STC SR11844CH

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number 

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HARTZELL PROPELLER LLC

ONE PROPELLER PLACE PIQUA, OHIO 45356-2634 Part 27 Title 14 of the Code of Federal Regulations Airbus Helicopters Deutschland GmbH *See continuation sheet 3 of 3 H88EU Installation of Heli-Preheat Kit, p/n TA3391-(l, 10) for 115 volt application or p/n TA3391-(2,

20) for 230 volt application in accordance with Heli-Preheat Kit drawing TA339l-( ) Revision G, dated March 26, 2026 or later FAA-approved revision, and Heli-Preheat Kit Installation Instruction TNH3391 Revision D, dated September 05, 2025 or later FAA-approved revision.

1. The installer must determine whether this design change is compatible with previously approved modifications.

2. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

(See Continuation Sheet 3 of 3) 12/20/23 11/25/24 8/12/26 Bo R. Landess STC ODA administrator Hartzell Propeller ODA-100082-CE 3

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EC135P1, EC135T1, EC135P2, EC135T2, EC135P2+, EC135T2+, EC635T2+, EC135P3, EC135T3 (Continued from Page 1: Limitations and Conditions)

3. FAA-accepted Instructions for Continued Airworthiness (ICA) document# TCA1000 Revision D, dated August 7, 2023 or later FAA approved revisions, and Operating Guide document# TPG1000 Revision F, dated August 7, 2023 or later FAA approved revision are required.

4. A copy of this certificate must be maintained as part of the permanent records for the modified rotorcraft.

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