Verify that clear audio signals are
Tuning knobs (VOR control panel) -
Select localizer frequency.
switch (display controller) - Depress to
select ILS1 or ILS2 navigation source
annunciator on respective HS1.
Glideslope indicator (EADI and EHSI) -
Read glideslope indications.
Fly an ILS approach monitoring localizer
and glideslope indications and marker
beacon indicator lights and audio tone
for proper function.
Each localizer and glideslope receiver
shall provide positive indications with no
oscillations occurring from the outer
marker to the approach end of the
Verify that marker beacon can be
received for a distance of not less than
one mile, when in horizontal flight over
the ground station cone of silence
marker at 10,000 feet above ground
Check marker beacon sensitivity switch
function as follows: