# STC SH1147NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Helicopter Maintenance Corp., United States
- Description: Installation of a Chadwick Spray System
- Applied: April 3, 1980
- Status date: December 16, 1980
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS 4H11](https://openairdocs.org/tcds/4H11)
- Certificate PDF: https://openairdocs.org/files/sha256/0a/8f/0a8f87c043a7fda4d97df89b15d0e6e526ee99ec8426b461d33646439c721fb4
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/34592F45D8F8AB2486257A3D005989C9.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH1147NW

## ADs that name it (0)

None.

## Approved models (1)

- Siam Hiller Holdings Inc. UH-12E ([TCDS 4H11](https://openairdocs.org/tcds/4H11))

## 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: SH1147Nw This certificate issued to: Helicopter Maintenance Corporation Certifies that the change in the type design for the fatting preduct with the limitations and conditi as therefer as specified herean meets the airerhiness requirments of Purt 6 of the Civil Air Original Product - ype tartificate. Sunder: 4811 . Make Hiller . Ink/ UH-12E (As modified by STC SH178WE) Description of Type I sign thump Installation of a Chadwick C-512S Spray System in accordance with Chadwick, Inc. Top Drawing No. 512-00000.

Jim «/i Data pertaining to this modification are considered inadequate for duplication in other helicopters. This approval is limited to the installation in Hiller UH-12E, Serial Number 1315 only. A copy of this Certificate and FAA Approved Rotorcraft Flight Manual Supplement shall be maintained as part of the permanent records for the modified helicopter.

Date of Application: April 3, 1980 I ate missud:

I ate of issues December 16, 1980 Date Amended:

FEDERAL AVIATION By Direction of the Administrator Karto Cositinda.

( Signature ) TO MINISTRATO Acting Chief, Seattle Area Aircraft Certification Office ( Title ) 47 FAA FORM 8110-2 (10-68)

## Every issue (1)

- December 16, 1980: Issued, Current. [certificate](https://openairdocs.org/files/sha256/0a/8f/0a8f87c043a7fda4d97df89b15d0e6e526ee99ec8426b461d33646439c721fb4)

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