BLR Aerospace LLC - MT-Propeller Receives King Air 300 Series 7-Blade Propeller FAA and EASA STC Approvals

Everett, Wash. — Mar. 19, 2025 — BLR Aerospace LLC, announced that MT-Propeller Entwicklung GmbH (Atting, Germany) has received STC approval from the Federal Aviation Authority (FAA) and the European Union Aviation Safety Agency (EASA) for the 7-blade Whisper Prop® system installed on the King Air 300 series aircraft, following a successful development program.

BLR is the worldwide distributor for MT-Propellers on the King Air and Beech 1900 platforms.

The new 7-blade Whisper Prop® is the quietest propeller available for the King Air 300 series. The design is built on the proven Natural Composite technology of the MT 5-blade propellers for the King Air platform. Each blade has a highly developed structural resin-infused wood core wrapped in carbon-fiberglass composite skins. The propeller is engineered for unparalleled quietness, durability, and efficiency.

"After years of commercial success with the 5-blade Whisper Props® we are proud to have the opportunity to present our customers with the additional option of the extremely quiet 7-blade Whisper Prop®," said Clay Bringhurst, president of BLR Aerospace.

The propeller stands out with its optimized seven-blade design, significantly reducing noise levels and minimizing vibration. The result is the quietest and smoothest experience for King Air 300 series operators and passengers alike.

About BLR Aerospace

BLR Aerospace, headquartered in Everett, Washington, provides performance-enhancing products now on more than 10,000 helicopters and airplanes worldwide and is endorsed by industry-leading OEMs such as Airbus Helicopters, Textron Aviation, Sikorsky Aircraft, and Bell Helicopters.

For more information on BLR King Air upgrades, visit BLR’s website at BLRaerospace.com or contact BLR's VP of Sales and Marketing, Chip Kiehn, at Chip@blraerospace.com.