MT P860-3 Prop Gov fail.

[CharlieWaffles]

The arm is only needed for the quadrant. The arm allows you to use the full range in the quadrant. If you are using the Vernier controls, there isn't a race for the control to move in and look awkward - so no need.

[jwilbur]

Originally Posted by CharlieWaffles

The arm is only needed for the quadrant. The arm allows you to use the full range in the quadrant. If you are using the Vernier controls, there isn't a race for the control to move in and look awkward - so no need.

Very good. Thank you, Mark.

[N402RH]

After about 5 hours of work I actually got it installed and working with the standard arm. This is what I had to do to install it:

1. With the existing washer, lock washer and nut I found the case studs were too short. I ended up using only the lock washer and nut and the stud is flush with the top of the nut. I will order new longer studs from Lycoming and change them next time I change the oil.

2. After loosening the nut holding the standard arm and re clocking it to the correct orientation I found the rod end would interfere with the travel stops. The Hartzell instructions say that you can loosen the cap screws and only rotate it withing the slot. After a lot of frustration and a visit to CharlieWaffles RV-10 I ignored the instructions and removed all the cap screws and rotated that cap assembly about 100 degrees. With the stop assembly now located in the back (like the MT) I was able to get it to work without any interference.

3. I then had to do a lot of trimming on the baffle assembly so that it would mount around the larger governor.

4. I then had to do a lot of trimming on the upper cowl fiberglass to get it to fit around the new governor.

It would be nice if the Hartzell governor purchased from Van's for an RV-10 came with the longer arm and was already clocked at the correct location. I suspect that the Van's tech support people are going to get a lot of calls.

Rob Hickman
N402RH RV-10

[rleffler]

Originally Posted by N402RH

After It would be nice if the Hartzell governor purchased from Van's for an RV-10 came with the longer arm and was already clocked at the correct location. I suspect that the Van's tech support people are going to get a lot of calls.

Rob Hickman
N402RH RV-10

It was brought to their attention at least four years ago when they started shipping the Hartzell governors.

Like the ring gear change causing alternator alignment issues, it's fallen on deaf ears. Like the alternator mount kit, this arm should be included in the FWF kit since you can't get airworthy without them.

[BobTurner]

Originally Posted by rleffler

It was brought to their attention at least four years ago when they started shipping the Hartzell governors.
Like the alternator mount kit, this arm should be included in the FWF kit since you can't get airworthy without them.

I slightly disagree. It should be included with the Quadrant kit option. As pointed out in previous posts, the arm shipped works with push-pull blue knobs. At least it did on mine, shipped fall 2009. (note 7 years ago)
Maybe a few instructions would have been nice. Like others, I stared at the thing a long time, finally contacted Hartzell, who said removing all the cap screws and rotating the top was okay if done carefully. Actual job was only a few minutes.

[BobTurner]

BTW, a post on the 'other' forum from someone who called MT in Germany says that MT has identified an issue and will be issuing a SB shortly.

[woxofswa]

My RPM at moment of PG Failure



FYI to Hartzell buyers

Van's lists their Hartzell govs incorrectly in their catalog. They list them as for "IO" or "O". According to Hartzell, there is no difference on fuel delivery. The correct listing should be for narrow deck or wide deck.

Rob,

Our meatball field mods to get back flying had us cutting the upper cowl opening enlargement with the saw blade of a Leatherman.

[Dustyone]

I have just heard back from MT in Germany.

There is soon to be a new SB31 with expanded serial numbers to address the recent failures.

Although this will mean grounding my aircraft,cudos to MT for responding so quickly.

Letter below:

But we have another issue with the P-8XX-3 series , during operation a flyweight assembly could become loose.
In this case the damaged flyweight assembly will result in an overspeed or underspeed condition .

Shortly we will release the SB 31 because of that issues.
According this SB 31 your governor with the S/N 11G028G is affected .

This modification is free of charge.

If you have any more question , do not hesitate to contact me.


Best Regards

Andreas Seperant

Engineering / Tech Support
MT-Propeller Entwicklung GmbH
Airport Straubing-Wallmuehle
D-94348 Atting - GERMANY
phone: +49( 0 )9429-9409-44
fax: +49( 0 )9429 - 8432
www.mt-propeller.com

[woxofswa]

In looking more closely at my recorder data on www.savvyanalysis.com,there is something that stands out to me.

Prior to my PG failure, there were four momentary upward spikes in my RPM of approx 150RPM each. There were none on the previous segment of the flight, nor on the previous flight.

The first one happened 17 minutes prior to the failure. They are just blips with no duration at the peak. I honestly didn't notice them in the flight.
I am not expert on any of this stuff, and just started with the software, but, If I were to be in a situation where I was going to fly with one of these PG's, I would set my max RPM alert to 100 rpm higher than what I planned to use at cruise. (I normally cruise at 2300 below 10K and 2400 above).

One could do it prior to flight and just deal with the alert on takeoff, or reset the alert level once established in cruise. At any rate, it could give an alert that something is potentially wrong and give more time to GYAOTG

[N402RH]

Originally Posted by N402RH

After about 5 hours of work I actually got it installed and working with the standard arm. This is what I had to do to install it:

1. With the existing washer, lock washer and nut I found the case studs were too short. I ended up using only the lock washer and nut and the stud is flush with the top of the nut. I will order new longer studs from Lycoming and change them next time I change the oil.

2. After loosening the nut holding the standard arm and re clocking it to the correct orientation I found the rod end would interfere with the travel stops. The Hartzell instructions say that you can loosen the cap screws and only rotate it withing the slot. After a lot of frustration and a visit to CharlieWaffles RV-10 I ignored the instructions and removed all the cap screws and rotated that cap assembly about 100 degrees. With the stop assembly now located in the back (like the MT) I was able to get it to work without any interference.

3. I then had to do a lot of trimming on the baffle assembly so that it would mount around the larger governor.

4. I then had to do a lot of trimming on the upper cowl fiberglass to get it to fit around the new governor.

It would be nice if the Hartzell governor purchased from Van's for an RV-10 came with the longer arm and was already clocked at the correct location. I suspect that the Van's tech support people are going to get a lot of calls.

Rob Hickman
N402RH RV-10

Update on my Hartzell Governor change:

Van's sells two different Hartzell governors for the Lycoming 540 engine, listed as one for the IO-540 and one for the O-540. This is not correct! They should be listed as one for the wide deck engine and one for the narrow deck engine.

The Van's Hartzell IO-540 governor should be labeled Wide deck 540 and the O-540 should be labeled narrow deck 540.

The good news is that after installing my second Hartzell governor in 24 hours it worked perfect. The prop RPM on takeoff was 2700 with the factory adjustment and cruise RPM is very stable. I have about 3 hours on the new governor and it looks like the Hartzell governor does a better job of holding RPM.

Rob Hickman
N402RH RV-10