# STC SA1158WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Northwest Airlines, Inc., United States
- Description: Installation of AVQ-75 distance measuring equipment.
- Applied: October 13, 1965
- Status date: November 14, 1986
- Product: Aircraft, Large Airplane
- Data sheets: [TCDS A-669](https://openairdocs.org/tcds/A-669)
- Certificate PDF: https://openairdocs.org/files/sha256/3c/37/3c37d314b75799340d8e942d4175b3212ab8d0391b8dd816e61ce1c74b3432a7
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID157355976720260803160708.0001
- DRS record last changed: August 3, 2026
- Page: https://openairdocs.org/stc/SA1158WE

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-3 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: SA1158WE This certificate issued to: Northwest Airlines, Inc.

2700 Lone Oak Parkway Eagan, MN 55124 Part TA of the Aero BUlletin Regulations: and FAR 121.359.

Original Product - TypeCertificate Number: A669 Make: Douglas Model: DC-3 Description of Type Design Change:

Installation of AVQ-75 DME in accordance to West Coast Airlines Maintenance Engineering Order 3-34-40-1 Revision C, dated January 26, 1966 or MEO 3-34-40-4 dated February 24, 1966.

This approval should not be extended to other specific airplanes of this Model 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: October 13, 1965 Puterissued: October 13, 1982, November 14, 1986 Date of Issuance: February 1, 1966 Date Amended: April 4, 1966 FEDERAL AVIATION Bs dirke tem of the Sadministraton

w. F. Horn (Signature ) TO MINISTRATO Manager, Chicago Aircraft Certification Office ACE-115C, Central Region, FAA (Title)

## Every issue (1)

- November 14, 1986: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/3c/37/3c37d314b75799340d8e942d4175b3212ab8d0391b8dd816e61ce1c74b3432a7)

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