# STC SA4-327

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Northwest Airlines, Inc, United States
- Description: Installation of hydraulic main cabin door lift adapted for use on both Temco and Metropolitan air stair doors.
- Applied: September 4, 1957
- Status date: November 14, 1986
- Product: Aircraft, Large Multi-Engine
- Data sheets: [TCDS A-669](https://openairdocs.org/tcds/A-669)
- Certificate PDF: https://openairdocs.org/files/sha256/8d/ac/8dacf0d765ce09c17602dd13a56d02af7e9cf37aa319ed7760265462c683b722
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID135103612620260715183408.0001
- DRS record last changed: July 15, 2026
- Page: https://openairdocs.org/stc/SA4-327

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-3C Series ([TCDS A-669](https://openairdocs.org/tcds/A-669))

## 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: SA4-327 This certificate issued to: Northwest Airlines, Inc.

2700 Lone Oak Parkway Eagan, MN 55124 Puri 4A of the CiVil Air Regulations.

Original Product -Type Certificale Nurnber: A669 Make: Douglas Mirtel: DC3C Description of Type Design Change:

Installation of Hydraulic Main Cabin Door Lift adapted for use on both Temco and Metropolitan Air Stair Doors per West Cost Airlines Drawings No. 201 and Limitations and Conditions:

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

Date of Application: September 4, 1957 Date Reissued: October 13, 1982 Date of Issuance: October 16, 1957 Date Amended: November 14, 1986 FEDERAL AVIATION Ber dirt ten it then then ministrater TAIN STRATION w. F. Horn Manager, Chicago Aircraft Certification Office, (Signature) ACE-115C, Central Region, FAA (Title)

## Every issue (1)

- November 14, 1986: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/8d/ac/8dacf0d765ce09c17602dd13a56d02af7e9cf37aa319ed7760265462c683b722)

---
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.