Engineering & Certification Services

Sterling Helicopter offers a full range of engineering services at our helicopter and airplane STC and repair station, these include STC development, Amended Type Certification support, Major Alterations, and Major Repairs. We also offer PMA manufacturing assistance for clients who own design data but either don’t have the tooling to manufacture parts or don’t have the FAA certification to do so. We have an on-staff airplane and helicopter DAR-F, DAR-T, and DERs of all disciplines.

Sterling provides free estimates for new projects and fast project tracking services that allow your new product to get to the market faster. Full Turn-Key STC packages are available that include all aspects of certification for your new product. We can also assist in foreign validations that include EASA, ANAC, TCCA, and many other civil aviation authorities. Our airplane and helicopter DAR-F AND DAR-T technicians and STC experts are here to assist you in getting the certification you need for your business. We can do this entirely or in part at our airplane and helicopter STC & repair station or your facility.  Contact us today at engineering@sterlinghelicopter.com or 812-972-9185 to discuss your project details.

Please view the information below for more details about all the services we offer.


Sterling Helicopter offers complete airplane and helicopter STC services on Part 23, 25, 27, and 29 aircraft. Our engineering capabilities reach far beyond customers’ expectations. This includes the entire STC process, from application to certification and marketing. We handle all the engineering and each piece in-between. Our airplane and helicopter STC services include designing, modeling, drawings, plans and reports, substantiation data, ground testing, flight testing, EMI testing, and post-STC issuance assistance.

Testing can be done at Sterling Helicopter’s STC and repair station, or we can travel to your facility. Sterling also holds FAA – PMA so once your STC is complete, we can manufacture parts that support your STC for you. If desired, these parts can also be shipped from us to you with an FAA 8130-3 tag. We have extensive experience in working with ACOs all over the country on certification projects. Let Sterling be your STC agent and deal with the FAA, so you don’t have to.

Sterling also manages foreign validations for its clients. If you have an FAA STC and would like an EASA STC, ANAC STC, or TCCA STC through validation we would be happy to assist.

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Sterling offers designing and manufacturing of structural mounting provisions for all types of aircraft, both rotor and fixed wing. These mounting provisions could be used for a variety of applications such as External or Internal LiDAR imaging systems, camera systems, special mission equipment, sensor packages, etc.

We can also ensure that these mounting systems are isolated from aircraft vibrations to protect the mission equipment. No need to have a design in mind, we can work with your idea to assist in the development of a system that will work for your equipment and flight needs.


Sterling offers designing services and 3D CAD parametric modeling, as well as 2D modeling for many aerospace designing needs. This includes models and technical details and assembly drawings. Sterling provides this technical data to its clients as part of an agreed service contract. We can assist you with your design needs at our airplane and helicopter STC and repair station.


Sterling offers custom-made wiring harnesses of many types. This airplane and helicopter electrical expertise can range from a harness that powers and controls a piece of equipment routed through the aircraft or custom-made battery cables.

These harnesses are built with MIL-Spec. aviation-grade wiring that is flammability tested. Wires can be laser part marked for ease of tracing and identification. Wiring harness termination at each end can be provided by Sterling or left open for ease of routing.

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Sterling certifies a wide range of external lighting that improves aircraft safety and night flight operations. We hold several STCs on aircraft external lighting.

If you have a need for brighter and more reliable landing lights, taxi lights, recognition lights, position lights strobe lights, or anti-collision lights, please reach out to engineering@sterlinghelicopter.com for a quote for our airplane and helicopter light installation experts to upgrade your aircraft today.

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After your service is completed, your aircraft is ready to be safely operated. Our priority is to keep your downtime to a minimum with timely responses and 24-hour accessibility. Our repairs of Airbus, Sikorsky, Agusta, MD, and Bell helicopters focus on safety and quality.


You want your helicopter in the hands of a company you can trust. Our team is factory trained and certified to deliver you with quality and versatility. Our constant communication and customer support exceeds your expectations and completes the repair quickly.


At Sterling Helicopter, you receive the best service at the most cost-effective prices. You can trust our technicians to work on your Airbus, Bell, Agusta, Sikorsky, and MD aircraft, addressing all issues quickly at a price that meets your budget. Get in touch with us to inquire about your helicopter maintenance needs.

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