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No. of STCs: 4

STC Holder: Yehnert Helicopters, Inc 1049 Airport Drive, Upland, CA 91786, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SE78WE	Status: Current	App Date:	Rev Date: 08/11/1976
Description: Install two locking pins in Franklin Part Number 21014J oil transfer collar, 180 degrees apart, to prevent rotation of oil seal in collar.
TC Nos.: E9EA
Models: Wytwornia Sprzetu Komunikacyjnego6A-350-C1, 6A-350-C1A, 6A-350-C2
ACO: AIR-770: West Certification Branch LA

STC Holder: Yehnert Helicopters, Inc 1049 Airport Drive, Upland, CA 91786, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH3556NM	Status: Current	App Date:	Rev Date: 12/17/1986
Description: Installation of low profile instrument panel.
TC Nos.: H3WE
Models: MD Helicopter Inc.369D, 369H, 369HE, 369HS
ACO: AIR-770: West Certification Branch LA

STC Holder: Yehnert Helicopters, Inc 1049 Airport Drive, Upland, CA 91786, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH4544NM	Status: Current	App Date:	Rev Date: 08/31/1994
Description: Modification of engine inlet fairing.
TC Nos.: H3WE
Models: MD Helicopter Inc.369E
ACO: AIR-770: West Certification Branch LA

STC Holder: Yehnert Helicopters, Inc 1049 Airport Drive, Upland, CA 91786, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SR00135LA	Status: Current	App Date: 11/22/1994	Rev Date: 12/15/1995
Description: Installation of Yehnert Tail Rotor Blades YH-278 as replacements for Hiller Tail Rotor Blades 55073.
TC Nos.: 4H10, 4H11
Models: Hiller AviationUH-12D (Army UH-23D) Rogerson Hiller CorporationUH-12E, UH-12E-L
ACO: AIR-770: West Certification Branch LA