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MT-Propeller Earns EASA STC for PT6A-135 Engine in Piper Meridian

Updated: Jul 8

Piper Meridian with new PT6A-135A engine and 5-blade MT propeller

MT-Propeller has achieved EASA certification to replace PT6A-42A engines with the PT6A-135A engine in conjunction with a 5-blade MT propeller.


The company holds more than 220 STCs to install MT-Propellers with up to 7 blades. The 5-bladed propeller is mandatory for this STC, and when a 5-blade Quiet Fan Jet MTV-27 propeller is already installed, it can also be used on this conversion.


Advantages of the engine replacement:


Efficiency: RANGE:Max. range with max fuel (ISA, MTOW, no wind, one pilot, 45 min fuel reserve)


  • 203 KTAS cruise speed: 1340NM (2479km) @ 30000ft

  • 203 KTAS cruise speed: 1290NM (2387km) @ 28000ft

  • 240 KTAS cruise speed: 1160NM (2146km) @ 28000ft

  • 258 KTAS cruise speed: 960NM (1776km) @ 25000ft



Reduction of Maintenance Costs: Changing the engine family from the mid-size to the small-size category, results in a significant difference in operating costs. Direct cost per mile will be similar to the PA46-350P Lycoming-powered Mirage, but with a top speed of up to 260 KTAS @ 30,000 ft.


Noise reduction: The speed of the new engine is 1900 rpm compared to the original speed of 2000 rpm. which reduces noise from the original 74.9 db(A) to 66.9 db(A).


The MT-Propeller STC Kit contains the following parts:


  • 1 new engine P&W PT6A-135A

  • 1 new propeller MTV-27-()/CFR203-58d

  • 1 new set of exhaust pipes

  • 1 new set of airbox parts

  • 1 new bracket set for the engine power control interface


The system does require a Garmin EIS System at a minimum.

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