# STC ST00125AT

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Honeywell International Inc, United States
- Description: Installation of the CAS-81 TCAS II .
- Applied: October 9, 1992
- 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, Part 25
- Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE)
- Certificate PDF: https://openairdocs.org/files/sha256/7f/95/7f95e3c83fffcebb050566150cc240788bcd49787664d2e2f70d06119a100180
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID162197451520221208142308.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST00125AT

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 747-400 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:

ST00125AT Honeywell International Inc.

21111 N 19th Ave Phoenix, Arizona 85027 Part 25 Federal Aviation Regulations A20WE Boeing 747-400 Installation of a CAS-81 TCAS II in accordance with Master Drawing List No. 699-50021, Revision H, dated October 8, 1999, or later FAA approved revision; and dual TRA-67 Mode S transponders in accordance with Master Drawing List No. 699-50020, Revision G, dated October 8, 1999, or later FAA approved revision.

FAA approved Airplane Flight Manual Supplement No. 699-60009, Revision C, dated October 19, 1999, or later FAA approved revision, is a required part of this STC. 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.

October 9, 1992 July 27, 2000; January 4, 2022 February 18, 1993 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:

ST00125AT 2

## Every issue (3)

- January 4, 2022: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/7f/95/7f95e3c83fffcebb050566150cc240788bcd49787664d2e2f70d06119a100180)
- January 4, 2022: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/25/84/258494a0e7c0810f8242618bd67cad79a5ef6a170e89bcccbdfc84ad83cd39ec)
- July 27, 2000: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/c1/f1/c1f1fbf5a1ba41b1734bf6f36d4f1cb5ad02f3510fb0d78dd9c8c397e3049ee9)

---
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.