# STC SR09535RC-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: BLR Aerospace LLC., United States
- Description: Installation of a Dual Tailboom Strakes and FastFin System
- Applied: February 2, 2010
- Status date: August 23, 2018
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS H79EU](https://openairdocs.org/tcds/H79EU), [TCDS H4SW](https://openairdocs.org/tcds/H4SW)
- Certificate PDF: https://openairdocs.org/files/sha256/85/1f/851f50fc6ecf6000eca30a1785c1922680942ced29fc7044dc4211ef6c348f0c
- Approved model list and other attachments: [AML_SR09535RC-D.pdf](https://openairdocs.org/files/sha256/24/2c/242cbe97368c586461b2f9da7ce40bda3e777ba61adc4ed449cda297a951f42d)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/16BECFEF6FDCF9D5862582F700647D40.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SR09535RC-D

## ADs that name it (0)

None.

## Approved models (5)

- Agusta S.p.A. AB412 ([TCDS H79EU](https://openairdocs.org/tcds/H79EU))
- Agusta S.p.A. AB412 EP ([TCDS H79EU](https://openairdocs.org/tcds/H79EU))
- Bell Helicopter Textron Inc. 412 ([TCDS H4SW](https://openairdocs.org/tcds/H4SW))
- Bell Helicopter Textron Inc. 412CF ([TCDS H4SW](https://openairdocs.org/tcds/H4SW))
- Bell Helicopter Textron Inc. 412EP ([TCDS H4SW](https://openairdocs.org/tcds/H4SW))

## 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 ited S tates of Am erica Department of Transportation - Federal Aviation Administration Supplemental Type Certificate

Number SR09535RC-D

This certificate, issued to BLR Aerospace, LLC 11002 29th Ave. West Everett, WA 98204

Part * of the * Regulations.

Original ProductType Certificate Number: * See attached Federal Aviation Administration (FAA) Make: Approved Model List (AML) SR09535RC-D for approved Model: aircraft models and applicable airworthiness regulations

Description of the Type Design Change: Installation of a Dual Tailboom Strakes and FastFin System in accordance with the applicable installation manual as listed on AML SR09535RC-D. Instructions for Continued Airworthiness, Report No. BLR-412FF-950, Revision C, dated April 21, 2015, or later FAA-accepted revision, is required. Rotorcraft modified must be operated in accordance with an FAA-approved copy of the Rotorcraft Flight Manual Supplements (RFMS) as listed on AML SR09535RC-D.

Limitations and Conditions: Approval of this change in type design applies to the rotorcraft listed on AML SR09535RC-D 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 by the installer that the relationship between this change and other previously approved modifications will introduce no adverse effect upon the airworthiness of that rotorcraft. A copy of this certificate, AML SR09535RC-D, and the applicable rotorcraft flight manual supplement and installation manuals as listed on AML SR09535RC-D must be maintained as part of the permanent records for the modified rotorcraft.

Date of application: February 2, 2010 Date reissued: January 20, 2011; August 23, 2018 Date of issuance: May 27, 2010 Date amended: November 4, 2010; August 29, 2013 September 2, 2015

FAA FORM 8110-2 (5/14) PAGE 1 OF 4 PAGES By direction of the Administrator

(Signature)

Manager, Seattle ACO Branch (Title)

Un ited S tates of Am erica Department of Transportation - Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SR09535RC-D BLR Aerospace, LLC Issued: May 27, 2010 Reissued: January 20, 2011; August 23, 2018 Amended: November 4, 2010; August 29, 2013; September 2, 2015

The installer must determine whether this design change is compatible with previously approved modifications. If the holder agrees to permit another person to use this certificate to alter a product, the hol der must give the other person written evidence of that permission.

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.

Certification Basis:

Based on 14 CFR Part 21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48, the certification basis for Bell Models 412EP, 412CF, and 412 helicopters for Dual Tail Boom Strake (DTBS) and Fast Fins System (FFS) installation is as follows:

a. The type certification basis for Bell Models 412EP, 412CF, and 412 helicopters is shown on TCDS H4SW for parts not changed or not affected by the change.

b. The type certification basis for Agusta S.p.A Models AB412 and AB412EP helicopters is shown on T CDS H79EU for parts not changed or not affected by the change.

c. The certification basis for parts changed or affected by change since the reference date of application, February 02, 2010, is based on 14 CFR Part 21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48.

The certification basis for this modification was determined to be:

Regulations at the latest amendment:

Subpart D

29.629 Amendment Level 29-40 Appendices A29.4 Amendment Level 29-27 Regulations at Intermediate amendment:

Subpart C

29.571 Amendment Level 29-20

**FAA FORM 8110-2 (5/14) PAGE 3 OF 4 PAGES**

Un ited S tates of Am erica Department of Transportation - Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet)

Number SR09535RC-D

BLR Aerospace, LLC Issued: May 27, 2010 Reissued: January 20, 2011; August 23, 2018 Amended: November 4, 2010; August 29, 2013; September 2, 2015

Certification Basis continued:

Regulations at the amendment level in TCDS H4SW:

Subpart B

29.21, 29.25, 29.27(c), 29.141, 29.143, 29.171, 29.173, 29.175, 29.241, 29.251

Subpart C

29.301, 29.303, 29.305, 29.307

Subpart D

29.601, 29.603, 29.605, 29.609, 29.613, 29.619, 29.625, 29.672(c)

Subpart G

29.1529, 29.1581, 29.1585(a), 29.1587(b)(2)(4)

