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Simrad A20 Issue

Old 07-27-2013, 04:26 PM
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Default Simrad A20 Issue

Hey everyone,
So I recently had a bad hydraulic leak from a rear helm station. Fixed the issue and everything is working fine...except...

Now my autopilot isn't working correctly. It veers to one direction or the other and doesn't correct. Then the off course warning starts up. Any ideas as to what this could be and how I can alleviate it?

Thanks in advance for any help!

-Tom
Old 07-27-2013, 08:47 PM
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A few non-expert suggestions/ questions (FWIW I do have and use a couple AP 20's and 1 AP 21 though) :

Did you perform the full Sea Trial procedure after the leak fix including full & correct heading sensor Compass Calibration?

Any ferrous tools or equipment or eneregized electrical wires added ( or removed) from the vicinity of the fluxgate or rate compass since the system worked properly?

Was the system sufficiently purged of air for very normal steering?

Does it do it only in Auto mode using the heading sensor , or also when in Nav mode using crosstrack correction feedback to a GPS WP to which you are navigating?

When in Standby with 2nd click on Standby button and you turn the wheel slowly to P & S from 0 position, does the rudder feedback displayed rudder angle increase and decrease with sequential degrees to indicate the RFU is sensing properly with no blank spots?
Old 07-29-2013, 05:24 AM
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Originally Posted by TTaxi View Post
A few non-expert suggestions/ questions (FWIW I do have and use a couple AP 20's and 1 AP 21 though) :

Did you perform the full Sea Trial procedure after the leak fix including full & correct heading sensor Compass Calibration?

Any ferrous tools or equipment or eneregized electrical wires added ( or removed) from the vicinity of the fluxgate or rate compass since the system worked properly?

Was the system sufficiently purged of air for very normal steering?

Does it do it only in Auto mode using the heading sensor , or also when in Nav mode using crosstrack correction feedback to a GPS WP to which you are navigating?

When in Standby with 2nd click on Standby button and you turn the wheel slowly to P & S from 0 position, does the rudder feedback displayed rudder angle increase and decrease with sequential degrees to indicate the RFU is sensing properly with no blank spots?
Thanks for the response.

I didn't do the full sea trial yet. I didn't even think it could be an internal compass issue, i'll be sure to do that next time i'm out.

We did purge the air out of the system.

It does in in auto and Nav mode.

The rudder dispay is working correctly when I had checked it.

I think i'll try the seatrial and take it from there. Hopefully that's all it is!

-Tom
Old 08-02-2013, 05:40 AM
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Update: I fixed the issue. There is a hydraulic flow controller (looks like a knife switch) in the engine room (had no idea what this thing was and I can't reach the previous owner to ask him questions) that must have gotten moved to "0" from the normal "2." Luckikly that was all it was.
Thanks again for the help along the way that helped me narrow down what it wasn't.
-Tom
Old 08-02-2013, 12:09 PM
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Interesting way of putting it.

Glad to hear you have it all relatively painlessly squared away in spite of my attempt to help, heh.

FWIW, I don't have any external valving like that on my system.

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