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T-45C TS INav-02
Introduction to INav and Voice Procedures
System [MLS]), visual ground aid (such as
VASI) or glideslope information provided by
ATC during a precision approach (PAR).
Glidepath: The portion of the glideslope signal
Sg 20, fr 19
that intersects the localizer on an ILS approach
Glideslope Lobes
or the descent guidance provided by ATC when
established on the Final Approach Course
(FAC) during a PAR approach.
d.
The glideslope (highly directional shielded
antenna) signal is radiated in the direction of
the localizer front course
(1) Located 750 to 1,250 ft down the designated
Sg 20, fr 20
ILS runway from approach end
Glideslope Lobe Size
(2) Beam width is 55 ft (+/- 5 ft) at runway
threshold crossing height
(3) Building location is normally 250 to 600 ft
from runway centerline
(4) Standard ILS glideslope is 2.5 to 3.0 degrees
Sg 20, fr 21
(may be higher or lower depending on local
3-Degree Glideslope
terrain)
(5) Glideslope utilizes two signal lobes projected
one above the other. Upper lobe is modulated
with 90 Hz and the lower 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
NOTE: Glidepaths with no published
Decision Altitude (DA)/Decision Height (DH)
are usable to runway threshold; however,
pilots of T-45C aircraft will execute a missed
Page 2-31
(2-02) Original


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