# STC SR02503SE - Type: Supplemental type certificate - Status: Current, Issued - Holder: Helicopter Transport Services LLC, United States - Description: Installation of Additional Telemetry Unit (ATU) - Applied: August 31, 2015 - Status date: September 15, 2016 - Product: Aircraft, Rotorcraft - Certification basis: Part 21, Part 29 - Data sheets: [TCDS H6EA](https://openairdocs.org/tcds/H6EA), [TCDS H16NM](https://openairdocs.org/tcds/H16NM), [TCDS R00009SE](https://openairdocs.org/tcds/R00009SE), [TCDS H14NM](https://openairdocs.org/tcds/H14NM) - Certificate PDF: https://openairdocs.org/files/sha256/a9/7c/a97c7ae911a157d099cf22ae85c6737435f5ce1f611c4626df0325657ac154f2 - Approved model list and other attachments: [AML SR02503SE.pdf](https://openairdocs.org/files/sha256/cc/28/cc2833452c79aa5b2c13671b3db6f0ad435ba3306857e8953a2aa79a579066bc) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C1CF3A0081CC55028625803300584C80.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SR02503SE ## ADs that name it (0) None. ## Approved models (4) - Erickson Incorporated DBA Erickson Air-Crane S-64E ([TCDS H6EA](https://openairdocs.org/tcds/H6EA)) - Helicopter Transport Services LLC CH-54A ([TCDS H16NM](https://openairdocs.org/tcds/H16NM)) - Helicopter Transport Services LLC CH-54A ([TCDS R00009SE](https://openairdocs.org/tcds/R00009SE)) - Helicopter Transport Services LLC 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. Number SR02503SE This certificate, issued to Helicopter Transport Services, LLC 14497 Keil Road NE Aurora, OR 97002 Part * of the * Regulations. Original Product Type Certificate Number: * See attached Federal Aviation Administration (FAA) Make: Approved Model List (AML) SR02503SE for approved Model: aircraft models and applicable airworthiness regulations Description of the Type Design Change: Installation of Additional Telemetry Unit (ATU) in accordance with master drawing list (MDL) as listed on the AML. Maintained in accordance with the instructions for continued airworthiness (ICA) as listed on the AML. Limitations and Conditions: Approval of this change in type design applies to the rotorcraft listed on AML SR02503SE 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 SR02503SE, the applicable MDL, and the applicable ICA, must be maintained as part of the permanent records for the modified aircraft. 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: August 31, 2015 Date reissued: Date of issuance: September 15, 2016 Date amended: (Signature) Manager, Seattle Aircraft Certification Office (Title) ### AML SR02503SE.pdf **FEDERAL AVIATION ADMINISTRATION (FAA) APPROVED MODEL LIST (AML) SR02503SE FOR** INSTALLATION OF ADDITIONAL TELEMETRY UNIT ISSUE DATE: September 15, 2016 Page 1 of 2 **ITEM ROTORCRAFT MAKE** **ROTORCRAFT MODEL** **ORIGINAL TC NUMBER** **CERTIFICATION** BASIS FOR ALTERATION*** **FAA ACCEPTED** **INSTRUCTIONS FOR** **CONTINUED AIRWORTHINESS** **FAA APPROVED MASTER** DRAWING LIST AML REV DATE Document Revision** Drawing Revision* 1. Helicopter Transport Services CH-54A H16NM Part 21 Section 21.25(a)(2) effective February 1, 1965, including Amendments 21-1 through 21-42 OAS-583-29.1529 Revision A, dated 9/1/16 OAS-583-MDL Revision D, dated 4/29/16 2. Helicopter Transport Services CH-54B H14NM FAR 21.25(a)(2) and (b) effective February 1, 1965, including amendments 21-1 through 21-42 and ASW-110 Memorandum dated September 8, 1993 OAS-583-29.1529 Revision A, dated 9/1/16 OAS-583-MDL Revision D, dated 4/29/16 3. Erickson Air Crane S-64E H6EA FAR 29, 1 February 1965, including Amendments 29-1 and 29-2 except FAR 29.855(d), and Special Conditions No. 29-014-SC OAS-583-29.1529 Revision A, dated 9/1/16 OAS-583-MDL Revision D, dated 4/29/16 **FEDERAL AVIATION ADMINISTRATION (FAA) APPROVED MODEL LIST (AML) SR02503SE FOR** INSTALLATION OF ADDITIONAL TELEMETRY UNIT ISSUE DATE: September 15, 2016 Page 2 of 2 **ITEM ROTORCRAFT MAKE** **ROTORCRAFT MODEL** **ORIGINAL TC NUMBER** **CERTIFICATION** BASIS FOR ALTERATION*** **FAA ACCEPTED** **INSTRUCTIONS FOR** **CONTINUED AIRWORTHINESS** **FAA APPROVED MASTER** DRAWING LIST AML REV DATE Document Revision** Drawing Revision* 4. Helicopter Transport Services CH-54A R00009SE 14 CFR Part 21, Section 21.25(a)(2) effective February 1, 1965, including Amendments 21-1 through 21-42 OAS-583-29.1529 Revision A, dated 9/1/16 OAS-583-MDL Revision D, dated 4/29/16 * Or later FAA Approved Revision ** Or later FAA accepted revision ***See Type Certificate Data Sheet for more information FAA Approved: Manager, Seattle Aircraft Certification Office AMENDED: REISSUED: ## Every issue (1) - September 15, 2016: Issued, Current. [certificate](https://openairdocs.org/files/sha256/a9/7c/a97c7ae911a157d099cf22ae85c6737435f5ce1f611c4626df0325657ac154f2), [AML SR02503SE.pdf](https://openairdocs.org/files/sha256/cc/28/cc2833452c79aa5b2c13671b3db6f0ad435ba3306857e8953a2aa79a579066bc) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.