and £IP code) from (Name of grantor) (Print or type) .

(Address of grantor) (Number and street) (City, Slate, and £1P code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink): _

## Every issue (1)

- December 1, 1999: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/fa/e6/fae64873a144caaaf4a2eadc3a6dafc9b7c4aa470d5e135f15b008aa8d2247b0)

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From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.