# STC SA503EA-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: American Airlines Inc, United States
- Description: 1) Add additional first class passenger seats and class divider. 2) Add two additional coat closets in Zone C
- Applied: April 9, 1970
- Status date: May 11, 1970
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE)
- Certificate PDF: https://openairdocs.org/files/sha256/da/9d/da9d70f9c9b0a7f29408aaf99bb7e1c60438160ffecb33e104148e0a3d258869
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7C72F3A02AF82DA185256CC200122635.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA503EA-D

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 747-100 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.

Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA503EA-D This certificate issued to: American Airlines, Inc.

Maintenance & Engineering Center Tulsa, Oklahoma 74151 Purt 25 of the Federal Aviation Regulations: and special condition per WE120 letter to The Boeing Company dated 20 February 1970 for 747-100 Original Product -Iype bertificate Number: A20WE Make: Boeing Model: 747-121 Description of Type Design Change:

1) Add additional first class passenger seats and class divider in accordance with American Airlines Engineering Change Order Y.00035 Revision B dated 4/13/70 and drawings as listed on Page 3 of that ECO. Configuration is now 8 lounge, 86 F/C, 245 T/C.

2) Add two additional coat closets in Zone C in accordance with ECO Y.00043 dated 5/8/70 and drawings as listed on Page 3 of that ECO.

This approval should not be extended to other specific aircraft of this model on which other approved modifications are incorporated, unless it is determined that interrelationship between this change and any of those other previous incorporated approved modifications will introduce no adverse effect upon the airworthiness of that aircraft.

Date of Application: 4/9/70 Date Reissued:

Date of Issuance: 5/11/70 Date Amended:

EDERAL AVIATION By Direction of the Administrator Re 2. Nomen (Signature) W.P.Hannan 4OMINIS Coordinator DAS IEA (Title)

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and Z1P code) from (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, State, and ZIP code) Exent of Authority (if licensing agreement) :

Signature of grantor (In ink) : .....

Page of 2

## Every issue (1)

- May 11, 1970: Issued, Current. [certificate](https://openairdocs.org/files/sha256/da/9d/da9d70f9c9b0a7f29408aaf99bb7e1c60438160ffecb33e104148e0a3d258869)

---
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.