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
Test and Illumination
instrument runway is active for ILS approaches
Controls
without tower/ground control clearance. Positioning
your aircraft beyond the markers during an approach
could disrupt and affect the reliability of the ILS
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
the antenna (back course).
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
authorized
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
minimums.
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(6-99) Original
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