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7.2.5.1To 10 either side of the course along a radius
of 18 NM from the antenna.
7.2.5.2From 10 to 35either side of the course
along a radius of 10 NM. (See FIG ENR 4.1−1.)
7.2.6Unreliable signals may be received outside
these areas.
FIG ENR 4.1−1
Limits of Localizer Coverage
7.3Localizer−Type Directional Aid
7.3.1The localizer−type directional aid (LDA) is of
comparable use and accuracy to a localizer but is not
part of a complete ILS. The LDA course usually
provides a more precise approach course than the
similar Simplified Directional Facility (SDF) installation,
which may have a course width of 6 degrees or
12 degrees.
7.3.2The LDA is not aligned with the runway.
Straight−in minimums may be published where
alignment does not exceed 30 degrees between the
course and runway. Circling minimums only are
published where this alignment exceeds 30 degrees.
7.3.3A very limited number of LDA approaches
also incorporate a glideslope. These are annotated in
the plan view of the instrument approach chart with
a note, LDA/Glideslope." These procedures fall
under a newly defined category of approaches called
Approach with Vertical Guidance (APV) described in
Section ENR 1.5, paragraph 12, Instrument Approach
Procedure Charts, subparagraph 12.1.7.2,
Approach with Vertical Guidance (APV). LDA
minima for with and without glideslope is provided
and annotated on the minima lines of the approach
chart as S−LDA/GS and S−LDA. Because the final
approach course is not aligned with the runway
centerline, additional maneuvering will be required
compared to an ILS approach.
7.4Glide Slope/Glide Path
7.4.1The UHF glide slope transmitter, operating on
one of the 40 ILS channels within the frequency range
329.15 MHz, to 335.00 MHz radiates its signals in the
direction of the localizer front course.
CAUTION−
False glide slope signals may exist in the area of the
localizer back course approach which can cause the glide
slope flag alarm to disappear and present unreliable glide
slope information. Disregard all glide slope signal
indications when making a localizer back course
approach unless a glide slope is specified on the approach
and landing chart.
7.4.2The glide slope transmitter is located between
750 and 1,250 feet from the approach end of the
runway (down the runway) and offset 250−600 feet
from the runway centerline. It transmits a glide path
beam 1.4 degrees wide (vertically).
NOTE−
The term glide path" means that portion of the glide slope
that intersects the localizer.
7.4.3The glide path projection angle is normally
adjusted to 3 degrees above horizontal so that it
intersects the middle marker at about 200 feet and the
outer marker at about 1,400 feet above the runway
elevation. The glide slope is normally usable to the
distance of 10 NM. However, at some locations, the
ENR 4.1−6 AIP
15 MAR 07 United States of America
Nineteenth Edition Federal Aviation Administration
glide slope has been certified for an extended service
volume which exceeds 10 NM.
7.4.4Pilots must be alert when approaching
glidepath interception. False courses and reverse
sensing will occur at angles considerably greater than
the published path.
7.4.5Make every effort to remain on the indicated
glide path. Exercise caution: avoid flying below the
glide path to assure obstacle/terrain clearance is
maintained.
REFERENCE−
14 CFR Section 91.129(e).
7.4.6A glide slope facility provides descent
information for navigation down to the lowest
authorized decision height (DH) specified in the
approved ILS approach procedure. The glidepath
may not be suitable for navigation below the lowest
authorized DH and any reference to glidepath
indications below that height must be supplemented
by visual reference to the runway environment. Glide
slopes with no published DH are usable to runway
threshold.
7.4.7The published glide slope threshold crossing
height (TCH) DOES NOT represent the height of the
actual glide slope on course indication above the
runway threshold. It is used as a reference for
planning purposes which represents the height above
the runway threshold that an aircraft’s glide slope
antenna should be, if that aircraft remains on a
trajectory formed by the four−mile−to−middle
marker glidepath segment.
7.4.8Pilots must be aware of the vertical height
between the aircraft’s glide slope antenna and the
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