# STC SA5121NM

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Flight Structures Inc, United States
- Description: Interior main deck araangement that includes galleys, relocated PSU's, seats, ACARS, and inoperative galley medical outlets. (747-357)
- Applied: July 26, 1989
- Status date: February 28, 1991
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE)
- Certificate PDF: https://openairdocs.org/files/sha256/b0/df/b0dfde7cd51e9dc1f17961933c2845ba0dc5dd17421d33f52e59efe1334a4e48
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/52948890C09D071385256CC2001226C3.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA5121NM

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 747-300 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

1309 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA5121NM This certificate issued to: Flight Structures, InC.

Part 25 of the Federal Aviation Regulalions: (see Type Certification Data Sheet A2OWE for complete certification basis) Original Product -Type bertificate Number: AZOWE Make: Boeing Model: 747-357 Petain see gras, and in rative galley mental out ets in accordance with Flight Structures Master Drawing List 89FS051-D81, Revision B, dated February 26, 1991, or later FAA-approved revisions.

Approval of this change in type design applies basically to the Similalions and banditions: above model aircraft only. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthi- ness of that aircraft. A copy of this Certificate and Flight Structures Master Drawing List 89FS051-D81, Revision B, dated February 26, 1991, or later FAA-approved revisions, shall be maintained as part of the permanent records for the modified aircraft. (See Continuation Sheet) February 13, 1991 Date Amended: February 28, 1991 FEDERAL AVIATION By Direction of the Administrator (Signalure) TOMINISTR CATION Assistant Manager, Seattle Aircraft Certification Office (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA5121NM Limitations and Conditions: (continued) The medical outlets are approved only as inoperative ballast in accordance with Flight Structures Master Drawing List 89FS051-D81, Revision B, dated February 26, 1991. The previously installed (not part of this STC) emergency floor proximity lighting does not meet the requirements of FAR 25.812(L) or 121.310(c) but has been accepted by the Switzerland Federal Office for Civil Aviation (FOCA) for use in accordance with FAR 129 operation (Ref: FOCA letter dated February 11, 1991, attached). This aircraft may not be returned to FAR 121 operation without resolution of the floor proximity system.

**FAA FORM 8110-2-1 (10-69) PAGE3 OF3 PAGES**

## Every issue (1)

- February 28, 1991: Amended, Current. [certificate](https://openairdocs.org/files/sha256/b0/df/b0dfde7cd51e9dc1f17961933c2845ba0dc5dd17421d33f52e59efe1334a4e48)

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