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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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 Posted: Mon Jul 31, 2017 4:19 pm Post subject: MT prop governor failure - results of discussion with MT re |
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I agree that the service bulletin is misleading. However, while my
engine is pure stock, with 8.5:1 pistons and Bendix S1200 mags, MT both
acknowledged my MT governor was in the group subject to failure, even
though it is an 860-5, not an 860-3; and they performed the service
bulletin on it for me. My cost was only shipping. The revised governor
does have crisper control of rpm. Note that a significant portion of
both brands are manufactured at the same place, by the same company.
Kelly
On 7/31/2017 3:17 PM, Tim Lewis wrote:
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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).
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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kearney
Joined: 20 Sep 2008
Posts: 563
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| Posted: Mon Jul 31, 2017 5:59 pm Post subject: Re: MT prop governor failure - results of discussion with M |
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Hi Kelley
When this debacle started I spoke to APS and confirmed that the PCU5000x and MT governors have no parts in common. They are different designs. If I recall the conversation correctly, when MT started with their own design, they also started their own manufacturing.
Cheers
Les
C-GCWZ Flying
C-GROK Some assembly required
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