Quantcast Refresher - P-12820112

 

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T-45C TS INav-04; ADV INav-02
Components and Characteristics of the Instrument Landing System (ILS)
REFRESHER
Recall:
*
Components of an ILS approach ground equipment
PRESENTATION
Instrument Landing System (ILS)
NOTE: The ILS information approach system is made up of three functional
components; the guidance systems, range systems, and the visual systems.
This lesson discusses each of the systems in detail.
I.
Guidance Systems 2.9.4.6.5, 2.9.4.6.5.1, 2.9.4.6.5.2
NOTE: The guidance system of the ILS is made up of two parts, the
localizer transmitter (azimuth information) and the glideslope transmitter
(glidepath information).
A. Localizer - azimuth beacon transmitter
Sg 1, fr 3
Fig 1: FAA Instrument
Landing System (ILS)
1. The localizer is the first half of the ILS guidance system
2. Provides precise horizontal (course) guidance information to the
runway centerline by way of a localized navigational beacon to
localizer equipped aircraft within the sensing area of the localizer
beacon signal
3. Localizer frequency is identified by international Morse code
consisting of a four letter identifier with the first letter of the
sequence beginning with the letter “I” (..)
4. Transmitter operates on one of 40 channels specifically set aside
for ILS/LOC
Sg 1, fr 4
Fig 2: Localizer Transmitter
Signal Acquisition Limits
5. Frequency range of 108.10 to 111.95 MHz (lower end of the VOR
frequency range)
6. Beacon beam is 5 degrees wide as seen on cockpit instruments
and is approximately 4 times as sensitive as conventional VOR or
TACAN NAV signals
7. Beam is produced by two overlapping modulated frequencies
a. Left side of inbound course is a 90 Hz signal and the right side
is a 150 Hz signal
(2-02) Original
Page 4-3


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