# STC SA3949SW-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: American Airlines Inc, United States
- Description: Installation of Penny & Giles airspeed and altitude transducers for the digital flight data recorder
- Applied: April 11, 1988
- Status date: June 26, 1988
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- Certificate PDF: https://openairdocs.org/files/sha256/43/fe/43fe2ea9834f0f0bfb777d4a8e7bac32e333cf4b957313f07fa41733c3759999
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A1EB00BBCF223E3285256CC2000C5BED.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3949SW-D

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 727 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))

## 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 SA3949SW-D This certificate issued to: American Airlines, Inc.

P.O. Box 582809 Engineering Department, MD 208 Tulsa, Oklahoma 74158-2809 Part Ab of the CIVII AiX Regulations.

Original Product - Type bertificate Number:

Маке: Boeing Model: Boeing 727-23 Description of Type Design Change:

Installation of Penny & Giles Airspeed and Altitude Transducers for the digital flight data recorder, per ECO H4055AX, dated 6/23/88.

This approval should not be incorporated in any aircraft of this specific model until compatibility of this modification with other previously approved modifications has been determined by the installer.

Date of Application: Apri1 11, 1988 Date Reissued:

Date of Issuance: . JUNE 26, 1988 Date Amended:

FEDERAL INTATION By Direction of the Administrator A.P. Volle (Signature ) * MINISTRATO A. P. Voeller DAS-1SW Coordinator (Title)

**FAA FORK 8110-2 (10-68)**

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 ) Extent of Authority (if licensing agreement):

Date of Transfer: _ Signature of grantor (In ink): _

## Every issue (1)

- June 26, 1988: Issued, Current. [certificate](https://openairdocs.org/files/sha256/43/fe/43fe2ea9834f0f0bfb777d4a8e7bac32e333cf4b957313f07fa41733c3759999)

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