rotate 180° and again indicate the magnetic bearing to
Distance range (ADF) - Check as follows:
Mode selector switch - ADF.
Tune control - Tune stations to
determine operating range of
direction finder. End of effective
operating range may be considered
to be reached when the RMI bearing
needle falls to return to within three
degrees of starting bearing
when loop is slewed first clockwise
and then counterclockwise.
Marker beacon/glideslope receiver
- Check as follows.
Marker beacon volume control (pedestal extension) -
Rotate rotate full clockwise.
NAV A control (pilot's audio control panel) - Push on
and turn clockwise to adjust volume. Clear audio
signals should be available.
Marker beacon sensitivity switch (pedestal extension) -
Frequency selectors (VOR control panel) - Select