# STC SR01571SE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Helicopter Transport Services LLC, United States
- Description: Fabrication and installation of Helicopter Transport Services, Inc. (HTSI) Automatic Flight Control System (AFCS)
- Applied: January 30, 2003
- Status date: January 9, 2014
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21, Part 29
- Data sheets: [TCDS H14NM](https://openairdocs.org/tcds/H14NM)
- Certificate PDF: https://openairdocs.org/files/sha256/3a/67/3a6714887499f57cae7f4fc6d9db5650feadd8bcbe79395bce240b5802145c74
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B2074E527F92C46E86257C5C007309BD.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SR01571SE

## ADs that name it (0)

None.

## Approved models (1)

- Helicopter Transport Services Inc. CH-54B ([TCDS H14NM](https://openairdocs.org/tcds/H14NM))

## 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.

United States of America Department of Transportation - Federal Aviation Administration Supplemental Type Certificate Number SR01571SE

This certificate issued to Helicopter Transport Services, LLC 14497 Keil Road NE Aurora, OR 97002

Part 29 of the Federal Aviation Regulations.

Original ProductType Certificate Number: H14NM Make: Helicopter Transport Services Model: CH-54B

Description of the Type Design Change: Fabrication and installation of Helicopter Transport Services, Inc.

(HTSI) Automatic Flight Control System (AFCS) in accordance with HTSI Master Drawing List No.

HTS-AFCSMDL-54B-001, Revision B, dated June 29, 2005 and HTSI Installation Drawings, Document No.

HTS-AFCSSID-54B-001, Revision B, dated June 29, 2005, or later Federal Aviation Administration (FAA) approved revisions.

Limitations and Conditions: Approval of this change in type design applies to: the HTSI Model CH-54B only.

This approval should not be extended to other rotorcraft of this model on which other previously approved modifications are incorporated unless it is determined that the relationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that rotorcraft. Rotorcraft modified with this STC must be operated in accordance with an FAA approved copy of the Rotorcraft Flight Manual Supplement (RFMS), HTSI Document No.

HTS-AFCS-54B-001, Revision IR, FAA approved June 29, 2005, or later FAA approved revision. Rotorcraft modified in accordance with this STC must be maintained in accordance with HTSI Maintanence Manual Supplement, Document No. HTS-AFCSICA-001, dated January 26, 2004, or later FAA accepted revision. A copy of this Certificate, FAA approved RFMS and Maintenance Manual must be maintained as part of the permanent records for the modified rotorcraft.

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.

Date of application: January 30, 2003 Date reissued: January 9, 2014

Date of issuance: June 29, 2005 Date amended:

**FAA FORM 8110-2(10-68 PAGE 1 OF 2 PAGES**

(Signature)

Manager, Seattle Aircraft Certification Office (Title)

## Every issue (2)

- January 9, 2014: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/3a/67/3a6714887499f57cae7f4fc6d9db5650feadd8bcbe79395bce240b5802145c74)
- June 29, 2005: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/01/15/011504165fa92eecce4d3809c416840283940f8f013ceaefe847c016ef1db8eb)

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