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|  T-45C TS INav-02
Introduction to INav and Voice Procedures
(2) Point of equal overlap is the center of the
Sg 20, fr 16
extended centerline of the runway
ILS Localizer Beam
indicating on course
Pattern (0 - 10 nm)
g.
Shielded localizer array (antenna) is normally
located 1,000 ft beyond downwind end of the
runway centerline
(1) Actual signal generated by transmitter from
a building that is offset a minimum of 250 ft
from center of antenna array
(2) Optimum signal strength and minimum
possible signal interference dictate
placement of transmitter
h.
Primary approach path of a localizer approach
is called “Front Course.” It provides course
guidance for the glideslope descent path:
NOTE: Localizer front course beam is adjusted
at the antenna array for a 700 ft width at the
runway threshold. The beam as displayed on
the a/c instruments has a width of 5 degrees
allowing for 2 1/2 degrees left full deflection and
2 1/2 degrees right full deflection. A full
deflection of the CDI at runway threshold would
place the aircraft 350 ft left or right of the
runway centerline while tracking on the
localizer.
(1) 18 nm from the antenna
(2) Between 1,000 ft above the highest terrain
along course line and 4,500 ft above
antenna elevation site
(3) Signal acquisition and off-course indications
are provided through angular areas of the
operational service volume
(a) To 10 degrees either side of the course
along a radius of 18 nm from the antenna
Page 2-29
(2-02) Original
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