# STC ST28CH-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Garrett Aviation Services, United States
- Description: Installation of a Honeywell TCZ-910 TCAS II System
- Applied: December 18, 1992
- Status date: January 27, 1993
- Product: Aircraft, Large Airplane
- Data sheets: [TCDS A3EU](https://openairdocs.org/tcds/A3EU)
- Certificate PDF: https://openairdocs.org/files/sha256/45/76/4576c78373d447b2095ba945b5ff4ebeeb23b03b693a0a563624b0287df47570
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID118785458620250612202721.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST28CH-D

## ADs that name it (0)

None.

## Approved models (3)

- Textron Aviation Inc. BAe.125 Series 800A ([TCDS A3EU](https://openairdocs.org/tcds/A3EU))
- Textron Aviation Inc. BAe.125 Series 800A (C-29A) ([TCDS A3EU](https://openairdocs.org/tcds/A3EU))
- Textron Aviation Inc. BAe.125 Series 800A (U-125) ([TCDS A3EU](https://openairdocs.org/tcds/A3EU))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number ST28CH-D This certificate issued to: Garrett Aviation Services 2 North Airport Drive Capital Airport Springfield, IL 62707 Purt 10 of the Civil Air Regulalions: See Iype Certificate Data Sheet A3EU for complete certification basis.

Original Product -Typebertificate Number: ABEU Make: Raytheon Corporate Jets, Inc.

Model: HS125-800A Description of Type Design Change: .

nstallation of a Honeywell TCZ-910 TCAS II System comprised of the following mode.

Number: RT-910 TCAS Processor; two Collins TDR-94D Mode-S Transponders; one CTL- 92T Collins TCAS Control; one Collins CTL-92 Dual Mode-S Control; one Honeywell AT-910 TCAS Antenna; one Dorne Margolin DMN150-6-2 Omni Directional Antenna and two Dorne Margolin DMN150-6-2 Mode-S Antennas, installed per Garrett drawing no.

4413438, dated 1/13/93, no revision, or later FAA approved revision.

This approval should not be extended to other aircraft of these models on which previously approved modifications are incorporated unless it is determined by the installer that the interrelationship between this change and any of these previously approved modifications will introduce no adverse effect on the airworthiness of the aircraft. FAA approved Flight Manual Supplement, dated January 27, 1993, or later FAA approved revision is a required part of this STC.

Date of Application: December 18, 1992 Sate wissued: June 30, 1994 Sale sf issuance: January 27, 1993 Date Amended:

DERAL AVIATION Gregory M. Byrnes Signature) Facility Manager Garrett Aviation Services VOMINISTRANO FAA DAS 1 GL, Springfield, IL 62707 (Title) 47 FAA FoR 8110-2 (10-68)

## Every issue (2)

- January 27, 1993: Issued, Current. [certificate](https://openairdocs.org/files/sha256/45/76/4576c78373d447b2095ba945b5ff4ebeeb23b03b693a0a563624b0287df47570)
- January 27, 1993: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/b1/6c/b16c99538968af8922df6138639423eae16098b58cbe121c90bca4450f308202)

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