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T-45C TS INav-02
Introduction to INav and Voice Procedures
b.
An ILS Critical Area taxiway marking may also
Sg 20, fr 11
be present. When ILS is operating, aircraft and
Hold-Short Markings
vehicles may be directed to hold-short at that
line, rather than at the normal hold-short line to
assure noninterference with the ILS beams
B.
Guidance Systems
NOTE: The guidance system of the ILS is made up of
two parts, the localizer transmitter (azimuth information)
and the glideslope transmitter (glidepath information).
1.
Localizer: azimuth beacon transmitter 2.9.4.6.5.1
a.
Provides precise horizontal (course) guidance
information to the runway centerline by way of a
navigational beacon to localizer equipped
aircraft within the sensing area of the localizer
beacon signal
b.
Localizer frequency is identified by international
Sg 20, fr 12
Morse code consisting of a four letter identifier
ILS Localizer
with the first letter of the sequence beginning
(Plan View)
with the letter “I” (..)
c.
Transmitter operates on one of 48 channels
Sg 20, fr 13
specifically set aside for ILS/LOC
ILS Localizer Beam
Pattern (Plan View)
d.
Frequency range of 108.10 to 111.95 MHz
(lower end of the VOR frequency range)
Sg 20, fr 14
e.
Beacon beam is 5 degrees wide as seen on
ILS Localizer Beam
cockpit instruments and is approximately 4
Pattern (Side View)
times as sensitive as conventional VOR or
TACAN NAV signals
Sg 20, fr 15
ILS Localizer Beam
f.
Beam is produced by two overlapping modulated
Pattern (10 - 18 nm)
frequencies
(1) Left side of inbound course is a 90 Hz
signal and the right side is a 150 Hz signal
Page 2-28
(2-02) Original


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