Components and Characteristics of the Instrument Landing System (ILS)
T-45A UJPT & E2-C2 INav-04
CAUTION: Do not taxi beyond the ILS Critical Area
Fig 7: Marker Beacon
Hold Short markers on the taxiways when the
instrument runway is active for ILS approaches
without tower/ground control clearance. Positioning
your aircraft beyond the markers during an approach
guidance beacons. See Figure 8.
At fields where no authority exists, such as a tower or
ground control, remain behind the critical area hold
short line if an approach is known to be in progress.
CAUTION: Remember that invalid (phantom)
glideslope signals can be inadvertently projected in
the area of the glideslope beam and in an area behind
Do not accept a glideslope indication as valid when
you are not on a published portion of the approach
and at an altitude and position where you anticipate
intercepting the glideslope.
V. Inoperative ILS components
A. Inoperative localizer: When the localizer fails, an ILS approach is not
B. Inoperative glideslope: When the glideslope fails, the ILS reverts to a
non-precision localizer approach.
NOTE: If the glideslope is inoperative, higher minimums will apply to
the approach. See the appropriate approach plate for the higher