# STC SA402EA-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: American Airlines Inc, United States
- Description: Removal of pressure operated check valve from each of two paired sets of spoiler actuators and installation of a single pressure operated check valve in the hydraulic lines between the spoiler actuators and spoiler control valve
- Applied: September 22, 1966
- Status date: November 16, 1966
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 4A26](https://openairdocs.org/tcds/4A26)
- Certificate PDF: https://openairdocs.org/files/sha256/96/79/9679ae6b9a2184d4de27ba1debdd14d5855e734f94ae474f710db2819dba246a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8C73EE84C7F6134286257DF9007A1000.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA402EA-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.

Federal Zviation Agency Supplemental Type Certificate Number 5A4025A=3 This certificate issued to: le American Airlines, Inc.

633 Third Avenue New York, New York Certifies that the change in the type design for the fitting freduct with the tirnitutions and conditions CAR 4B therefer as specified hereen mats the aimerhiness requirements if Part 25| of the tulared Shriation Bequeations.

Original Product Type bartificater Number: 4A26 Make Boeing Model: 707-3230 Removal of pressure operated check valve from each of two paired sets of spoiler actuators and installation of a single pressure operated check valve in the hydraulic lines between the spoiler actuators and spoiler control valve per American Airlines Engineering Change Order B.02619D dated November 16, 1956.

This approval should not be incorporated in any aircrait 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.

Johnson (Signuter) TED STATES OF Coordinator DASIEA Titles acate is pushabile fine of not exceeding $1,000, or imprisonment not exceeding 3 rears. or both.

This certificate may be transferred in rune with PAR 21.A7.

**FAA FORM 8110-2 (1-58) 0052-657-6000**

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) :

## Every issue (1)

- November 16, 1966: Amended, Current. [certificate](https://openairdocs.org/files/sha256/96/79/9679ae6b9a2184d4de27ba1debdd14d5855e734f94ae474f710db2819dba246a)

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