# STC SA989NW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: AAR Oklahoma Inc, United States
- Description: Installation of a cabin heater exhaust system
- Applied: May 21, 1980
- Status date: July 22, 1988
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A25CE](https://openairdocs.org/tcds/A25CE)
- Certificate PDF: https://openairdocs.org/files/sha256/40/c3/40c3e763aa8d2455f092e21d268292f15ff86419568639409492e7d97fbf24b8
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/90FB557EE5A8FF6D86257A08004B42D0.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA989NW

## ADs that name it (0)

None.

## Approved models (1)

- Cessna Aircraft Company 404 ([TCDS A25CE](https://openairdocs.org/tcds/A25CE))

## 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 SA989NW This certificate issued to: AAR Oklahoma, Inc.

Certifies that the change in the type design for the following freduct with the limitations and condilions therefor as specified heren meets the airshinessequirements of Purt 23 of the Federal Aviation Regulations:

Original Product - Type Certificate Number: A25 CE Make: Cessna Model: 404 Description of Type Design Change: Installation of a cabin heater exhaust system in ccordance with AAl Western Skyways, Inc. cabin heater exhaust sketch No. Cessna 404-0621.

Limitations and Conditions: Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Cessna model 404 aircraft, Serial Number 404-0627 only. A copy of this Certificate shall be maintained as part of the permanent records for the modified aircraft.

Date of Application: May 21, 1980 Date Reissued: July 22, 1988 Date of Issuance: JUly 15, 1980 Date Amended:

FEDERAL AVIATION By Direction of the Administrator Dama GImie

TRAINIST RAID (Title)

**FAA FOR 8110-2 (10-68) -**

## Every issue (1)

- July 22, 1988: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/40/c3/40c3e763aa8d2455f092e21d268292f15ff86419568639409492e7d97fbf24b8)

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