Ovation 2 GX - Cover above panel removal

[dvk]

Hello everyone,

I'm trying to diagnose an issue in the transducer of my AP, in a G1000 Ovation 2 Mooney.

It looks like there is very easy to access to this component if the piece that "covers" the panel is removed -- I mean, the part that is on top of the G1000 screens, below the windshield.

I saw that it has two screws on the sides, and one for a cover behind the compass. Is that all? Any technique to be able to remove it?

Thanks!

[Fly Boomer]

9 hours ago, dvk said:

Hello everyone,

I'm trying to diagnose an issue in the transducer of my AP, in a G1000 Ovation 2 Mooney.

It looks like there is very easy to access to this component if the piece that "covers" the panel is removed -- I mean, the part that is on top of the G1000 screens, below the windshield.

I saw that it has two screws on the sides, and one for a cover behind the compass. Is that all? Any technique to be able to remove it?

Thanks!

Sounds like you are describing the glare shield -- at least that is the common term.  I am not sure what it is called in the Illustrated Parts Catalog.  I think Mooney changed the attachment over the years, so wait for someone with the same model as yours to answer this.

[PT20J]

[dvk]

4 hours ago, Fly Boomer said:

Sounds like you are describing the glare shield -- at least that is the common term.  I am not sure what it is called in the Illustrated Parts Catalog.  I think Mooney changed the attachment over the years, so wait for someone with the same model as yours to answer this.

Thanks a lot. Yes, it sounds like a reasonable name. And yes, it changed a lot over models.

[dvk]

16 minutes ago, PT20J said:

Thank you very much. That's very useful. It looks like it is not very difficult to fully remove it.

The version of that piece (2) in our Ovation 2 GX looks like it's only one piece, in contrast with the illustration where it looks like can be divided in two for removal.

Edited March 25, 2023 by dvk

[dvk]

UPDATE: we were able to remove the glare shield without too much difficulty.

Then, to reach the AP transducer, that is our goal, we had to remove the annunciator panel, which was more or less easy.

Finally, we got to see the AP transducer and the tubing that we want to replace, since it looks like it's giving incorrect information to the AP. The tubing looks a bit damaged, so it might be the case that is the cause of the problem.

But... we were unable to access the transducer from there. There are a couple of holes in the annunciator tray that allow some access, but not enough to be able to remove this tubing. In the other hand, it looks difficult to remove the transducer itself to make the connection outside (it has two nuts, the one above seems easy to remove, the one below looks difficult).

Any advice?

 

[carusoam]

@dvk

Which AP did you get with your G1000?

I have the older BK KAP150… where it’s altitude sensor is inside the AP box, connected to the static system….

 

Many times around here… the tube that connects the AP to the static system is a rubber tube… that doesn’t age very well… it only goes 20 or 30 years before it cracks…

So, be on the look out for what is connecting the AP control head to the static system…

If it is a sensor issue… it may be Taking the AP box out for service…

If you have a a Garmin AP,  find Trek… he can give good insight about the sensor and it’s location inside the box… 

PP thoughts only, not a mechanic… or instrument guru…

Best regards,

-a-

[dvk]

Thanks a lot @carusoam.

We have the S-TEC 55. It has a main box, and then the transducer, that is a separate component. There is three-wire connection between them.

The transducer receives the static system from a T just before the connection to the backup airspeed indicator. And yes, and you say, it uses a rubber tube for the final connection to the transducer. It looks aged, the airplane is from 2005, so close to 20 years.

So we want to change it. The problem is that it is difficult to reach the transducer. Trying to find tools that will allow us to cut the current wire that fixes the rubber tube to the transducer, and then be able to "remotely" connect the new rubber tube.

Of course, any advice is highly welcome.

Edited April 2, 2023 by dvk

[carusoam]

On 4/2/2023 at 9:47 AM, dvk said:

Thanks a lot @carusoam.

We have the S-TEC 55. It has a main box, and then the transducer, that is a separate component. There is three-wire connection between them.

The transducer receives the static system from a T just before the connection to the backup airspeed indicator. And yes, and you say, it uses a rubber tube for the final connection to the transducer. It looks aged, the airplane is from 2005, so close to 20 years.

So we want to change it. The problem is that it is difficult to reach the transducer. Trying to find tools that will allow us to cut the current wire that fixes the rubber tube to the transducer, and then be able to "remotely" connect the new rubber tube.

Of course, any advice is highly welcome.

Let’s see if @M20Doc is cruising by…. (Rubber hose connected to STec 55 replacement, challenge installing the hose in an O2)

Best regards,

-a-

[dvk]

We finally were able to change the tubing. But no luck, the AP still is trying to "hunt" the altitude.

It looks like the problem might be the transducer itself. We are also noticing that when the AP is activated in the ALT+VS mode, it begin displaying a weird FPS value, like -13 or -14 when the plan is climing at 200 FPM.

Any advice, as always, is welcomed!