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FAA approves five-blade MT prop for Beech aircraft
MT-Propeller is the holder of 220 STCs worldwide and supplies 90 per cent of the European aircraft industry as well as 30 per cent of the US aircraft industry. Beech aircraft can now be kitted out with five blades.
MT says the Beech 1900, 1900C and 1900D upgrade is a smart move.

MT-Propeller Entwicklung has received FAA STC for the installation of its MTV-27-1 Quiet Fan Jet composite propeller on Beech 1900, 1900C and 1900D models powered by Pratt & Whitney PT6A-65B or -67D propeller turbine engines. This installation is already supplemental type certified by EASA and TCCA.

MT-Propeller president Gerd Muehlbauer states that the installation features the following advantages compared to the original four-blade propellers: “The five-blade MT-Propeller has a smaller diameter of about eight inches compared to the original four-blade propeller, which means greater ground clearance of about four inches for less FOD and also more clearance to the fuselage and therefore less cabin noise from the prop tips. Take-off of the Beech 1900 is improved by four per cent, so compared to the original AFM a higher safety for the calculated take-off run. The MTV-27 has no propeller ADs, and the five-blade MT-Propeller reduces propeller noise by up to 5 dB(A). The MTV-27 also has bonded on wide chord nickel alloy leading edges for superior erosion protection of the blades.

“TBO for the MT-Propeller is 4,500 hours or six years, whatever comes first, for low maintenance costs. No intermediate inspections are needed between the TBO which requires the propeller removal. This comes with reduced costs for spare parts, like blades and lower overhaul costs, for the complete propeller assembly, and there is no RPM restriction for the complete operational range.”

Other News
EASA ticks Cessna 414A with four-blade MTV-14
November 26, 2023
The installation of the four-blade props provide a shorter take off distance, enhanced climb and cruise performance and less weight than the original propellers.
FAA awards STC for three-blade MTV-12 prop for Piper PA-23
November 20, 2023
The installation of the three-blade MT-Propeller provides best vibration damping characteristics for almost vibration free propeller operation. The installation is already certified by EASA.
AFAC Mexico validates EASA STC for five-blades on King Air 90
November 17, 2023
The installation of the five-blade propellers provides general performance improvement with no propeller speed restrictions on ground while operating in low idle, and significantly lower cabin noise and vibration.