STC SR00288SE

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SRO0288SE This certificate issued to: Columbia Helicopters P.O Box 3500 Portland, OR 97208 Certifies that the change in the type design for the following product with the limitations and conditions therefor as specified herean meets the airworthiness requivements of Part 29 of the FederalRegulations, dated February 1, 1965.

Original Product -Type Certificate Number: H9EA Make: Boeing Vertol Model: BV-234UT Description of Type Design Change: Modification of the internal auxiliary fuel tank from a dry-cell type to a wet-cell type per Columbia Helicopters, Inc. Drawing List 234-77, Revision A, dated February 6, 1996, or later FAA approved revision. The modification requires the removal of the original fuel bladder, installation of rigid internal baffles, internal sealing of the tank, and the application of an external vapor containment coating.

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

This approval should not be extended to 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 any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate and the Rotorcraft Flight Manual Supplement (RFMS), dated March 6, 1996, must be maintained as part of the permanent records for the modified aircraft.

Date of Application: June 12, 1992 Date Reissued:

Date of Issuance: ; March 6, 1996 Date Amended:

FEDERA VIATION By Direction of the Administrator Veria (Signature) *OMINIST RATION Acting Manager, Seattle Aircraft Certification Office (Title)

FAA FORM 8110-2(10-6B)