I have been informed that my HSI is precessing fairly rapidly. I'll
check it out in the air soon (plane is in annual). It's a Century
NSD-360A non-slaved unit. A refurbished unit will cost about $2700. Does
anyone have any recommendations for a replacement? The Sandel SN3500
looks nice, but expensive. The airplane is a 1974 Cessna Cardinal RG.
I'm about to start IFR flight training so this is fairly important..

When my HSI needed an overhaul last year I put in a Sandel 3500 instead.
It is expensive, but it gives you so much information that once you get
used to it you won't want to fly an airplane without one.

--
Ken Reed
M20M, N9124X