# STC SH717NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Simplex Manufacturing Co, United States
- Description: Installation of Simplex Model 4500 spray system.
- Applied: January 9, 1979
- Status date: February 20, 1979
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS 4H11](https://openairdocs.org/tcds/4H11)
- Certificate PDF: https://openairdocs.org/files/sha256/8b/5d/8b5d99d05099b34b65c14ca6d6822d0db21c8c26c7131128ac5785fedc4fd87f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B6D4142FF935025C85256CC2006221DD.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH717NW

## 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

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.

Un i te d St ate s of Am e ri ca Department of Transportation-------Federal Aviation Administration Supplemental Type Certificate

Number SH717NW

This certificate, issued to Simplex Manufacturing Company

Part 6 of the Civil Air Regulations.

Original ProductType Certificate Number: 4H11 Make: Hiller Model: UH-12E Series

Description of the Type Design Change: Installation of a Model 4500 spray system in accordance with Simplex Manufacturing Company Installation Instructions, Model 4500 Spray System.

Limitations and Conditions: Approval of this change in type design applies basically to the above model helicopter only. This approval should not be extended to other helicopters of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the air­ worthiness of that helicopter.

Date of application: January 9, 1979 Date reissued:

Date of issuance: February 20, 1979 Date amended:

(Signature)

Chief, Engineering and Manufacturing Branch (Title)

Un i te d St ate s of Am e ri ca Department of Transportation-------Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet)

February 10, 1979 Number SH717NW

A copy of this Certificate, FAA Approved Flight Manual Supplement and Simplex Manufacturing Company Installation Instructions, Model 4500 Spray System shall be maintained as part of the permanent records for the modified helicopter.

**FAA FORM 8110-2-1 (10-69)**

## Every issue (1)

- February 20, 1979: Issued, Current. [certificate](https://openairdocs.org/files/sha256/8b/5d/8b5d99d05099b34b65c14ca6d6822d0db21c8c26c7131128ac5785fedc4fd87f)

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