STC SR02524SE

Number SR02524SE

This certificate, issued to Helicopter Transport Services, LLC 5806 SW Plumley St.

Corvallis, OR 97333

Part 29 of the Federal Aviation Regulations.

Original ProductType Certificate Number: H16NM Make: Helicopter Transport Services, LLC Model: CH-54A

Description of the Type Design Change: Installation of an electically driven oil cooler and 20KVA generators in accordance with Helicopter Transport Services, LLC (HTS) Master Drawing List (MDL) HTS-CH54A-MDL-001, Revision IR, dated May 23, 2016, or later Federal Aviation Administration (FAA) approved revision. Maintained in accordance with HTS Instructions for Continued Airworthiness (ICA) HTS-OCBICA-002, Revision A, dated October 13, 2016, or later FAA-accepted revision. Operated in accordance with HTS Rotorcraft Flight Manual Supplement (RFMS) FMS-HTS-OCB-002, Revision A, dated October 20, 2016.

Limitations and Conditions: Approval of this change in type design applies to the above model rotorcraft only.

This approval should not be extended to other of this rotorcraft model series unless the installer determines that the relationship between this change and any other previously incorporated approved modifications will introduce no adverse effect upon the airworthiness of that rotorcraft.

A copy of this certificate, the MDL, the ICA, and the RFMS 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 23, 2012 Date reissued:

Date of issuance: February 7, 2017 Date amended:

(Signature)

Manager, Seattle Aircraft Certification Office (Title)