# STC SA7042NM-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: LMI Aerospace, United States
- Description: Installation of Dual Honeywell Digital Air Data Computers (DADC) P/N HG480B13 or P/N HG480B100
- Applied: January 10, 1997
- Status date: July 5, 2018
- Product: Aircraft, Large Airplane
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- Certificate PDF: https://openairdocs.org/files/sha256/93/26/9326be6e41d5fa85bc032d2d9187940a73c085f6d416b46e6b0cce2bddc9db61
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7732A5B9E54157E2862582CC006E731C.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA7042NM-D

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 727-100 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))

## 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.

Un ited S tates of Am erica Department of Transportation - Federal Aviation Administration Supplemental Type Certificate

Number SA7042NM-D

This certificate, issued to LMI Aerospace 1910 Merrill Creek Parkway Everett, WA 98203

Part 25 of the Federal Aviation Regulations. (See Type Certificate Data Sheet A3WE for complete certification basis) Original ProductType Certificate Number: A3WE Make: Boeing Model: B727-100

Description of the Type Design Change: Installation of Dual Honeywell Digital Air Data Computers (DADC) P/N HG480B13 or P/N HG480B100 in accordance with Master Drawing List 97 -002. Sheet 1 Revision A dated August 1, 1997 or later FAA/DAS approved revisions.

Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only.

This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the relationship between this change and any of those other previously approved modifications, including changes in type design will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate and Tramco, Inc. Master Drawing List 97-002 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: January 10, 1997 Date reissued: July 5, 2018 Date of issuance: March 3, 1997 Date amended: November 25, 1997

(Signature)

Manager, Seattle ACO Branch (Title)

## Every issue (1)

- July 5, 2018: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/93/26/9326be6e41d5fa85bc032d2d9187940a73c085f6d416b46e6b0cce2bddc9db61)

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