|
|
I am not sure about the King, I think it requires an external compass as well. For the Sandel, the external compass source can be a remote compass system (what I have in the tail of the plane), or it can be a separate DG or HSI (vacuum or electric) with bootstrap output. But the broken EDO-Aire (Cessna) HSI that came out of the panel when the Sandel went in was a vacuum instrument.
In my opinion, the Sandel HSI with a remote gyro is more reliable than the vacuum HSI which broke. The overhaul shop wanted $2500 to repair/overhaul the old HSI. They said that all the bearings, flags and needles were sticking, and the belt which moves the compass card was worn. All the problems were associated with moving parts, and there were a lot of them in there. The Sandel has only one moving part (the cooling fan). The remote compass system which supplies heading information to the Sandel also has only one moving part (the gyro).
Of course, if I have a total electrical failure, all I have left is the wet compass, attitude indicator and altimeter. I can accept that.
I wrote:
Advantages:
No vacuum required
John Kleber answered:
I didn't realize vaccuum was required for the King HSI........
Marc Clemente
|
|