last update June, 2022
STC M7 Aerospace LP SA227
Metro III with 5-blade MTV-27
STC - Data
Type of Aircraft:
(issued Dec 2011)
(issued July 24, 2013)
Letter of acceptance
to the EASA STC 10015216 (former EASA.A.S.03631)
Validation No. IA-237/2013
(issued Nov 4, 2013)
Letter of Acceptance
of the FAA STC
(issued Dec 22, 2016)
M7 Aerospace LP SA226-T(B), SA 227-TT, -AC,
-AT, -CC, -BC, -DC
TPE331-10U-( ), TPE331-11U-(), TPE331-12UA-()
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!
about the STC (.pdf 75k)