Per a 1968 Navomatic 400 repair manual:
Computer-Amplifier part number 30520-0014 (14 volt) or 30520-0028 (28 volt)
Control Unit [dial unit on the pedestal] 30510-1114 (14V) or 30510-1128 (28V)
Gyro-Attitude Indicator 30475-0100 (Type G-519A)
Directional Gyro 30370-0100 (Type G 520A)
Above for an "AF-520A".
Herb's pictures for "AF-520 B&C".
Hope this helps some. I see a firm called AQI that sells them and overhauls. Maybe there are others...
Last edited by wslade2 : 01-25-21 at 01:06 AM.
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