MT-Propeller - The Winner's Propeller

May, 2018
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STC M7 Aerospace LP SA227


  • M7 Aerospace LP SA227-AC (Metro III) with 5-blade MTV-27
  • Metro III with 5-blade MTV-27

STC - Data


  • Type of Aircraft: SA226/SA227

  • EASA: 10015216 (issued Dec 2011)
  • FAA: SA03893AT (issued July 24, 2013)
  • TCCA Canada: Letter of acceptance
    to the EASA STC 10015216 (former EASA.A.S.03631)
  • DGAC Mexico: Validation No. IA-237/2013 (issued Nov 4, 2013)
  • INAC Venezuela: Letter of Acceptance of the FAA STC (issued Dec 22, 2016)

  • Applicable Aircraft: M7 Aerospace LP SA226-T(B), SA 227-TT, -AC,
    -AT, -CC, -BC, -DC
  • Engines:TPE331-10U-( ), TPE331-11U-(), TPE331-12UA-()
    TPE331-12UAR-(), TPE331-12UHR-()
  • Propeller: MTV-27-1-E-C-F-R(G)/CFRL250-103

  • Advantages:
  • Best vibration damping characteristics for almost
    vibration free propeller operations!
  • Bonded on nickel alloy leading edge
    for best erosion protection of the blades!
  • No engine modifications
    (no cam or beta tube change)!
  • Ground roll distance reduced by approx. 50 m (165 ft)!
  • Take-off distance over 50 ft obstacle
    reduced by approx. 80 m (260 ft)!
  • Two engine and single engine climb performance
    slightly improved by up to 80 ft/min!
  • Cruise performance slightly improved by up to 2 kts!
  • Approx. 20 lbs less weight
    than the removed original McCauley Propeller and
  • Approx. 65 lbs less weight than
    the Dowty Rotol Propeller!
  • Unlimited blade life, FOD repairable blades!
  • More ground clearance for less FODs!
  • Significant inside and outside noise reductions!
  • Aircraft noise level is about 5 dB(A) less
    than with the original metal propellers!
  • Cabin noise is reduced by 3 to 4 dB(A) depending on location!
  • Cooler ITTS during engine start up
    due to a shorter starting time of 1/3!

more information about the STC (.pdf 75k)