Does anyone have access to "King 525A HSI - Maintenance & Overhaul manual"
?
There's something I need from there.

Our HSI's glideslope is faulty; it idicates we're too low and has
inconsistent behaviour in general. After two test ILS approaches we found it
was with the avionics (not the ground station).

We removed KX 165 COM/NAV1, checked it and it is right on the numbers (the
avionics guy said).

We now removed the HSI unit and it's on the bench ...

Kyprianos Biris