FAA OKs the MT Silent 7

Finnoff Aviation Products, Broomfield Colorado

March 2021: We have just received the following announcement from MT Propeller in Straubing Germany.

World’s first 7-bladed Propeller for General Aviation is now Supplemental Type Certified by FAA STC SA02742NY on the Pilatus PC-12 powered by a Pratt & Whitney P&WC PT6A-67B or PT6A-67P propeller turbine.
(PT6A-67P Engine Installation according to EASA STC 10065179 and FAA STC SA02266LA)

The Silent 7 defines a new level of comfort, performance, so far never experienced on any turboprop aircraft before.

When starting developing the world’s first 7-bladed propeller for General Aviation in 2016 MT-Propeller had the same vision like in year 1999 when we came up with the first 5-bladed prop for turbo props. The 5-bladed prop became an industrial standard with more than 2500 propeller sold for various kinds of turbo props and it is still an ongoing success story. The 7-bladed propeller is pushing the new limits for certain applications to go beyond the achievement of the 5-bladed propellers.

The Silent 7 has already received its Supplemental Type Certified on the PC12 by EASA (European Union Aviation Safety Agency):  STC 10014953 R3.

MT-Propeller Vice President Martin Albrecht says that the installation of the 7-bladed MT-Propeller on the propeller turbine driven aircraft PC-12 features the following advantages:

  • No engine modifications necessary
  • Certified Ground roll distance reduced by approx. 10%; AFMS amended
  • Certified Take-off distance over 50 ft obstacle reduced by approx. 15%; AFMS amended
  • Climb performance improved
  • Aircraft noise level is about 4-6 dB(A) less than with the original metal propeller
  • Cabin noise is reduced by 6 to 7 dB(A) depending on seating location
  • Comply with the strict German noise regulations 2010 – “Landeplatz Lärmschutz Verordnung“ for unrestricted airport operations in Germany and other European Countries!

Due to the smaller diameter the 7-bladed MT-Propeller for the Pilatus PC-12 has more ground clearance for less blade tip erosion and FODs.

The MT-Propeller natural composite blades provide significant inside and outside noise reduction. They have no life limitation and are repairable in case of an FOD.

They also provide best vibration damping characteristics for almost vibration free propeller operation and have bonded on nickel alloy leading edges for superior erosion protection of the blades.

MT-Propeller is the world leading natural composite propeller manufacturer with 30 certified propeller models from 2-blade to 7-blade hydraulically controlled variable pitch propeller, for engines producing up to 5000hp.

The high performance, light weight and durable MT-Propellers can be used on aircraft with piston engines and propeller turbines, as well as on airships, wind tunnels and hovercraft. MT-Propellers can be developed for nearly every aircraft type from motor gliders to regional airliners.

Fulfilling the highest certification requirements they are also Supplemental Type Certified on Part 25 aircraft.

A Factory Certified Network of 62 Authorized Service Centers provides the best service and maintenance throughout the world.

Finnoff Aviation Products is the Exclusive Distributor for most of the world for the MT 7-bladed propeller. MT Propeller Germany is the Exclusive Distributor for Europe and Germany.

For more information on the Silent 7 MT Propeller for the PC-12 contact:

Finnoff Aviation Products:

Phone: +1 303-444-0552

Email: [email protected]

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