h. Repeat entire procedure for remaining voice security sets
*19. Gyromagnetic compass sets (KCS 305 and KCS 55A) - Check
FREE/SLAVE switches - As desired.
All operable aircraft systems shall be in normal operation.
Operate aircraft on four headings approximately 90° apart
over known ground references.
Verify the following:
HSI and RMI headings agree with the known
heading within + 4 degrees.
HSI headings agree within + 2 degrees.
RMI headings agree K20 within ± 2
*20. ADF radio set (KDF 806) - Check as follows:
a. NAV B switch (audio control panel - ON).