TimRVator(at)comcast.net
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 Posted: Mon Jul 31, 2017 2:18 pm Post subject: MT prop governor failure - results of discussion with MT rep |
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As some have noted, MT's service bulletin 31
(http://www.mt-propeller.com/pdf/sbs/sb31.pdf) says the MT governor
flyweight failure problem applies to engines "modified with electronic
ignitions or higher compression pistons." At least one of the RVs that
had an MT governor fail had dual magnetos and stock pistons. It's been
reported on VAF that this has been brought to MT's attention. MT has not
changed the service bulletin in the intervening months.
Based on MT's unwillingness to honestly describe the failure condition
in their service bulletin, I lost confidence in MT and pulled the MT
governor from my plane in January. I replaced it with a PCU 5000, which
has noticeably better performance than the MT governor (the PCU doesn't
have the rpm hunting that the MT had).
At OSH this year, I spoke with MT about the fact that their SB is
misleading, in that there have been failures in engines without either
electronic ignition or high compression pistons. It was amazing to hear
the blamestorming from the German-accented MT rep at OSH. "What about
McCauley governor failures" "What about Whirlwind propeller failures." I
pointed out that the issue at hand was MT's failure to publish an
honest, complete service bulletin. The MT rep continued to attack other
products, rather than address MT's Service Bulletin shortcomings.
I'm glad I got rid of the MT governor on my plane several months ago.
Based on the behavior of MT on this issue, I'll advise all prospective
builders I meet not to use MT products.
--
Tim Lewis -- HEF (Manassas, VA)
A&P
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 960 hrs
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