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Date: Fri, 02 Mar 2012 07:54:16 -0500
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From: LenS790501@aol.com
Subject: MT Prop
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I=E2=80=99d like to share my experience with the MTV-12-B MT prop on my Lan=
cair =20
360. The prop has 696 hours. I bought my LNC2  almost 5 years ago from the =
=20
original builder here in Arizona. Shortly after the purchase, I noticed som=
e =20
grease seepage around the seals at the base of the blades. The builder said=
=20
MT  had said this was normal and not unusual. Unfortunately, it got worse t=
o=20
the  point it was getting on the canopy. The prop went to the prop shop=20
here in  Tucson (he=E2=80=99s certified by MT) and he sent it to Florida an=
d I was down=20
for 6  weeks. This was quite an expensive ordeal. The seepage has occurred=
=20
each year  I=E2=80=99ve owned the plane but the shop here has fixed it unde=
r =E2=80=9C
warranty=E2=80=9D with MT=E2=80=99s  latest =E2=80=9Cfix=E2=80=9D (obviousl=
y they are using a trial and error=20
method). This year  there was seepage again but not too severe, so I didn=
=E2=80=99t=20
remove the prop during  the conditional inspection (first time in 5 years).=
=20
The test flight after the  inspection went without a flaw. Two days later I=
=20
went to breakfast and after  returning was cleaning the plane and noticed=
=20
more grease than previously and  that one of the seals had split which=20
indicated relative motion between the  blade and the seal. I also noticed a=
 small=20
crack in the paint and what looked  like stress marks above the crack. Bein=
g=20
Sunday, I waited till the next morning  to call the prop shop and he came o=
ut=20
to look at the prop. He said I shouldn=E2=80=99t  even start the engine let=
 alone=20
fly the plane. He surmised by looking at the  blade that one or more of the=
=20
lag screws had broken or had come out. I removed  the prop and took it to h=
is=20
shop. Upon disassembly, he found the head of one of  the lag screws on the=
=20
blade with the split seal had sheared off and was bouncing  around in the=
=20
hub. Upon further inspection, a second lag screw in that blade was  found t=
o=20
have sheared off at its midpoint and all the remaining lag screws in  all=
=20
three blades were found to have loosened by at least =C2=BC of a turn. I wa=
s told =20
had I flown to Colorado, instead of breakfast, as I was planning to do in t=
wo=20
 days, there was a good possibility the blade would have come off the hub=
=20
in  flight, which is a rather sobering thought. I am awaiting the decision=
=20
from MT  as to what they will do to rectify the situation.=20
In the mean time, I have  ordered a Hartzell prop from Lancair and refuse=
=20
to put the MT prop back on my  plane no matter what MT does or says.

Len Spina
N15EG
Tucson
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color=3D#000000 size=3D2 face=3DArial>
<DIV>I=E2=80=99d like to share my experience with the MTV-12-B MT prop on m=
y Lancair=20
360. The prop has 696 hours. I bought my LNC2&nbsp; almost 5 years ago from=
 the=20
original builder here in Arizona. Shortly after the purchase, I noticed som=
e=20
grease seepage around the seals at the base of the blades. The builder said=
 MT=20
had said this was normal and not unusual. Unfortunately, it got worse to th=
e=20
point it was getting on the canopy. The prop went to the prop shop here in=
=20
Tucson (he=E2=80=99s certified by MT) and he sent it to Florida and I was d=
own for 6=20
weeks. This was quite an expensive ordeal. The seepage has occurred each ye=
ar=20
I=E2=80=99ve owned the plane but the shop here has fixed it under =E2=80=9C=
warranty=E2=80=9D with MT=E2=80=99s=20
latest =E2=80=9Cfix=E2=80=9D (obviously they are using a trial and error me=
thod). This year=20
there was seepage again but not too severe, so I didn=E2=80=99t remove the =
prop during=20
the conditional inspection (first time in 5 years). The test flight after t=
he=20
inspection went without a flaw. Two days later I went to breakfast and afte=
r=20
returning was cleaning the plane and noticed more grease than previously an=
d=20
that one of the seals had split which indicated relative motion between the=
=20
blade and the seal. I also noticed a small crack in the paint and what look=
ed=20
like stress marks above the crack. Being Sunday, I waited till the next mor=
ning=20
to call the prop shop and he came out to look at the prop. He said I should=
n=E2=80=99t=20
even start the engine let alone fly the plane. He surmised by looking at th=
e=20
blade that one or more of the lag screws had broken or had come out. I remo=
ved=20
the prop and took it to his shop. Upon disassembly, he found the head of on=
e of=20
the lag screws on the blade with the split seal had sheared off and was bou=
ncing=20
around in the hub. Upon further inspection, a second lag screw in that blad=
e was=20
found to have sheared off at its midpoint and all the remaining lag screws =
in=20
all three blades were found to have loosened by at least =C2=BC of a turn. =
I was told=20
had I flown to Colorado, instead of breakfast, as I was planning to do in t=
wo=20
days, there was a good possibility the blade would have come off the hub in=
=20
flight, which is a rather sobering thought. I am awaiting the decision from=
 MT=20
as to what they will do to rectify the situation. <BR>In the mean time, I h=
ave=20
ordered a Hartzell prop from Lancair and refuse to put the MT prop back on =
my=20
plane no matter what MT does or says.<BR></DIV>
<DIV>Len Spina</DIV>
<DIV>N15EG</DIV>
<DIV>Tucson</DIV></FONT></BODY></HTML>
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