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T-45C TS INav-04; ADV INav-02
Components and Characteristics of the Instrument Landing System (ILS)
B. Glideslope - glideslope beam transmitter
Sg 2, fr 2
Fig 1: FAA Instrument
1. Glideslope is the second half of the ILS approach guidance
Landing System (ILS)
equipment
a. Provides vertical guidance when approach is equipped
b. Reclassifies the localizer non-precision approach to precision
ILS approach
c.
When aircraft is ILS equipped, provides option of precision
approach to a field with no PAR facility
NOTE: Glideslope is often confused with the term “Glidepath.”
Sg 2, fr 3
These terms are not synonymous. It is important that you
Glideslope/Glidepath
clearly understand the definition of these two terms.
Glideslope: “The vertical reference provided an aircraft during
approach and landing. The glideslope reference may be any of
the following: an electronic signal (ILS or MLS), visual ground
aid (such as VASI) or glideslope information provided by ATC
during a surveillance approach.”
Glidepath: “That portion of the glideslope reference signal that
intersects the localizer on an ILS approach or is provided by
ATC when established on the FAC during a PAR approach.”
d. The glideslope (highly directional shielded antenna) signal is
radiated in the direction of the localizer front course
Sg 2, fr 4-5
Glideslope Antenna
(1) Located 750 to 1,250 ft down the designated ILS runway
(2) Beam width is 55 ft (+/- 5 ft) at runway threshold crossing
height
(3) Building location is normally located 250 to 600 ft from
runway centerline
(4) Standard ILS glideslope is normally 2.5 to 3.0 degrees (may
be higher depending on local terrain)
(5) Glideslope utilizes two signal lobes projected one above the
Sg 2, fr 6-7
other. Upper lobe is modulated with 90 Hz and the lower
Glideslope Signal Lobes
lobe at 150 Hz at an equal signal strength
(6) Each lobe is approximately 0.7 degrees wide with a total
beam width of approximately 1.4 degrees wide
(7) The point of equal signal modulation sets the center of the
glideslope beam
Page 4-7
(2-02) Original


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