NSD 360a Issues

[Cyril Gibb]

My HSI compass card started spinning in IMC which I found to be really annoying.  The cost of an Aspen is WAY beyond my reach, and I already know about throwing good money after bad so no lectures please.

Before taking Gladys to the avionics shop I thought I'd pick whatever brains are out there.  The symptoms begin with the slaving being erratic, perhaps 5 degrees drift over 30 seconds, then it gets worse quickly with the compass card rotating completely about half a rotation per second.  It stops when I pull the slaving breaker.  Free or slaved mode makes no difference.

I tried resetting the breaker every 15 minutes or so and it eventually works again.  Everything else on the HSI continues to work fine (CDI, heading bug, etc).

Is there a debugging flowchart available anywhere to try to narrow down the problem betore just sending it out for a rebuild?  I don't want to find out afterward that it was an intermittent wiring issue.

[kevinw]

I had a similar issue with mine and replaced it with a used one the shop had sitting around for about $600 plus labor. I was told that when I picked it up that I was on borrowed time with the used one and to start thinking about an Aspen. He said this particular HSI is a "problem child". I went about a year on the second one with no problems but still put the Aspen in. If I recall he said it's about 8 AMUs to rebuild one of these so clearly not worth it if that is true. If you don't want to put an Aspen in I would just find a used one and hope for the best.

[StevenL757]

Cyril - I'd hope that if you decided to go for a rebuild that you'd leverage the $6k and opt for an Aspen instead.  I'd personally suggest a G500, but appreciate budget is what it is.  :-)

Given Kevin's experiences, it sounds like your only recourse - should you decide not to spend a lot of money on this - is to make Gladys happy and take her to the electronics doctor.  :-)  Let us know how you make out.

Steve

[Cyril Gibb]

Just now, StevenL757 said:

Cyril - I'd hope that if you decided to go for a rebuild that you'd leverage the $6k and opt for an Aspen instead.  I'd personally suggest a G500, but appreciate budget is what it is.  :-)

Given Kevin's experiences, it sounds like your only recourse - should you decide not to spend a lot of money on this - is to make Gladys happy and take her to the electronics doctor.  :-)  Let us know how you make out.

Steve

I wish I could swing that, but my understanding is the cost would be close (or more) than $20k Canadian including intallation.  Not happening.  I can get a few rebuilds for that price.

 

[kevinw]

I see there is a member with some avionics posted for sale here with a NSD360 in the mix. Perhaps you could pick it up reasonably as a replacement.

Sent from my iPhone using Tapatalk

[Aerodon]

Cyril,

Post a picture of your panel please?  I'd be tempted to install a gns430 and a sandel HSI ?  They are really good value for money, add a nice moving map with all the airspace boundaries, and a bunch of other features.  The footprint is the same as the nsd360, saving a lot on installation costs.

But I looked at other m20f's, and you probably have an older audio panel and maybe no GPS?  So the scope creep starts, and before you know it you are at 15k,

 

 

 

Don