Appendices

829.1, 829.3, 829.4, 829.5, 829.6, B29.7

- END -

**FAA FORM 8110-2 (5/14) PAGE 4 OF 4 PAGES**

### AML_SR09535RC-D.pdf

FEDERAL AVIATION ADMINISTRATION (FAA) APPROVED MODEL LIST (AML) SR09535RC-D FOR BLR AEROSPACE, LLC DUAL TAILBOOM STRAKES AND FASTFIN® SYSTEM ISSUE DATE: August 29, 2013

Page 1 of 2

**ITEM ROTORCRAFT MAKE**

**ROTORCRAFT MODEL**

**ORIGINAL TC NUMBER**

**INSTALLATION MANUAL1 FAA APPROVED ROTORCRAFT FLIGHT**

**MANUAL SUPPLEMENT**

**FAA APPROVED**

**ROTORCRAFT MASTER**

DRAWING LIST AML REV DATE Number Revision1 Number Revision1

1. Bell Helicopter Textron Inc.

412EP H4SW BLR-412TBS-030 Revision B, dated 4/21/2015; and BLR-412FF-030 Revision B, dated 4/21/2015

RFMS-412FF-1 Revision A, dated 10/21/2010 BLR-412FF-040 Revision B, dated 4/24/2015 10/9/15

2. Bell Helicopter Textron Inc.

412CF H4SW BLR-412TBS-030 Revision B, dated 4/21/2015; and BLR-412FF-030 Revision B, dated 4/21/2015

RFMS-412FF-2 Revision A, dated 10/21/2010 BLR-412FF-040 Revision B, dated 4/24/2015 10/9/15

3. Bell Helicopter Textron Inc.

412 H4SW BLR-412TBS-030 Revision B, dated 4/21/2015; and BLR-412FF-030 Revision B, dated 4/21/2015

**RFMS-412FF-32**

**RFMS-412FF-43**

**RFMS-412FF-54**

Rev. IR, dated 10/22/2010 Rev. A, dated 8/20/2013 Rev. IR, dated 10/22/2010 BLR-412FF-040 Revision B, dated 4/24/2015 10/9/15

4. Agusta S.p.A AB412 H79EU BLR-412TBS-030 Revision B, dated 4/21/2015; and BLR-412FF-030 Revision B, dated 4/21/2015

**RFMS-412FF-75**

RFMS-412FF-85 Rev. IR, dated 8/11/2015 Rev. IR, dated 8/11/2015 BLR-412FF-040 Revision B, dated 4/24/2015 10/9/15

FEDERAL AVIATION ADMINISTRATION (FAA) APPROVED MODEL LIST (AML) SR09535RC-D FOR BLR AEROSPACE, LLC DUAL TAILBOOM STRAKES AND FASTFIN® SYSTEM ISSUE DATE: August 29, 2013

Page 2 of 2

**ITEM ROTORCRAFT MAKE**

**ROTORCRAFT MODEL**

**ORIGINAL TC NUMBER**

**INSTALLATION MANUAL1 FAA APPROVED ROTORCRAFT FLIGHT**

**MANUAL SUPPLEMENT**

**FAA APPROVED**

**ROTORCRAFT MASTER**

DRAWING LIST AML REV DATE Number Revision1 Number Revision1

5. Agusta S.p.A AB412EP H79EU BLR-412TBS-030 Revision B, dated 4/21/2015; and BLR-412FF-030 Revision B, dated 4/21/2015

RFMS-412FF-66 Rev.IR, dated 8/11/2015 BLR-412FF-040 Revision B, dated 4/24/2015 10/9/15

1 Or later approved FAA Revision.

2 For BHTI Model 412 S/N 33001-33107.

3 For BHTI Model 412 S/N 33108-33213 and 36001-36019. S/N 33001-33107 are eligible only if BHTI Technical Bulletin 412-84-44 is embodied.

4 For BHTI Model 412 S/N 36020-36086.

5 For Agusta S.p.A. Model AB412 operating to Agusta Flight Manual AB412 6 For Agusta S.p.A. Model AB412EP operating to Agusta Flight Manual AB412 & Appendix 20 or Flight Manual AB412 & Appendix 20 and 24

FAA Approved:

Manager, Seattle Aircraft Certification Office AMENDED: September 2, 2015; September 11, 2015 REISSUED: October 9, 2015

## Every issue (5)

- August 23, 2018: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/85/1f/851f50fc6ecf6000eca30a1785c1922680942ced29fc7044dc4211ef6c348f0c), [AML_SR09535RC-D.pdf](https://openairdocs.org/files/sha256/24/2c/242cbe97368c586461b2f9da7ce40bda3e777ba61adc4ed449cda297a951f42d)
- October 9, 2015: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/fc/ff/fcff44aa38cde81162399ae68b15c6ac0319af12aad053a1de7d42d88327a8c6), [AML_SR09535RC-D.pdf](https://openairdocs.org/files/sha256/24/2c/242cbe97368c586461b2f9da7ce40bda3e777ba61adc4ed449cda297a951f42d)
- September 2, 2015: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/fc/ff/fcff44aa38cde81162399ae68b15c6ac0319af12aad053a1de7d42d88327a8c6), [AML_SR09535RC-D.pdf](https://openairdocs.org/files/sha256/6e/97/6e9711542584d1703e7cdb57a3cfe30bc1ed9857d4af8263ec7e9b0cae0c3094)
- August 29, 2013: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/bc/1a/bc1a242190601b9c0658ef65bae6470b5c7f950b466cc600602d64181c371197), [AML_SR09535RC-D.pdf](https://openairdocs.org/files/sha256/c1/67/c1678c6fa15d214c429b3519a13e271bbf5904d684628d5aff738c8684b27f51)
- January 20, 2011: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/11/0a/110a26c1824c0e5911c75d208045974378aff71f747f3e05fd04c8962dfe50c1)

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