# STC SA525EA-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: American Airlines Inc, United States
- Description: Convert interior passenger arrangement to the summer configuration of four first class lounge, 26 first class, and 113 tourist class seats by
removing the LH coat compartment, three first class double seats, and
installing two additional rows of tourist class seats and a LH class divider
- Applied: January 3, 1969
- Status date: April 15, 1970
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 4A26](https://openairdocs.org/tcds/4A26)
- Certificate PDF: https://openairdocs.org/files/sha256/1c/11/1c118da3c444000b853b1216fe6f32bade96414999eed3b07a943e33e605c138
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E5075C917E7A818885256CC2001227E8.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA525EA-D

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 707-300C Series ([TCDS 4A26](https://openairdocs.org/tcds/4A26))

## What the certificate says

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

Lantco Stereo of Amera Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SA52 5EA-D This certificate issued to: American Airlines, Inc.

Maintenance & Engineering Center Tulsa, Oklahoma 74151 Certifies that the change in the type design fox the following froduct with the limitations and conditions therefir as specified here meeta the aimurthiness requirementiof Part 25 ofthe Federal Aviation Regulations.

Original Product - Type Certificate Number: 4A26 / Make: Boeing Model: 707-323C Description of Type Design Change:

Convert the interior passenger arrangement to the summer configuration of four first class lounge, 26 first class, and 113 tourist class seats by removing the In coat compartment, three first class double seats, and installing two additional rows of tourist class seats and a Il class divider per American Airlines Engineering Change Order B.03622 dated 4/3/70 and drawings as listed on Page 3 of that Engineering Change Order.

This approval should not be incorporated in any aircraft of this specific model on which other approved modifications are incorporated, unless it is determined that the interrelationship between this change and any of those previously incorporated approved modifications will not introduce any adverse effect upon the airworthiness of the aircraft.

Date of Application: 1/3/69 Date Reissued:

Date of Issuance: 1/13/69 Date Amended: 11/7/69, 4/15/70 FEDERAL ANTATION Try direction of the Sidininistrator M1 C. Aimen W. P. Hannan (Signature) Coordinator DAS 1EA (Title)

47.

INSTRUCTIONS : The transfer endorsement below may be used to notify the appropriate FAA Regional Office of the transfer of this Supplemental Type Certificate.

The FAA will reissue the certificate in the name of the transferre and forward it to him.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP 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) :

## Every issue (1)

- April 15, 1970: Amended, Current. [certificate](https://openairdocs.org/files/sha256/1c/11/1c118da3c444000b853b1216fe6f32bade96414999eed3b07a943e33e605c138)

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