The "all in one" antenna is called a goiniometer... Dont know if the spelling is correct, but I always get good reception with the ones on the UND planes...
Not quite....a goniometer is the older style ADF indicator. The "all-in-one" antenna is just called a "combined loop". Both goniometer based and newer SIN
driven ADF systems can use combined loops although that they are not available for all models. Other ADF systems that you typically find in airliners (older ones) have the goniometer built into the remote unit and repeat the ADF bearing on an RMI via a synchro interface.
GNS 430s are just fine and dandy, but they can't teach you how to perform an NDB approach. So I still consider an ADF essential for navigation training, and for if you are flying to an airport that has no published GPS or other approaches. (Yes they still exist)
Not to mention you can't listen to AM
stations on a GNS 430...
With respect to gyros, overhauled units can be just fine. My experience though is that you need to find a shop as close by as possible. The damage typically gets done in the shipping and handling so the closer the better.
Also, use very good packing. The bigger the better. A box 5 or 6 times the width of the gyro is not outrageous. And cushion it well with very pliable material. Shipping? First class with all as many Fragile stickers that will fit on the box. Don't let your gyro languish on a truck for a week as it makes its way to you across the country.
You may want to also ask your repair station about the bearings they use. Many US shops are using aftermarket bearings that we here in Canada consider "bogus parts". Many Canadian shops have been fighting Transport Canada for policy that would allow them to use these much cheaper bearings citing unfair advantage. But I hope they lose the fight. If your instrument shop uses these bearings, you may want to ask them to provide you with a warranty and honor it if their overhauled crap quits prematurely.
If you are experiencing failures on air driven gyros, you may also want to check the pneumatic pressure on your airplanes. Many many many airplanes run with pressure well outside (higher or lower) than prescribed. It has to be pretty much dead on to promote gyro longevity.
Do you store your gyros on a hard shelf? The act of placing a gyro on a wooden shelf can subject the unit to forces well above its design limits. Gently placing it on concrete is about 100 times worse. Line your gyro shelf with a piece of foam rubber and train your technicians to REALLY treat gyros like eggs. They don't write that on gyros just for kicks.
One last thing, have your shop begin the practice of shipping gyros with one of those impact stickers. You can even place it on the unit yourself before you ship it for overhaul. If you receive it without a sticker or if it indicates an impact...send it back.
[Edited 2004-05-02 14:18:50]