# STC SA2726SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Honeywell International Inc., United States
- Description: Installation of CAS-81 TCAS II system.
- Applied: February 23, 1990
- Status date: January 19, 2022
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 25
- Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE)
- Certificate PDF: https://openairdocs.org/files/sha256/f3/3a/f33a4256ade3bcfeffb995538a803d96f83cd5a375ebb7b7d10789db71be9274
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID180884400920221123181009.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2726SO

## ADs that name it (0)

None.

## Approved models (5)

- McDonnell Douglas Corporation DC-9-81 (MD-81) ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-82 (MD-82) ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-83 (MD-83) ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-87 (MD-87) ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation MD-88 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))

## 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 ___ SA2726SO Honeywell International Inc.

21111 N 19th Ave Phoenix, Arizona 85027 Part 25 the Federal Aviation Regulations A6WE McDonnell Douglas MD-80 Series Installation of a CAS 81 TCAS II system in accordance with Page Avjet Master Drawing List MDL-90-06, Revision A, dated March 19, 1990, Page Avjet Engineering Directive, Drawing No. 342200102-012, Inital Release, dated June 4, 1990, and Bendix/King Drawing No. 699-62503, Inital Release, dated October 14, 1991; or AlliedSignal Master Drawing List No.

699-50005, Revision G, dated October 8, 1999; or later FAA approved revision.

This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated, unless it is determined by the installer that the interrelationship between this change and any other previously approved modifications will produce no adverse effect 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. FAA approved Airplane Flight Manual Supplement No. 699-52554, Revision C, dated October 19, 1999, or later FAA approved revision, is a required part of this STC.

February 23, 1990 February 24, 2000; January 19, 2022 March 21, 1990 June 15, 1990; Dec 24, 1991; February 24, 2000 For Acting Manager, Seattle ACO Branch 2

FAA Form 8110-2 (11/20) SUPERSEDES PREVIOUS EDITION Page 2 of ___ SA2726SO 2

## Every issue (1)

- January 19, 2022: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/f3/3a/f33a4256ade3bcfeffb995538a803d96f83cd5a375ebb7b7d10789db71be9274)

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