Posted to the RV-List by Mark Phillips
I recently test flighted a new RV with an Aerosport IO-360, Hartzell BA prop and MT governor, and the prop would surge approximately 150-200 rpms about once per second under takeoff & climb power. Pretty darn interesting on a first flight. After calling Hartzell (they new about it and suggested calling Vans), Vans (the tech guy I talked to seemed a bit evasive, but gave me MTs phone#), then MT, I finally learned that any of their governors with a model # with anything earlier than an -F suffix has to be returned for modification to an -F series level. This particular governor was a -B series purchased from Vans about 16-18 months ago. Off to MT in DeLand Florida it went and was back in about 10 days- It now performs perfectly.
But- I recently visited a builder near me who had bought the same governor, but had not yet installed it. I asked to see it and it is a -C series unit. He had no idea that when he installed it on his plane and had the surging problem he would have to pull it for modification as well- quite a hassle on a flying airplane, much easier to do before initial installation of course.
I sent Vans a polite e-mail asking if they were aware of this situation, and if so, were they planning to notify those who had bought these governors. No response in over a week, so I thought I'd give y'all a little heads-up so you can avoid the same hassle I had. If you have one of these units, contact Juergen at: http://www.mt-propellerusa.com/home.htm
Mark Phillips, RV-6A "Mojo" [email protected]
Columbia, TN
http://websites.expercraft.com/n51pw/
I recently test flighted a new RV with an Aerosport IO-360, Hartzell BA prop and MT governor, and the prop would surge approximately 150-200 rpms about once per second under takeoff & climb power. Pretty darn interesting on a first flight. After calling Hartzell (they new about it and suggested calling Vans), Vans (the tech guy I talked to seemed a bit evasive, but gave me MTs phone#), then MT, I finally learned that any of their governors with a model # with anything earlier than an -F suffix has to be returned for modification to an -F series level. This particular governor was a -B series purchased from Vans about 16-18 months ago. Off to MT in DeLand Florida it went and was back in about 10 days- It now performs perfectly.
But- I recently visited a builder near me who had bought the same governor, but had not yet installed it. I asked to see it and it is a -C series unit. He had no idea that when he installed it on his plane and had the surging problem he would have to pull it for modification as well- quite a hassle on a flying airplane, much easier to do before initial installation of course.
I sent Vans a polite e-mail asking if they were aware of this situation, and if so, were they planning to notify those who had bought these governors. No response in over a week, so I thought I'd give y'all a little heads-up so you can avoid the same hassle I had. If you have one of these units, contact Juergen at: http://www.mt-propellerusa.com/home.htm
Mark Phillips, RV-6A "Mojo" [email protected]
Columbia, TN
http://websites.expercraft.com/n51pw/