# STC ST604CH-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Duncan Aviation Inc, United States
- Description: Installation oof AlliedSignal Mark VII ground proximity warning system with windshear detection system.
- Applied: May 1, 1997
- Status date: September 16, 2008
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A9NM](https://openairdocs.org/tcds/A9NM)
- Certificate PDF: https://openairdocs.org/files/sha256/23/83/23835c71b8a7a578fa20dc5608690f6c434467f44fa80ee07d4d3ad1edd66892
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7C84A295BDE19BF18625794F00694626.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST604CH-D

## ADs that name it (0)

None.

## Approved models (1)

- Cessna Aircraft Company 650 ([TCDS A9NM](https://openairdocs.org/tcds/A9NM))

## 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.

Part 25 of the Federal Aviation Regulations. See Type Certificate Data Sheet A9NM for complete Certification Basis.

Description of Type Design Change: Installation of AlliedSignal Mark VII Ground Proximity Warning System with Windshear Detection System in accordance with Kal-Aero, Inc., Master Drawing List, No.

KA9705-01R, Revision A, dated July 15, 1997, FAA approved August 8, 1997 or later approved revision.

1. FAA approved Airplane Flight Manual Supplement, KA9705-05R, Revision Ø, dated May 1, 1997, FAA approved August 8, 1997, or later FAA approved revision is required.

2. Compatibility of this design change with previously appr oved modifications must be determined by the installer.

3. 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.

4. A copy of this Certificate and Flight Manual Supplement must be maintained as part of the permanent records of the modified aircraft.

Duncan Aviation Inc.

3701 Aviation Rd.

Lincoln, NE 68524 A9NM Make : Cessna Model : 650 Date of application : May 1, 1997

Date of issuance : August 8, 1997 Date reissued : September 16, 2008

Original signed by Steve Simpson

( Signature) Steven K. Simpson DAS Administrator, DAS-501013-CE Duncan Aviation, Lincoln, Nebraska

( Title)

FAA FORM 8110-2-1(10-69) PAGE 2 of 2 PAGES

Transfer the ownership of Supplemental Type Certificate Number

to (Name of transferee)

(Address of transferee) (Number and street)

(City, State, and ZIP code)

from (Name of grantor) (Print or type)

(Address of grantor) (Number and street}

(City, State, and ZIP code)

Signature of grantor (In ink)

## Every issue (1)

- September 16, 2008: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/23/83/23835c71b8a7a578fa20dc5608690f6c434467f44fa80ee07d4d3ad1edd66892)

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