# STC SA857NW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Honeywell International Inc, United States
- Description: Installation of Sundstrand performance advisory display(SPAD) system.
- Applied: August 13, 1979
- Status date: January 4, 2022
- Product: Aircraft, Large Airplane
- Certification basis: Part 21, Part 21, Part 21, Part 21, Part 21, Part 21, Part 21
- Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE), [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- Certificate PDF: https://openairdocs.org/files/sha256/d6/f4/d6f4d6059b868b43f34ec714a08e90522c4403b9322d346563a08919a67d10c6
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID112474960520221206160016.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA857NW

## ADs that name it (0)

None.

## Approved models (3)

- The Boeing Company 727-100 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))
- The Boeing Company 727-200 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))
- The Boeing Company 747-100 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))

## 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 (11/20) SUPERSEDES PREVIOUS EDITION Page 1 of ___ United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number:

SA857NW Honeywell International Inc.

21111 N 19th Ave Phoenix, Arizona 85027 * * * * * See attached Master Eligibility List Number SA857NW for list of approved airplane models and regulations.

Installation of Sundstrand Performance Advisory Display (SPAD) System in accordance with the applicable data listed on the attached FAA Sealed Master Eligibility List Number SA857NW.

The approval of this change in type design applies basically to the aircraft models listed on FAA Approved Master Eligibility List Number SA857NW and should not be extended to other specific models of these airplanes 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. The installer must determine whether this design change is compatible with previously approved modifications.

If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

August 13, 1979 January 4, 2022 November 14, 1979 For Acting Manager, Seattle ACO Branch 2

FAA Form 8110-2 (11/20) SUPERSEDES PREVIOUS EDITION Page 2 of ___ United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number:

SA857NW 2

## Every issue (2)

- January 4, 2022: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/d6/f4/d6f4d6059b868b43f34ec714a08e90522c4403b9322d346563a08919a67d10c6)
- January 4, 2022: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/bd/c6/bdc64a5b975c4d98ae388ce40fd1460adb10a91f3abeea6f50888e2b0d4b8699), [MEL_SA857NW.pdf](https://openairdocs.org/files/sha256/5a/66/5a66b8738720bb12c383e81dcf5374130a9141e27fb33a1d6b209c8d65257826)

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