Landing Gear Downlock Actuator
The Landing Gear Downlock Actuator is a critical safety component in the aircraft’s landing gear system. It ensures the main and nose landing gear remain securely locked in the extended (down) position during landing and ground operations.
Powered by hydraulic or electro-hydraulic systems, the actuator engages a mechanical lock once the landing gear is fully deployed, preventing uncommanded retraction. It transmits gear status signals to the cockpit via integrated sensors, providing pilots with real-time confirmation.
Built for durability, the actuator withstands high loads, pressure fluctuations, vibration, and repeated landing cycles. It is made of aerospace-grade alloys and is corrosion-resistant, designed for high-reliability operation across the aircraft’s service life.
The downlock actuator is part of the larger landing gear extension and retraction system, and it contributes directly to aircraft ground handling safety. Tested to FAA and OEM standards, this actuator plays an irreplaceable role in ensuring that the gear remains locked, even during system failure scenarios.

Company Overview
SM Tech Co., Ltd. located in Asan, Chungcheongnam-do, Republic of Korea, is a specialized manufacturer of high-precision components for the aerospace, defense, and space industries. Since its establishment, the company has built strong expertise in the design, machining, and assembly of critical mechanical and structural parts for both civil and military aircraft, helicopters, and space launch vehicles.
We are a trusted supplier for key domestic and international aerospace programs, including fighter jets, helicopters, and commercial aircraft. Our main products include actuators, landing gear components, hydraulic control systems, and precision-machined parts and assemblies, all designed to meet stringent quality and performance standards.
SM Tech is certified to AS9100D and ISO 9001, ensuring a robust quality management system that covers every stage of production—from raw material inspection to final product testing. We operate advanced manufacturing facilities equipped with CNC lathes, machining centers (MCT), and 5-axis machining capabilities, enabling the production of complex and high-tolerance components.
With a track record of indirect exports to major global aerospace companies, including components installed on Boeing commercial aircraft, SM Tech continues to expand its presence in the global market. Our commitment to continuous technological innovation, process improvement, and customer satisfaction allows us to provide reliable, high-quality solutions for the most demanding aerospace applications.