STC SR00135LA

United States of America 8103 Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SR00135LA This certificate issued to: 1049 Airport Drive Yehnert Helicopter, Inc.

Upland, California 91786 Part " of the " Regulations.

Original Product - Type bertificale Number: * *See attached FAA Approved Model List (AML) No.

Make: * SR00135LA for list of approved helicopter models and Model: * applicable airworthiness regulations.

Description of Type Design Change: Installation of Yehnert Tail Rotor Blades YH-278 as replacements for Hiller Tail Rotor Blades 55073, in accordance with FAA approved Installation Instructions, as listed on AML No.

SR00135LA, dated December 1, 1995, or later FAA approved revision.

Limitations and Conditions: The service lives of the Yehnert tail rotor blades have been established in accordance with FAR 27.571 (e) at the specified time-in-service, with periodic inspections required, as listed in Table 1 of the AML. These inspections shall be conducted in accordance with Yehnert Report YH-307, dated December 1, 1995, or later FAA approved revisions. A copy of this Certificate and FAA Approved Model List (AML) No.

SR00135LA, dated December 1, 1995, or later FAA approved revision, must be maintained as part of the permanent records for the modified aircraft.

This approval should not be extended to aircraft of these models 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 aircraft.

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