# STC SA551EA-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: American Airlines Inc, United States
- Description: Installation of autopilot go-around unit
- Applied: February 11, 1969
- Status date: August 11, 1969
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 4A21](https://openairdocs.org/tcds/4A21), [TCDS 4A28](https://openairdocs.org/tcds/4A28)
- Certificate PDF: https://openairdocs.org/files/sha256/64/a9/64a9a75bfbe008564ff55ec9174404b1a55b55f31c74e02599fcba8d39149e96
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0D1073FD60B947F485256CC2001229AB.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA551EA-D

## ADs that name it (0)

None.

## Approved models (3)

- The Boeing Company 707-100B Long Body ([TCDS 4A21](https://openairdocs.org/tcds/4A21))
- The Boeing Company 707-100B Short Body ([TCDS 4A21](https://openairdocs.org/tcds/4A21))
- The Boeing Company 720B Series ([TCDS 4A28](https://openairdocs.org/tcds/4A28))

## What the certificate says

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

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA551EA-D This certificate issued to: American Airlines, Inc.

Maintenance & Engineering Center Tulsa, Oklahoma Part 25| (CAR 4b) of the Regulations.

Original Product -Typebertificato Number: 4A21 and 4A28 Make: Boeing Model: 707-123B and 7203-023 Description of Type Design Change: Installation of an autopilot GO-Around unit on Boeing 707-123B and 720B-023 airplanes in accordance with American Airlines ECO B.031?5F dated 7/10/69 and the FAA approved airplane Flight Manual supplementary revisions AAI-12 and AAI-10 to document: D6-1578.0 and D6-1585, dated 8/11/69.

Limitations and Conditions: This approval should not be extended to other specific airplanes of these models on which other previously approved modifications are incorporated unless it is determined that the interrelationship between the change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that airplane.

Date of Application: 2/11/69 Date Reissued:

Date of Issuance: March 1, 1969 Date Amended: August 11, 1969 EDERA VIAT coN By Direction of the Administrator Keene DASIEA Coordinator (Title)

47.

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 (1n ink) :

## Every issue (1)

- August 11, 1969: Amended, Current. [certificate](https://openairdocs.org/files/sha256/64/a9/64a9a75bfbe008564ff55ec9174404b1a55b55f31c74e02599fcba8d39149e96)

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