Timberline Aerospace

Upgrades for Utility Helicopter Operators

Who we are:

Timberline Aerospace, LLC, based in Sandpoint Idaho, certifies, and manufactures aircraft upgrades and modifications with a focus on utility helicopters and equipment.

Founded in 2018 as an affiliate of Timberline Helicopters, Inc., we have received several STC’s and have several more pending to modify the UH-60, MD500, Bell 205, 206, 407, 212, 412, and Airbus AS-350 helicopters to better equip them for utility missions.  Timberline’s in-house design and engineering capabilities include certification personnel who work with local Designated Engineering Representatives and the Aircraft Certification Office to move projects through the STC process efficiently.

Our manufacturing capabilities have grown to include CNC machining, composite construction, and complex structural assemblies. In 2019, we received FAA Parts Manufacturing Approval allowing in-house production of our STC kits.

Upgrades We Offer

UH-60A Purge Fuel Collector System


During shutdown of the GE T-700/701 engines installed in the UH-60 helicopter, the fuel nozzles are purged with bleed air to prevent coking. This fuel is vented overboard and dumped on the ground creating an environmental issue in many jurisdictions. Timberline Aerospace has developed the Purge Fuel Collector System to capture this fuel and prevent it from being released into the environment. The system meets US Forest Service Call When Needed and Exclusive Use contract requirements. Installation is approved via an STC Approved Model List currently including UH-60A, EH-60A, and HH-60L models for various Type Certificate holders.

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Locking Fuel Cap Cover


Developed as an alternative to expensive and problematic locking fuel caps, the locking fuel cap cover is an economical and simple solution. It helps prevent introduction of foreign materials into the fuel system as well as deterring unauthorized access to fuel ports. For fleet operators there is an option for all keys to be alike reducing the burden of lost/misplaced keys. Currently, the following models are approved via the following STC Approved Model List.

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UH-60A 34.5 Beam Modification


Operators of the UH-60A have long known of cracks developing in the stress concentration where the Station 308 frame joins the 34.5 cabin roof beam. Previously repairing this cracking required the replacement of the entire 308 Frame, a time consuming and expensive process. Timberline Aerospace has engineered a modification kit that is more economical and much simpler to install. This modification can be installed prior to cracks being detected or, in specific cases, after a crack in the 308 Beam Tab has been discovered. Installation requires approximately 50 man hours for each 308 to 34.5 junction and must be completed by or supervised by Timberline approved personnel. Install teams are available to expedite the process and ensure maximum availability of an aircraft. The modification is currently approved via STC Approved Model List on 11 different models of the UH-60 for different Type Certificate Holders.

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UH-60A External Fixed Provisions Kit

STC Pending

Utility helicopter missions often require externally mounted equipment. The Timberline Aerospace External Fixed Provisions Kit gives operators multiple approved external mounting points to attach mission related equipment and furnishings. Consisting of a set of five separate belly mounted points and two points mounted outside the cabin 308 beam, the options are endless.

Additional Telemetry Unit

STC Pending

Timberline Aerospace is working in partnership with Trotter Controls to certify the DataVault (c) telemetry system in the UH-60/S-70 series and Kaman K-1200 helicopters. This system will meet all USFS telemetry requirements with a simple installation and proven equipment design.

Get in touch with Timberline Aerospace

Timberline Aerospace is ready to upgrade your fleet, with the experience and flexibility to work with your unique needs. Get in touch today and a representative will get back to you to begin the process!