# STC SA2785WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Northrop Grumman Systems Corporation, United States
- Description: Installation of dual Litton LTN-51 or LTN-72 Inertial Navigation System
- Applied: November 13, 1973
- Status date: April 12, 2016
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 4A25](https://openairdocs.org/tcds/4A25)
- Certificate PDF: https://openairdocs.org/files/sha256/58/c2/58c2861aa73cab08100b7d4d2b3c93dd671bacbfcd02f10a947d303b2d8c0814
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5D798D0EAA18619386257FA2006A0946.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2785WE

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company DC-8-62F ([TCDS 4A25](https://openairdocs.org/tcds/4A25))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

FAA Form 8110-2(10-68) Page 1 of 2 Number SA2785WE This Certificate issued to Northrop Grumman Systems Corporation 21240 Burbank Blvd.

Woodland Hills, CA 91367-6675

Part 4b of the Civil Air Regulations.

(See Type Certificate Data Sheet No. 4A25) Original Product Type Certificate Number :

4A25

McDonnell Douglas Corporation

DC-8-62F Description of Type Design Change : Installation of dual Litton LTN-51 or LTN -72 Inertial Navigation System in accordance with Litton Top Installation Drawing, DC-8-62F Installation, No. 678278-12 and in accordance with Litton Systems Supplementary R evisions to the FAA Approved Airplane Flight Manual No. DAC-33162, dated November 20, 1973.

Limitations and Conditions: The approval of this change in type design applies basically to Model DC- 8-62F airplanes only. This approval should not be extended to other aircraft of these models on which other previously approved modifications are incorporated unless it is determined by the installer that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this certificate must be maintained as part of the permanent records for the modified aircraft. 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: November 13, 1973

Date of issuance: November 20, 1973

Date reissued: April 12, 2016

(Signature) Supervisor, Technical & Administrative Support Staff Los Angeles Aircraft Certification Office (Title)

NOTE:

**DO NOT DELETE THIS PAGE.**

**DO NOT ADD ANY DATA TO THIS PAGE.**

**THIS PAGE IS FOR PAGE NUMBERING PURPOSES, PLEASE DISCARD PRINTED COPY.**

## Every issue (1)

- April 12, 2016: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/58/c2/58c2861aa73cab08100b7d4d2b3c93dd671bacbfcd02f10a947d303b2d8c0814)

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