7-Blade Whisper Prop for King Air 300 Series Aircraft Receives FAA and EASA Approval

BLR Aerospace LLC has announced that MT-Propeller Entwicklung GmbH (Atting, Germany) has received Supplemental Type Certificate (STC) approval from both the Federal Aviation Administration (FAA) and the European Union Aviation Safety Agency (EASA) for the 7-blade Whisper Prop system, now available for the King Air 300 series aircraft. As co-host of the King Air Gathering 2025 in Phoenix, BLR will showcase the new propeller in person.

The new 7-blade Whisper Prop is the quietest propeller available for the King Air 300 series. Its design is built on MT’s Natural Composite technology, previously used in the 5-blade propeller for the King Air platform. Each blade features a structural resin-infused wood core wrapped in carbon fiberglass composite skins.

“After years of commercial success with the 5-blade Whisper Props, we are proud to offer our customers the added option of the extremely quiet 7-blade Whisper Prop,” said Clay Bringhurst, president of BLR Aerospace.