# STC SA2581WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Collins Radio Company, United States
- Description: Installation of Collins Radio Company inertial navigation systems.
- Applied: July 14, 1972
- Status date: November 18, 1999
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A25](https://openairdocs.org/tcds/4A25)
- Certificate PDF: https://openairdocs.org/files/sha256/82/75/827557a1484f436f2257a42927ac2ba297bb5ac1975e51dc52b7991ab192b518
- Approved model list and other attachments: [SA2581WE_AML.pdf](https://openairdocs.org/files/sha256/86/50/8650d70a7753f9cd6d3d10403b7043b605218adca39974895fb9942edd7d3846)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4EB43103DAB8354E85256CC20001600E.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA2581WE

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-8-62 ([TCDS 4A25](https://openairdocs.org/tcds/4A25))

## 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 Reissued to replace certificate reported lost.

Number: SA2581WE This certificate issued to: Collins Radio Company 400 Collins Road, NE Cedar Rapids, Iowa 52498 Part 4b of the Civil Abir PRegulations. dated 31 December 1953 (See T. C. Data Sheet 4A25).

Original Product Typo Certificato Number: 4A25 Make: McDonnell Douglas Corp.

Model: See attached Master Eligibility List Number SA2581 WE Description of Type Design Change: Installation of Collins Radio Company internal navigation systems in accordance with the applicable FAA sealed drawings listed on the attached Master Eligibility List Number SA2581 WE.

Limitations and Conditions: The approval of this change in type design applies basically to the aircraft models listed on the FAA Approved Master Eligibility List Number SA2581 WE and should not be extended to other specific airplanes on which other previously approved modification are incorporated, unless it is determined that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse affect upon the airworthiness of that airplane. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

Date of Application: July 14, 1972 Date Reissued: Mar. 31, 1998, Nov. 18, 1999 Date of Issuance: August 23, 1972 Date Amended:

FEDERAL AVIATION By Direction of the Administrator Michael & Maply TOMINISTRATO Staff, Los Angeles Aircraft Certification Office (Title)

### SA2581WE_AML.pdf

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

FAA APPROVED MASTER ELIGIGILITY LIST NUMBER SA2581WE STC No. SA2581 WE For Installation of INS-61B Inertial Navigation Systems Page 1 of 1 Page 3 of STC SA2581 WE Item Aircraft Aircraft Original Certification FAA Sealed AFM MEL Make Model Type Basis for Drawings/ Supplement Amendment Certificate Alteration Dwg.List Number/ Date Number Number Rev. Date 1 Douglas DC-8-62 4A25 CAR 4b Appendix DAC-33162 August 23, "A" Lost 1 Collins 1972 and Appendix Supplement "D" both Revision dated 7/21/72 August 23 1972 2 Douglas DC-8-62 4A25 CAR 4b Appendix DAC-33162 August 23, "A" Lists Collins 1972 1 & 2, and Supplement Appendix "D" Revision all dated Sugust 23, 7/21/72 1972

## Every issue (1)

- November 18, 1999: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/82/75/827557a1484f436f2257a42927ac2ba297bb5ac1975e51dc52b7991ab192b518), [SA2581WE_AML.pdf](https://openairdocs.org/files/sha256/86/50/8650d70a7753f9cd6d3d10403b7043b605218adca39974895fb9942edd7d3846)

---
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.